阅读说明：本技术 水道用器具 (Water course utensil ) 是由 伊藤継志 西川武 于 2019-05-24 设计创作，主要内容包括：本发明提供一种具有光泽、镍的浸出少的水道用器具。水道用器具(100)是具备实施在母材(101)上的镀镍层(102)的水道用器具(100),镀镍层(102)不包含硫成分,镀镍层(102)的浸出液中的腐蚀电位相对于饱和甘汞电极为－0.01以上(优选为+0.04V以上),利用BYK公司制WaveScan装置测得的镀镍层(102)的Wa值为5.1以下。(The invention provides a water course appliance with luster and less nickel leaching. The water treatment equipment (100) is provided with a nickel plating layer (102) applied on a base material (101), wherein the nickel plating layer (102) does not contain sulfur components, the corrosion potential in the leaching solution of the nickel plating layer (102) is more than-0.01 (preferably more than + 0.04V) relative to a saturated calomel electrode, and the Wa value of the nickel plating layer (102) measured by a WaveScan device manufactured by BYK company is less than 5.1.)

1. A utensil for water course, which is characterized in that,

is a water course appliance provided with a nickel plating layer applied on a base material,

the nickel-plated layer does not contain a sulfur component,

the corrosion potential in the leaching solution of the nickel plating layer is more than-0.01V relative to the saturated calomel electrode,

the Wa value of the surface of the nickel-plated layer is 5.1 or less.

2. The plumbing fixture of claim 1,

the corrosion potential in the leaching solution of the nickel plating layer is more than +0.04V relative to the saturated calomel electrode.

Technical Field

The present invention relates to a technique for reducing nickel leaching in a plumbing fixture in which a base material is plated with nickel.

Background

Conventionally, in view of corrosion resistance, workability, machinability, and the like, copper alloys and the like have been used for water-way appliances used in kitchen faucets, face-washing faucets, bathroom faucets, and the like. Such a water treatment fixture is manufactured by cutting and polishing a rough-formed product made of a copper alloy, and applying nickel plating to the outer peripheral surface of the obtained base material. Note that nickel plating may be further performed on the nickel plating.

As shown in fig. 3, nickel plating may be deposited (entered) in the vicinity of the opening of the drinking water service device to which nickel plating has been applied. Even when chrome plating is applied to the plumbing fixture, the chrome plating is less likely to precipitate inside. In the waterway apparatus 100 shown in fig. 3, when it comes into contact with water, nickel is leached from the base material 101 (nickel is intentionally added to improve corrosion resistance, or nickel is often contained as an undesirable impurity), and nickel is also leached from the periphery of the nickel-plated layer 102.

Specifically, as shown in fig. 4, when the composition of the cross section of the opening of the conventional plumbing fixture on which nickel plating is performed is analyzed, it can be confirmed that a portion (portion inside the plumbing fixture) which is more than 15mm inward from the cross section of the opening becomes high in the detection ratio of the main component (copper) of the base material 101, and nickel is hardly detected, and a portion (portion near the opening of the plumbing fixture) which is less than 15mm inward from the cross section of the opening becomes high in the detection ratio of nickel from the peripheral portion.

Therefore, in a drinking water service device to which nickel plating is applied, a technique for reducing leaching of nickel from the nickel plating (particularly, from the peripheral portion) has been proposed (for example, see patent document 1). According to the technique described in patent document 1, an organic additive containing a sulfur component is added to nickel plating to impart gloss to a water drinking device, and chloral hydrate is added to reduce leaching of nickel into tap water. In this technique, chloral hydrate is added to a nickel plating treatment solution containing an organic additive containing a sulfur component, whereby the potential of nickel plating becomes high and leaching of nickel from nickel plating becomes small.

However, the necessity of maintaining the quality of tap water is determined according to the labor and labor savings based on the tap water method. In "provincial commands on water quality standards" which are executed on day 1 of 4 months in 27 years, a water quality standard item and a standard value are specified (item 51). In addition, in this provincial order, water quality control target setting items and target values (item 26) were confirmed as targets of water quality to be maintained by tap water. Here, nickel is one of the water quality control target setting items, and its target value is 0.02 mg/L.

The management target value determined in the provincial government is assumed to be a water quality standard which drinking water must maintain in the future. In this case, a countermeasure is taken to reduce the amount of nickel (leaching value) leached from the water utility to the drinking water to, for example, 1/10 or less of the value of the water quality control target setting item. The same measures are also required for tap water other than drinking water.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2015-212417.

Disclosure of Invention

However, there is a limit to the reduction of the leaching of nickel by nickel plating with an organic additive containing a sulfur component (hereinafter, also simply referred to as "glossy nickel plating") as in patent document 1. On the other hand, when nickel plating without adding an organic additive containing a sulfur component (hereinafter, also simply referred to as "semi-gloss nickel plating") is used, although leaching of nickel is suppressed, it is difficult to obtain sufficient gloss.

