阅读说明：本技术 锅体、锅体的加工方法及烹饪器具 (Pot body, processing method of pot body and cooking utensil ) 是由 张明 金伟平 瞿义生 于 2018-09-12 设计创作，主要内容包括：本发明公开了一种锅体,包括：金属基体,包括位于所述锅体内壁处的铁基材；以及防锈层,位于所述铁基材表面,其包括铁层以及金属活性高于铁层的活性金属层,且至少部分所述铁层和部分所述活性金属层混合形成所述锅体的内表面。本发明还公开了一种包括上述锅体的烹饪器具。此外,本发明还公开了一种锅体的加工方法,包括步骤：制得锅坯,所述锅坯内壁的基材为铁基材；以及在所述锅坯内壁形成防锈层,所述防锈层包括铁层和活性金属层,且至少部分所述铁层和部分所述活性金属层混合形成所述锅体的内表面。本发明的锅体,通过形成阴极保护,保护锅体不被腐蚀。(The invention discloses a pot body, which comprises: the metal matrix comprises an iron matrix positioned on the inner wall of the pot body; and the anti-rust layer is positioned on the surface of the iron base material and comprises an iron layer and an active metal layer with metal activity higher than that of the iron layer, and at least part of the iron layer and part of the active metal layer are mixed to form the inner surface of the pot body. The invention also discloses a cooking appliance comprising the pot body. In addition, the invention also discloses a processing method of the pot body, which comprises the following steps: preparing a pot blank, wherein the base material on the inner wall of the pot blank is an iron base material; and forming an anti-rust layer on the inner wall of the pot blank, wherein the anti-rust layer comprises an iron layer and an active metal layer, and at least part of the iron layer and part of the active metal layer are mixed to form the inner surface of the pot body. The pot body of the invention protects the pot body from being corroded by forming cathode protection.)

1. A pan body (100), comprising:

a metal base (110) comprising an iron base located at an inner wall of the pan body (100); and

and the anti-rust layer is positioned on the surface of the iron base material and comprises an iron layer (120) and an active metal layer (130) with metal activity higher than that of the iron layer (120), and at least part of the iron layer (120) and part of the active metal layer (130) are mixed to form the inner surface of the pot body (110).

2. The pan body (100) of claim 1, wherein:

the iron layer (120) is covered on the iron base material of the metal base body (110), and the active metal layer (130) is formed on the iron layer (120);

the iron layer (120) is provided with a plurality of protruding units, and at least part of the protruding units are exposed out of the active metal layer (130).

3. The pan body (100) of claim 1, wherein:

the active metal layer (130) is covered on the iron substrate of the metal matrix (110), and the iron layer (120) is formed on the active metal layer (130);

the active metal layer (130) is provided with a plurality of protruding units, and at least part of the protruding units are exposed out of the iron layer (120).

4. The pan body (100) of claim 1, wherein:

the surface of the iron base material is provided with a rough layer with a plurality of protruding units, the rough layer is the iron layer (120), the active metal layer (130) is formed on the rough layer, and at least part of the protruding units are exposed out of the active metal layer (130).

5. The pan body (100) of any one of claims 1 to 4, wherein:

the active metal layer (130) is one or more of an aluminum layer, an aluminum alloy layer, a magnesium alloy layer, a zinc layer or a zinc alloy layer;

more preferably, the area ratio of the iron layer (120) and the active metal layer (130) forming the inner surface of the pot body (100) is A, wherein A is more than or equal to 0.1 and less than or equal to 10.

6. A cooking appliance, wherein: comprising a pan (100) according to any one of claims 1 to 5.

7. A processing method of a pot body (100) comprises the following steps:

s1: preparing a pot blank, wherein the base material on the inner wall of the pot blank is an iron base material; and

s2: and forming an anti-rust layer on the inner wall of the pot blank, wherein the anti-rust layer comprises an iron layer (120) and an active metal layer (130), and at least part of the iron layer (120) and part of the active metal layer (130) are mixed to form the inner surface of the pot body (110).

