阅读说明：本技术 一种铸铁制品用气体qpq多元复合滴渗剂及其滴渗工艺 (Gas QPQ multi-component composite instillation agent for cast iron product and instillation process thereof ) 是由 顾海军 于 2020-05-28 设计创作，主要内容包括：本发明公开了一种铸铁制品用气体QPQ多元复合滴渗剂及其滴渗工艺,以重量份计,包括以下组份：乙醇80－100份,三乙醇胺30－40份,柠檬酸盐10－20份,氧化稀土粉末6－10份,其他助剂1－5份。本发明通过复配一种多元复合滴渗剂,根据铸铁制品的特点,选择合适的组分及搭配,在渗氮处理时,氨气的分解量得到有效控制,实现了软氮化效果的控制和氮化层厚度的控制,避免了出现软氮化效果不易控制、氮化层厚度不均匀的问题,同时,该滴渗剂对环境友好,无其他有害物质排出,工艺实施简单,技术效果突出,值得推广应用。(The invention discloses a gas QPQ multi-element composite infiltration agent for cast iron products and an infiltration process thereof, wherein the gas QPQ multi-element composite infiltration agent comprises the following components in parts by weight: 80-100 parts of ethanol, 30-40 parts of triethanolamine, 10-20 parts of citrate, 6-10 parts of rare earth oxide powder and 1-5 parts of other additives. According to the invention, by compounding the multi-element composite permeability-reducing agent, proper components and matching are selected according to the characteristics of the cast iron product, the decomposition amount of ammonia gas is effectively controlled during nitriding treatment, the control of the tufftride effect and the control of the thickness of a nitrided layer are realized, the problems that the tufftride effect is difficult to control and the thickness of the nitrided layer is not uniform are avoided, and meanwhile, the permeability-reducing agent is environment-friendly, has no discharge of other harmful substances, is simple in process implementation and prominent in technical effect, and is worthy of popularization and application.)

1. A gas QPQ multi-component composite infiltration agent for cast iron products is characterized by comprising the following components in parts by weight: 80-100 parts of ethanol, 30-40 parts of triethanolamine, 10-20 parts of citrate, 6-10 parts of rare earth oxide powder and 1-5 parts of other additives.

2. The gas QPQ multi-component composite infiltrant for cast iron products according to claim 1, comprising the following components in parts by weight: 85 parts of ethanol, 32 parts of triethanolamine, 13 parts of citrate, 7 parts of rare earth oxide powder and 2 parts of other additives.

3. A gaseous QPQ multicomponent composite infiltrant for cast iron articles according to claim 1 or 2, wherein the citrate is sodium citrate or potassium citrate.

4. The gas QPQ multi-component composite instillation agent for cast iron products as claimed in claim 3, wherein the rare earth oxide powder is modified ultra-fine rare earth oxide, and the modified ultra-fine rare earth oxide is prepared by modification reaction of silane coupling agent in deionized water at 80 ℃ for 3 h.

5. The gaseous QPQ multicomponent composite infiltrant for cast iron articles according to claim 1 or 2, wherein the adjuvant is selected from one or more of a dispersant, sodium gluconate, silicate.

6. The process of instillation of a gaseous QPQ multicomponent composite instillation agent for cast iron articles according to claim 4, comprising the steps of:

s1, uniformly stirring and mixing the ethanol, the triethanolamine, the citrate, the rare earth oxide powder and the auxiliary agent in a mixer according to the proportion to obtain the multi-element composite penetration agent for later use;

s2, placing the cast iron product in a furnace chamber of a co-cementation furnace, and heating the furnace chamber;

s3, loading the multi-component composite penetrant into a liquid injection device, and dripping the multi-component composite penetrant into a furnace chamber of a co-infiltration furnace according to a certain flow rate through an injection needle tube;

s4, introducing the multi-element composite infiltration agent into the furnace chamber to form steam, and nitriding the cast iron product in the form of steam;

and S5, taking out the cast iron product after the nitriding treatment is finished, and finishing the infiltration process.

Technical Field

The invention relates to the technical field of nitriding of cast iron products, in particular to a gas QPQ multi-component composite infiltration agent for cast iron products and an infiltration process thereof.

Background

The QPQ technology is a metal surface composite chemical heat treatment technology for salt bath nitrocarburizing and salt bath oxidation, and can improve the performances of wear resistance, corrosion resistance, fatigue resistance and the like of the surface of a metal material to a great extent. The development history of QPQ technology is from gas nitriding to cyanide nitriding, salt bath tufftriding to gas tufftriding, and gas nitrocarburizing to pollution-free salt bath composite treatment. The gas nitrocarburizing process is essentially gas nitrocarburizing, the raw materials used for the gas nitrocarburizing process mainly comprise urea, formamide, ammonia and the like, the gas nitrocarburizing process not only overcomes the defects of the cyanide nitriding process, but also is greatly improved in the pollution problem, the performance of a nitriding permeated layer is basically equivalent to the permeated layer structure performance of salt bath nitrocarburizing, but the product quality of the gas nitrocarburizing process is influenced by factors such as unstable process, difficult control of the nitrocarburizing effect and the like, and the application of the gas nitrocarburizing process is limited. For example, when the surface of a multi-cavity iron casting is subjected to corrosion prevention and rust prevention by the conventional ammonia dropping method, the ammonia decomposition amount is difficult to control, so that the tufftriding effect is difficult to control, the thickness of a nitrided layer is uneven, and the quality is uncontrollable, so that the improvement of the prior art is urgently needed.