The invention aims to provide a water channel appliance with luster and less nickel leaching.

The present invention relates to a water drinking device comprising a nickel plating layer formed on a base material, wherein the nickel plating layer contains no sulfur component, the corrosion potential in a leaching solution of the nickel plating layer is-0.01V or more relative to a saturated calomel electrode, and the Wa value of the surface of the nickel plating layer is 5.1 or less.

The corrosion potential in the leaching solution of the nickel plating layer is preferably +0.04V or more with respect to the saturated calomel electrode.

The present invention can provide a water treatment device which is glossy and has little leaching of nickel.

Drawings

Fig. 1 is a schematic view of a water course device according to the present embodiment.

Fig. 2 is an exploded view of the water channel device according to the present embodiment.

Fig. 3 is a schematic diagram for explaining a structure in the vicinity of a cross section of an opening of a water course device according to the present embodiment.

Fig. 4 is a diagram showing a detection ratio of metal on the surface inside the opening of the conventional water course device.

FIG. 5 is a graph showing EPMA analysis results of representative examples and comparative examples.

Fig. 6 is an enlarged view of the vicinity of the sulfur peak in fig. 5.

Fig. 7 is a graph showing the relationship between the appearance of the nickel plating layer and the Wa value of the surface (Wa value of a WaveScan device manufactured by BYK corporation) in each of the examples and comparative examples.

Fig. 8 is a graph showing the potential-current curve and the measurement result of the Ni leaching value in the leachate of a typical plating layer.

Fig. 9 is a graph showing a relationship between a corrosion potential and a nickel leaching value in a leaching solution of a typical plating layer.

Detailed Description

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments.

First, an example of a faucet manufactured by combining the water channel device according to the present embodiment will be described. Fig. 1 is a schematic view of a faucet according to the present embodiment. Fig. 2 is an exploded view of the faucet according to the present embodiment. As shown in fig. 1 and 2, the faucet 1 according to the present embodiment is a general faucet (for example, a kitchen faucet, a face wash faucet, a bathroom faucet, or the like) that discharges tap water from the spout 30. The faucet 1 includes a main body 10, legs 20, a spout 30, and a handle 50.

In the present specification, the water passage appliance is used to include not only a faucet metal fitting such as a faucet or a valve for supplying drinking water, but also a joint or a water supply pipe. The water-channel equipment is classified into, for example, "end water-feeding equipment", "water-feeding pipe", "water-feeding equipment provided in the middle of piping", and the like according to the position and function thereof, and the water-channel equipment in the present specification is used to include all of these. The structural water supply appliance has an inner water passage through which water passes and an outer surface which does not come into contact with water. The present invention can be preferably applied to a metal fitting for a faucet.

The main body 10 is a water course device that can be used with various water course devices. The main body 10 includes a screw portion 12 connectable to the leg 20, a screw portion 13 connectable to the spout 30, and a screw portion 14 connectable to the handle 50 via the main shaft 40.

The legs 20 are waterway apparatuses connectable to the main body 10. One end of the leg 20 is connected to a not-shown tap water supply source. A nut 21 is attached to the other end of the leg 20. The leg 20 is coupled to the body 10 by screwing the nut 21 of the leg 20 to the screw portion 12 of the body 10.

The water spouting port 30 is a water course device connectable to the main body 10. A nut 31 is attached to one end of the spout 30, and a head cover 32 is attached to the other end. The spout 30 is connected to the main body 10 by screwing the nut 31 of the spout 30 to the threaded portion 13 of the main body 10.

The handle 50 is a member for adjusting the amount of water discharged. The handle 50 is provided with one end of the spindle 40. The handle 50 is connected to the main body 10 via the main shaft 40 by screwing the other end of the main shaft 40 to the screw portion 14 of the main body 10.

The main body 10, the legs 20, the nut 21, the water discharge port 30, the nut 31, the head cover 32, and the main shaft 40 include a nickel plating layer 102 formed on the outer peripheral surface of the base material 101. In the present embodiment, the body 10, the legs 20, the nut 21, the water discharge port 30, the nut 31, and the head cap 32 include the chromium plating layer 103 formed on the nickel plating layer 102. Further, the main body 10, the leg 20, the spouting port 30 and the like may be subjected to deleading treatment as necessary.

Next, the water drinking utensil according to the present embodiment will be described. Fig. 3 is a schematic diagram for explaining a configuration of a cross section of an opening portion of a main body 10 of the water channel device according to the present embodiment, specifically. Fig. 4 is a diagram showing a detection ratio of metal on the surface inside the opening of the conventional water course device.