8. The processing method of pot (100) as claimed in claim 7, wherein said step S2 comprises:

SA 21: forming an iron layer (120) with protrusions on the inner wall of the pot blank through thermal spraying;

SA 22: forming an active metal layer (130) on the iron layer (120) by thermal spraying; and

SA 23: and performing alkali washing on the surface of the active metal layer (130) so that part of the iron layer (120) is exposed out of the active metal layer (130).

9. The processing method of pot (100) as claimed in claim 7, wherein said step S2 comprises:

SB 21: forming an active metal layer (130) with a bulge on the inner wall of the pot blank by thermal spraying;

SB 22: forming an iron layer (120) on the active metal layer (130) by thermal spraying; and

SB 23: and polishing the surface of the iron layer (120) so that part of the active metal layer (130) is exposed out of the iron layer (120).

10. The processing method of pot (100) as claimed in claim 7, wherein said step S2 comprises:

SC 21: roughening the iron base material on the inner wall of the pot blank to form a raised rough layer, wherein the rough layer is the iron layer (120);

SC 22: thermally spraying an active metal layer (130) on the roughened layer; and

SC 23: and performing alkali washing on the surface of the active metal layer (130) so that part of the rough layer is exposed out of the active metal layer (130).

Technical Field

The invention relates to the technical field of cooking appliances, in particular to a pot body and a processing method of the pot body.

Background

At present, iron products on the market generally form a nitrided layer and an oxidized layer on an iron substrate through a nitriding oxidation process in order to prevent corrosion, wherein the nitrided layer can improve the hardness, wear resistance and corrosion resistance of the products, and the oxidized layer blackens the surface of the products and provides the products with corrosion resistance. However, the adoption of the nitridation oxidation process not only has high energy consumption in the processing process, but also needs continuous heating for 6-8h at the temperature of 570-700 ℃, thereby having low processing efficiency, and the corrosion resistance of the processed product is also lower. In addition, the composite board cannot adopt a nitriding technology, so that the nitriding oxidation process has certain limitation.

Disclosure of Invention

To this end, the present invention provides a pan body to solve or at least alleviate the above existing problems.

According to one aspect of the invention, there is provided a pan body comprising: the metal matrix comprises an iron matrix positioned on the inner wall of the pot body; and the anti-rust layer is positioned on the surface of the iron base material and comprises an iron layer and an active metal layer with metal activity higher than that of the iron layer, and at least part of the iron layer and part of the active metal layer are mixed to form the inner surface of the pot body.

Optionally, in the pan body according to the invention, the iron layer covers the iron base material of the metal base, and the active metal layer is formed on the iron layer; the iron layer is provided with a plurality of protruding units, and at least part of the protruding units are exposed out of the active metal layer.

Optionally, in the pan body according to the invention, the active metal layer covers the iron substrate of the metal base, the iron layer being formed on the active metal layer; the active metal layer is provided with a plurality of protruding units, and at least part of the protruding units are exposed out of the iron layer.

Optionally, in the pot body according to the present invention, a rough layer having a plurality of protruding units is formed on a surface of the iron substrate, the rough layer is the iron layer, the active metal layer is formed on the rough layer, and at least a portion of the protruding units are exposed out of the active metal layer.

Optionally, in the pan body according to the invention, the active metal layer is one or more of an aluminum layer, an aluminum alloy layer, a magnesium alloy layer, a zinc layer or a zinc alloy layer.

Optionally, in the pan body according to the invention, the area ratio of the iron layer and the active metal layer forming the inner surface of the pan body is A, wherein A is more than or equal to 0.1 and less than or equal to 10.

According to a further aspect of the invention, a cooking appliance is provided, comprising a pot body as described above.