Disclosure of Invention

The invention aims to: aiming at the existing problems, the gas QPQ multi-component composite permeability agent for the cast iron product and the permeability process thereof are provided, the multi-component composite permeability agent is compounded, appropriate components and matching are selected according to the characteristics of the cast iron product, the decomposition amount of ammonia gas is effectively controlled during nitriding treatment, and the nitriding process is controllable, so that the problems that the soft nitriding effect is difficult to control and the thickness of a nitrided layer is not uniform are solved, and the defects of the prior art are overcome.

The technical scheme adopted by the invention is as follows: a gas QPQ multi-component composite infiltration agent for cast iron products is characterized by comprising the following components in parts by weight: 80-100 parts of ethanol, 30-40 parts of triethanolamine, 10-20 parts of citrate, 6-10 parts of rare earth oxide powder and 1-5 parts of other additives.

The multi-element composite permeability agent of the invention takes triethanolamine as a main nitrogen source, takes ethanol as a solvent, then adds citrate and rare earth oxide powder, the citrate is taken as a corrosion inhibitor and a stabilizer, the rare earth oxide powder is taken as a catalyst and an accelerator for promoting the formation of a nitrided layer, when in compounding, inorganic solid and organic liquid are mixed to form suspension, then the permeability agent is prepared, the adding amount is controlled by adopting a permeability manner, the decomposition rate of ammonia is stabilized at 50-60 percent during nitriding treatment, the diffusion speed of nitrogen is faster and more stable, the nitrogen can rapidly pass through each phase region of an iron casting, the concentration of ammonia can be controlled by controlling the flow of the permeability agent, and further the thickness of the nitrided layer on the iron casting is controlled, finally, the technical effects of controllable soft nitriding effect and uniform thickness of the nitrided layer are achieved, and the defects of the prior art are overcome.

In the invention, the composition preferably comprises the following components in parts by weight: 85 parts of ethanol, 32 parts of triethanolamine, 13 parts of citrate, 7 parts of rare earth oxide powder and 2 parts of other additives.

In order to enable citrate to better achieve the effects of corrosion inhibition and stability, the multi-element composite instillation agent provided by the invention is prepared by using sodium citrate or potassium citrate, and preferably sodium citrate.

The multi-element composite instillation agent is prepared by modifying and reacting modified superfine rare earth oxide powder in deionized water at 80 ℃ by using a silane coupling agent for 3 hours. The superfine rare earth oxide after being selected can improve the dispersion uniformity of the rare earth oxide in a solution system, fully exert the catalytic performance of the rare earth oxide and facilitate the decomposition rate of ammonia to be stabilized in a certain range.

Further, the auxiliary agent is selected from one or more of a dispersing agent, sodium gluconate and silicate.

The invention also comprises a dripping infiltration process of the gas QPQ multi-component composite dripping infiltration agent for the cast iron product, which comprises the following steps:

s1, uniformly stirring and mixing the ethanol, the triethanolamine, the citrate, the rare earth oxide powder and the auxiliary agent in a mixer according to the proportion to obtain the multi-element composite penetration agent for later use;

s2, placing the cast iron product in a furnace chamber of a co-cementation furnace, and heating the furnace chamber;

s3, loading the multi-component composite penetrant into a liquid injection device, and dripping the multi-component composite penetrant into a furnace chamber of a co-infiltration furnace according to a certain flow rate through an injection needle tube;

s4, introducing the multi-element composite infiltration agent into the furnace chamber to form steam, and nitriding the cast iron product in the form of steam;

and S5, taking out the cast iron product after the nitriding treatment is finished, and finishing the infiltration process.

In the co-permeation process, the addition amount of the permeation agent is controlled in a dripping permeation mode, so that the concentration of ammonia gas and the formation speed of a permeation layer are controlled, the control of the soft nitriding effect and the control of the thickness of a nitriding layer are realized, the product quality is controllable, the dripping permeation agent is environment-friendly, no other harmful substances are discharged, the process is simple to implement, and the technical effect is outstanding.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: according to the invention, by compounding the multi-element composite permeability-reducing agent, proper components and matching are selected according to the characteristics of the cast iron product, the decomposition amount of ammonia gas is effectively controlled during nitriding treatment, the control of the tufftride effect and the control of the thickness of a nitrided layer are realized, the problems that the tufftride effect is difficult to control and the thickness of the nitrided layer is not uniform are avoided, and meanwhile, the permeability-reducing agent is environment-friendly, has no discharge of other harmful substances, is simple in process implementation and prominent in technical effect, and is worthy of popularization and application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.