As shown in fig. 3, the drinking water service equipment 100 according to the present embodiment includes a nickel plating layer 102 formed on a base material 101. The nickel plating is wound around (enters) the water passage portion in the opening portion of the waterway apparatus 100. In the waterway apparatus 100, when water flows in the direction F1, nickel is leached from the base material 101 and nickel is leached from the periphery of the nickel-plated layer 102.

As shown in fig. 4, the amount of nickel leached from the base material 101 is conventionally smaller than the amount of nickel leached from the peripheral portion of the nickel-plated layer 102. Therefore, in order to reduce the leaching of nickel from the plumbing fixture 100, it is necessary to reduce the leaching of nickel from the peripheral portion of the nickel-plated layer 102. Note that, even if the chromium plating layer 103 is provided on the nickel plating layer 102, the chromium plating layer 103 is not likely to be wound inside, and the chromium plating layer 103 does not contain nickel, so that the presence or absence of the chromium plating layer 103 has little influence on the leaching of nickel.

In the present embodiment, the material of the base material 101 is, for example, a copper alloy. The nickel plating layer 102 is a layer formed on the base material 101. A plating solution having the following composition and conditions is applied to the base material 101, for example, to apply the nickel plating layer 102 to the surface of the base material 101. Further, a chromium plating layer 103 may be formed on the nickel plating layer 102.

The basic composition of the nickel plating bath is a so-called Watt bath in which nickel ions, chloride ions, sulfate ions and boric acid are made into NiCl of the following composition of 50g/L₂·6H₂O, 290g/L NiSO₄·6H₂O, 40g/L H₃BO₃. In addition, plating was carried out at a pH of about 4.0 and a temperature of about 55 ℃.

In addition, as the organic additive, salicylic acid, hexanediol, butanediol, propargyl alcohol, chloral hydrate, and the like which do not contain sulfur can be used.

Since the plating solution does not contain an organic additive (e.g., saccharin) containing sulfur, the nickel plating layer 102 according to the present embodiment does not contain sulfur. Thereby, leaching of nickel from the nickel plating layer 102 becomes less. In the present specification, the phrase "the nickel plating layer does not contain sulfur" means that sulfur is not detected by the elemental analysis (for example, a method described later) of the nickel plating layer by EMPA.

Further, if the corrosion potential in the leachate of the nickel plating layer prepared by using the plating solution is +0.04V or more with respect to the Saturated Calomel Electrode (SCE), the amount of nickel leached into the tap water from the plumbing fixture can be set to 1/10 of the value of the water quality control target setting item or less.

Specifically, by adding 0.8g/L or more (preferably 0.9g/L or more) chloral hydrate to the plating solution, the potential of the nickel plating layer 102 becomes high, and leaching of nickel from the nickel plating layer 102 becomes less. On the other hand, in the case where chloral hydrate in the plating solution is less than 0.8g/L, it is difficult to reduce leaching of nickel alone.

In addition, when the above-mentioned plating solution is used, the Wa value of the WaveScan device manufactured by BYK corporation, which is a nickel plating layer, is set to 5.1 or less, and therefore the surface of the drinking water fountain 100 (nickel plating layer 102) is glossy. Specifically, the plating solution is added with 0.8 to 1.75g/L chloral hydrate, so that the surface of 100 parts of the plating solution has luster. On the other hand, when chloral hydrate in the plating solution exceeds 1.75g/L, fogging occurs on the surface of the water course device 100. In the present specification, the Wa value is measured using WaveScan manufactured by BYK corporation.

Thus, for example, by using a method for manufacturing a plumbing fixture 100 in which a base material 101 is plated with a nickel plating solution containing 0.8 to 1.75g/L of chloral hydrate without containing a sulfur-containing organic additive, the plumbing fixture 100 having luster and little leaching of nickel can be obtained.

According to the present embodiment, the following effects are obtained.

The plumbing fixture according to the present embodiment is a plumbing fixture 100 including a nickel plating layer 102 formed on a base material 101, wherein the nickel plating layer 102 does not contain sulfur, a corrosion potential in a leaching solution of the nickel plating layer is-0.01V or more with respect to a saturated calomel electrode, and a Wa value (Wa value of a WaveScan device manufactured by BYK corporation) of a surface of the nickel plating layer 102 is 5.1 or less. This makes it possible to provide a water drinking device 100 having luster and little leaching of nickel.

The corrosion potential in the leaching solution of the nickel plating layer is preferably +0.04V or more with respect to the saturated calomel electrode. Thus, the amount of nickel leached into the tap water from the water utility can be set to 1/10 of the value of the water quality control target setting item or less.

The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within a range that can achieve the object of the present invention are included in the present invention.