According to another aspect of the present invention, there is provided a method for processing a pot body, comprising the steps of:

s1: preparing a pot blank, wherein the base material on the inner wall of the pot blank is an iron base material; and

s2: and forming an anti-rust layer on the inner wall of the pot blank, wherein the anti-rust layer comprises an iron layer and an active metal layer, and at least part of the iron layer and part of the active metal layer are mixed to form the inner surface of the pot body.

Alternatively, in the processing method of the pot body according to the present invention, the step S2 includes:

SA 21: forming an iron layer with protrusions on the inner wall of the pot blank through thermal spraying;

SA 22: forming an active metal layer on the iron layer by thermal spraying; and

SA 23: and performing alkali washing on the surface of the active metal layer so that part of the iron layer is exposed out of the active metal layer.

Alternatively, in the processing method of the pot body according to the present invention, the step S2 includes:

SB 21: forming a raised active metal layer on the inner wall of the pot blank by thermal spraying;

SB 22: forming an iron layer on the active metal layer by thermal spraying; and

SB 23: and polishing the surface of the iron layer so that part of the active metal layer is exposed out of the iron layer.

Alternatively, in the processing method of the pot body according to the present invention, the step S2 includes:

SC 21: coarsening an iron base material on the inner wall of the pot blank to form a rough layer with protrusions, wherein the rough layer is the iron layer;

SC 22: forming an active metal layer on the rough layer through thermal spraying; and

SC 23: and performing alkali washing on the surface of the active metal layer so as to expose part of the rough layer out of the active metal layer.

According to the technical scheme, the pot body comprises a metal substrate and an anti-rust layer covering the surface of an iron substrate of the metal substrate, wherein the anti-rust layer comprises an iron layer and an active metal layer with metal activity higher than that of the iron layer, and part of the iron layer and part of the active metal layer are formed on the inner surface of the pot body in a mixed mode, so that cathode protection can be formed on the inner surface of the pot body, and the active metal layer can protect the iron layer from being corroded.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

To the accomplishment of the foregoing and related ends, certain illustrative aspects are described herein in connection with the following description and the annexed drawings, which are indicative of various ways in which the principles disclosed herein may be practiced, and all aspects and equivalents thereof are intended to be within the scope of the claimed subject matter. The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description read in conjunction with the accompanying drawings. Throughout this disclosure, like reference numerals generally refer to like parts or elements.

FIG. 1 shows a schematic structural view of a pan body according to a first embodiment of the invention;

FIG. 2 shows a schematic structural view of a pan body according to a second embodiment of the invention;

FIG. 3 shows a schematic structural view of a pan body according to a third embodiment of the invention;

FIG. 4 shows a schematic top view of a pan body according to an embodiment of the invention;

fig. 5 shows a schematic structural view of forming a protective film layer on a pan body according to a first embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As mentioned above, the prior art pan has more or less certain functional drawbacks, and therefore the present invention proposes a pan with more optimized performance. Fig. 1 to 5 show a schematic structural view of a pan body 100 of the present invention.

As shown in fig. 1 and 2, the pot body 100 includes a metal base 110, and the metal base 110 may be made of a single-layer steel plate, cast iron, or a composite plate material, as long as the inner surface of the metal base 110 is made of iron. Here, if the metal base 110 is made of a composite plate, it is only necessary to ensure that the inner layer of the composite plate relative to the pot body 100 is made of iron. It is understood that the metal base 110 includes an iron base located at the inner sidewall of the pan body 100. In addition, the pot body 100 further comprises an anti-rust layer 110 covering the surface of the iron substrate of the metal substrate 110, the anti-rust layer 110 comprises an iron layer 120 and an active metal layer 130, and the active metal layer 130 is composed of metal elements with higher metal activity than iron, so that the metal activity of the active metal layer 130 is higher than that of the iron layer 120. Wherein at least a portion of the iron layer 120 is exposed to the active metal layer 130, or at least a portion of the active metal layer 130 is exposed to the iron layer 120, so that at least a portion of the iron layer 120 and a portion of the active metal layer 130 are mixed with each other to form on the inner surface of the pan body 100, as shown in fig. 4. On one hand, the iron layer 120 is only partially exposed in the environment, and the exposed area is small, so that pure rust cannot be generated; on the other hand, since the metal activity of the active metal layer 130 is higher than that of the iron layer 120, the iron layer 120 is at the cathode, and the active metal layer 130 is at the anode, according to the principle of cathodic protection, the active metal layer 130 at the anode can protect the iron layer 120 at the cathode from corrosion.

Specifically, the active metal layer 130 may be one or more of active metal elements having a metal activity higher than that of iron, and may be one or more of metal elements such as magnesium, magnesium alloy, aluminum alloy, zinc, and zinc alloy.

According to the first embodiment, as shown in fig. 1, the iron layer 120 is thermally sprayed on the iron base material of the metal base 110 such that the iron layer 120 covers the iron base material of the metal base 110, and the thermally sprayed iron layer 120 has a plurality of projection units, and preferably, the plurality of projection units are uniformly distributed. The reactive metal layer 130 is then thermally sprayed on the iron layer 120. The surface of the active metal layer 130 on the upper layer is washed with alkali, so that part of the active metal layer 130 coated on the surface of the iron layer 120 is removed, and at least part of the protruding units on the iron layer 120 are exposed out of the active metal layer 130, thus, part of the iron layer 120 and part of the active metal layer 130 are distributed on the inner surface of the pot body 100 in a staggered manner to form an anti-rust layer together, so that cathode protection is formed on the inner surface of the pot body 100, and the iron layer 120 is protected from corrosion. In this embodiment, since the iron layer 120 and the active metal layer 130 are not sprayed simultaneously, but the iron layer 120 is formed by thermal spraying first and the active metal layer 130 is formed by thermal spraying on the iron layer 120, the inner surface of the pot body 100 is in a cross-mixed distribution state of the iron layer 120 and the active metal layer 130 after the alkali cleaning treatment, and the iron layer 120 and the active metal layer 130 exposed on the inner surface of the pot body 100 after the alkali cleaning are also in different distributions due to the difference in the degree of alkali cleaning, so that the iron layer 120 and the active metal layer 130 on the surface of the rust-preventive layer may be in a discontinuous or continuous state. However, the entire iron layer 120 is in a continuous state as shown in fig. 1. The entirety of the active metal layer 130 is also in a continuous state, as shown in fig. 4.

Preferably, part of the iron layer 120 and part of the active metal layer 130 are uniformly distributed on the inner surface of the pot body 100 in a staggered manner, together forming a rust-proof layer.

According to the second embodiment, as shown in fig. 2, the reactive metal layer 130 is thermally sprayed on the iron base material of the metal base 110 so that the reactive metal layer 130 covers the iron base material of the metal base 110, and the thermally sprayed reactive metal layer 130 has a plurality of convex units which are almost uniformly distributed. The iron layer 120 is then thermally sprayed on the active metal layer 130. The surface of the iron layer 120 is polished, so that part of the iron layer 120 coated on the surface of the active metal layer 130 is removed, and at least part of the protruding units on the active metal layer 130 are exposed out of the iron layer 120, thus, the iron layer 120 and the active metal layer 130 can be distributed on the inner surface of the pot body 100 in a staggered manner to form a rust-proof layer together, so that cathode protection is formed on the inner surface of the pot body 100, and the iron layer 120 is protected from corrosion. Similarly, in this embodiment, the active metal layer 130 is formed by thermal spraying, and then the iron layer 120 is formed by thermal spraying on the active metal layer 130, so that after the grinding process, the inner surface of the pan body 100 presents a distribution state in which the active metal layer 130 and the iron layer 120 are mixed and staggered, and because of different grinding degrees, the distribution of the iron layer 120 exposed on the inner surface of the pan body 100 after grinding is different from that of the active metal layer 130, the iron layer 120 and the active metal layer 130 on the surface of the rust-proof layer may be in a discontinuous or continuous state. However, the entire active metal layer 130 and the iron layer 120 are continuous, as shown in fig. 2 and 4.

According to the third embodiment, as shown in fig. 3, since the metal matrix 110 itself has an iron base material, a rough layer having a plurality of protruding units distributed almost uniformly can be formed on the surface of the iron base material by performing surface treatment on the iron base material of the metal matrix 110, so that the rough layer on the surface of the iron base material, i.e., the iron layer, can be directly thermally sprayed on the rough layer on the surface of the iron base material of the metal matrix 110 to form the active metal layer 130, and the rough layer on the iron base material and the active metal layer 130 together form a rust preventive layer. The surface of the active metal layer 130 is washed with alkali, so that part of the active metal layer 130 coated on the rough layer on the surface of the iron substrate is removed, at least part of the protruding units of the rough layer are exposed out of the active metal layer 130, and the exposed protruding units and the active metal layer 130 are distributed on the inner surface of the pot body in a staggered manner, so that cathode protection is formed, and the inner surface of the pot body 100 is protected from being corroded. It is understood that in this embodiment, the rough layer and the active metal layer 130 in the surface layer of the rust preventive layer may be in a discontinuous or continuous state due to the difference in the degree of alkali washing. However, the rough layer of the metal base 110 and the active metal layer 130 are continuous as a whole, as shown in fig. 3 and 4.

Specifically, in the above three embodiments, of the iron layer 120, the active metal layer 130 or the rough layer (i.e., iron layer) having protruding units preliminarily formed on the iron base material, the area of each protruding unit of the iron layer 120, the active metal layer 130 or the rough layer exposed to the inner surface of the pot body 100 is S, wherein 0 < S ≦ 3mm². Here, if S is larger than 3mm²The area of the single protruding unit of the iron layer 120 or the active metal layer 130 exposed to the inner surface of the pot body 100 is large, so that chemical corrosion is easily formed on the surface of the exposed part of the iron layer 120 or the active metal layer 130.

Further, as shown in fig. 1, in the above three embodiments, each protruding unit of the iron layer 120, the active metal layer 130, or the rough layer includes a peak and a trough, and assuming that the height of the peak is H, the distance between two adjacent peaks is L, where H is greater than or equal to 5um and less than or equal to 30um, and L is greater than or equal to 5um and less than or equal to 30 um. Here, if the height H of the peak and the distance L between two adjacent peaks are both less than 5um, the volume of the trough formed between two adjacent peaks is small, so that the volume of the active metal layer 130 or the iron layer 120 finally deposited in the trough is small, and no obvious cathodic protection effect is achieved, which results in weak corrosion resistance and short corrosion resistance life of the finally formed anti-rust layer. If the height H of each peak and the distance L between two adjacent peaks are both larger than 30um, the volume of the trough formed between two adjacent peaks is larger, so that the volume of the active metal layer 130 or the iron layer 120 finally deposited in the trough is also larger, the active metal layer 130 or the iron layer 120 deposited in the trough is easy to corrode, and the finally formed antirust layer cannot achieve a good corrosion resistance effect.

Further, in the above three embodiments, the thickness of the iron layer 120 having the protrusion unit, the active metal layer 130, or the roughness layer preliminarily formed on the iron base material of the metal base 110 is D, wherein D is 5 um. ltoreq. D.ltoreq.200 um. The thickness of the finally formed rust preventive layer is also D. Here, if D is more than 200um, the rust preventive layer is liable to peel off, thereby causing the pot body 100 to be corroded; if D is less than 5um, can lead to the crest height of protruding unit less to no matter be the volume of protruding unit or the volume of the trough that forms between two adjacent crests all is less, thereby in the antirust layer of final formation, no matter active metal layer 130 is deposit in the trough that the iron layer formed, still is located protruding unit department, its volume is all less, leads to active metal layer 130 not to play obvious cathodic protection effect, causes the anticorrosive ability weak of the antirust layer of final formation, and corrosion-resistant short-lived.

It should be noted that in the embodiment according to the present invention, the thermal spraying is preferably arc spraying.

Further, referring to the plan view shown in FIG. 4, in all of the above-mentioned examples, the ratio of the areas of the iron layer 120 and the active metal layer 130 exposed on the surface of the rust preventive layer per unit area of the rust preventive layer is A, wherein 0.1. ltoreq. A.ltoreq.10. It will be appreciated that the ratio of the areas of the iron layer 120 and the active metal layer 130 is also a over the entire inner surface of the formed pot 100. Here, if A is less than 0.1, it results in that the area of the iron layer 120 on the inner surface of the pot body 100 is negligibly small, so that the rust preventive layer is almost formed of the active metal layer 130, and does not have the meaning of a non-coated rust preventive iron pot. If A is larger than 10, the area of the iron layer 120 per unit area of the inner surface of the pot body 100 is too large, and the area of the active metal layer 130 is relatively too small, so that the active metal layer 130 cannot play a significant role in cathodic protection, and thus the iron layer 120 is easily corroded, and the corrosion resistance of the anti-rust layer is poor.

Preferably, in an embodiment according to the present invention, the rust preventive layer has a porosity of M, wherein M.ltoreq.5%. Here, if M is more than 5%, the anticorrosive ability of the anticorrosive coating is weak, and the pot body cannot be protected from corrosion obviously.

The present invention also provides a cooking appliance (not shown in the figures) comprising a pot 100 as described above. It should be noted that the present invention is not limited to a specific type and structure of the cooking appliance, and the pot body 100 of the present invention can be applied to various structures of cooking appliances.

According to another aspect of the present invention, there is also provided a method for processing a pan body 100, comprising the steps of:

s1: manufacturing a pot blank, wherein the base material on the inner side wall of the pot blank is an iron base material;

s2: and forming an anti-rust layer on the inner side wall of the pot blank, wherein the anti-rust layer comprises an iron layer 120 and an active metal layer 130, and at least part of the iron layer 120 and part of the active metal layer 130 are formed on the inner surface of the pot body 100 in a staggered and mixed mode.

According to the first embodiment, the above step S2 includes:

SA 21: forming a raised iron layer 120 on the iron base material on the inner side wall of the pot blank through thermal spraying;

SA 22: forming an active metal layer 130 on the iron layer 120 by thermal spraying;

SA 23: the surface of the active metal layer 130 is alkali-washed so that a portion of the protrusions of the iron layer 120 is exposed to the active metal layer 130.

Here, the active metal layer 130 at the protrusion of the iron layer 120 is removed by the chemical reaction between the active metal layer 130 and the alkali solution, so that the protrusion of the iron layer 120 is exposed on the surface of the active metal layer 130, and the protrusion of the iron layer 120 and the active metal layer 130 are distributed on the inner surface of the pot body 100 in a staggered manner, as shown in fig. 4, thereby forming a cathode protection and protecting the iron layer 120 from corrosion. In other embodiments, before SA23, mechanical polishing may be performed to expose the iron layer 120 under the active metal layer 130, and then SA23 is performed to expose the iron layer 120 with smaller peak.

According to the second embodiment, the above step S2 includes:

SB 21: forming a raised active metal layer 130 on the iron base material on the inner side wall of the pot blank through thermal spraying;

SB 22: forming an iron layer 120 on the active metal layer 130 by thermal spraying;

SB 23: the surface of the iron layer 120 is polished so that the protrusions of the active metal layer 130 are partially exposed out of the iron layer 120.

Here, since the iron layer 120 does not react with the alkali solution, the iron layer 120 at the protrusion of the active metal layer 130 is removed by polishing, so that the protrusion of the active metal layer 130 is exposed on the surface of the iron layer 120, and thus the protrusion of the active metal layer 130 and the iron layer 120 are distributed on the inner surface of the pot body 100 in a staggered manner, as shown in fig. 4, thereby forming a cathode protection and protecting the iron layer 120 from corrosion.

Specifically, in the above embodiment, the step of thermally spraying to form the iron layer 120 includes:

t1: an iron wire is arranged in an electric arc spraying spray gun, wherein the diameter of the iron wire is 1.2 mm;

t2: and controlling the pot blank to rotate, and turning on a power switch of the electric arc spraying spray gun, so that the iron wires are melted and deposited on the surface of the iron base material on the inner side wall of the pot blank to form an iron layer 120. Specifically, the height of the electric arc spraying spray gun from the pot blank is 350-400mm, the wire feeding amount is 60-100cm/min, the pressure of compressed air is 0.4MPa, and the current is 160A.

Further, in the above-described embodiment, the step of thermally spraying to form the active metal layer 130 includes:

k1: an electric arc spraying spray gun is filled with active metal wires; the active metal wire is a metal wire made of a metal element having higher metal activity than iron, and may be, for example, a magnesium wire, a magnesium alloy wire, an aluminum alloy wire, a zinc alloy wire, or the like, as long as the active metal wire corresponds to the type of the active metal layer 120 to be formed; optionally, the active metal wire is an aluminum wire, and the diameter of the aluminum wire is 1.2 mm;

k2: the pot blank is controlled to rotate and a power switch of the arc spraying spray gun is turned on, so that the active metal wire is melted and deposited on the surface of the iron layer 120 to form an active metal layer 130. Specifically, the height of the electric arc spraying spray gun from the pot blank is 250-400mm, the wire feeding amount is 60-100cm/min, the pressure of compressed air is 0.4MPa, and the current is 80A.

According to the third embodiment, the above step S2 includes:

SC 21: roughening the surface of the iron base material on the inner side wall of the pot blank to form a raised rough layer on the surface of the iron base material, wherein the rough layer is the iron layer 120;

SC 22: forming an active metal layer 130 on the roughened layer having the protrusions by thermal spraying;

SC 23: the surface of the active metal layer 130 is alkali-washed so that the protrusions of the partial roughness layer are exposed out of the active metal layer 130.

Thus, the rough layer of the pot blank and the active metal layer 130 together form a rust-proof layer on the inner surface of the final pot body 100. Here, the active metal layer 130 at the protrusion of the rough layer is removed by the chemical reaction of the active metal layer 130 and the alkali solution, so that the protrusion of the rough layer is exposed on the surface of the active metal layer 130, and the protrusion of the rough layer and the active metal layer 130 are distributed on the inner surface of the pot body 100 in a staggered manner, as shown in fig. 4, thereby forming a cathode protection to protect the pot body 100 from corrosion.

In the embodiment of the present invention, after the rust-preventive layer is formed on the inner surface of the pan body 100, since the surface of the rust-preventive layer is rough, the rust-preventive layer can be smoothed by sanding, polishing, or the like, so that the finally formed inner surface of the pan body 100 is smoother and smoother.

After the formation of the rust-preventive layer, in order to further improve the corrosion resistance of the rust-preventive layer, after the step S2, the exposed rust-preventive layer may be subjected to spraying, oxidation, phosphating, or nitriding treatment, thereby forming the protective film layer 125 on the surface of the rust-preventive layer. Of course, the protective film 125 may be formed only on the surface of the exposed iron layer 120, as shown in fig. 5. The protective film layer 125 may be a polyether sulfone layer, an oxide film, a phosphate film or a nitride film, respectively, depending on the method of the surface treatment.

In the description of the present specification, the terms "connected", "fixed", and the like are to be construed broadly unless otherwise explicitly specified or limited. Furthermore, the terms "upper", "lower", "inner", "outer", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or units must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.