For example, the water treatment device of the present invention can be applied to a water treatment device having no chromium plating layer on a nickel plating layer, and can exhibit the same effect. Further, each drinking water appliance main body may be subjected to deleading treatment as necessary.

Examples

< examples 1 to 5, comparative examples 1 to 10 >

The bodies of the water course appliances of the examples and comparative examples were manufactured under the plating conditions 1 to 15 shown in table 1.

[ Table 1]

< EPMA analysis >

EPMA analysis was performed on the bodies of the water treatment devices of the examples and comparative examples. Representative analysis results of conditions 2, 7, 8, 13, and 15 in which saccharin was contained in the plating solution are shown in fig. 5(a), and representative analysis results of conditions 1, 3, 4, 5, 6, 9, 10, 11, 12, and 14 in which saccharin was not contained in the plating solution are shown in fig. 5 (b). Fig. 6(a) is an enlarged view of the sulfur peak in fig. 5(a), and fig. 6(b) is an enlarged view of the sulfur peak in fig. 5 (b).

As shown in fig. 5 and 6, conditions 2, 7, 8, 13, and 15 are so-called glossy nickel plating with a sulfur component added thereto, and conditions 1, 3, 4, 5, 6, 9, 10, 11, 12, and 14 are so-called semi-glossy nickel plating without a sulfur component added thereto. The semi-gloss nickel plating contains no sulfur and thus less leaching of nickel than the gloss nickel plating.

< appearance Observation >

The surface of the water course equipment under the conditions 1 to 15 was observed by visual observation. The gloss is equal to or higher than that in condition 8 (gloss nickel plating, comparative example 5) and is set to "good". In addition, the conditions 12 and 14 (semi-gloss nickel plating containing no chloral hydrate) had no gloss, and the conditions 9, 10, and 11 were set to "x" because fog was observed. The intermediate glossy portion of "good" and "x" was set to "Δ". The surface of the drinking water dispenser was measured using WaveScan manufactured by BYK corporation, and the relationship between the appearance of the drinking water dispenser and the Wa value was shown in fig. 7.

As shown in fig. 7, it was confirmed that the smaller the Wa value of the surface of the water course device body 10, the greater the gloss of the surface of the water course device. Specifically, it was confirmed that if the Wa value of the surface of the water service equipment is 5.1 or less, the appearance of the product is glossy without any problem, and if the Wa value of the surface is 3.6 or less, the product is glossy as well as the glossy nickel plating.

< Ni Leaching value, Corrosion potential >

The following operations such as conditioning and leaching were performed on the watercourse devices manufactured by Ni plating under the conditions 1, 2, 5, 6, 7, 8, and 12 according to the method described in JIS S3200-7 watercourse device-leaching performance test method.

(1) The water course utensil was washed with tap water for 1 hour, followed by 3 times of washing with water.

(2) The inside of the water course utensil is sealed with a leachate at about 23 ℃ filled therein, and after standing for 2 hours, the water is discarded, and the operation is repeated 4 times.

(3) The water course utensil is filled with the leachate, sealed, and left to stand for 16 hours, and the water is discarded.

(4) The operations of (2) and (3) above were repeated 3 times.

(5) After the operation of (2) above was performed and the mixture was left to stand for 64 hours, the water was discarded.

(6) The operations of (2), (3), (4) and (5) above are repeated once more.

(7) The operations (2), (3) and (4) above were repeated 3 times, and thereafter the operation (2) was performed.

(8) The water course vessel was filled with the leachate, sealed, and left to stand for 16 hours, and then all of the water was collected as detection water.

(9) The concentration of Ni in the detection water was determined by using a general inductively coupled plasma emission spectrometry.

(10) Since the Ni leaching value is calculated by converting the Ni concentration of the collected water to 1L, the Ni leaching value is calculated from the Ni concentration of the detected water and the internal volume of the water drinking device used in the test. The leachate used in the leaching test was water as defined in JIS S3200-7, which was specifically adjusted for the test.

The above operations gave nickel leaching values of the plating layers of conditions 1, 2, 5, 6, 7, 8, and 12 (example 1, comparative example 1, example 4, example 5, comparative example 2, comparative example 3, and comparative example 7). Since the internal capacity of the drinking water appliances varies depending on the type, the leaching value is calculated by using a predetermined conversion equation. Next, the following operation is performed.

(11) A sample is cut out from the portion where Ni plating has been deposited inside the waterway device main body 10, and a coated copper wire is bonded to the sample to form a sample electrode coated with a binder so that only Ni plating is exposed.

(12) The sample electrode, the platinum electrode (counter electrode) and the reference electrode were each a saturated calomel electrode, and the potential-current curve of the sample electrode in the leachate was measured using a potentiometer. Here, the potential at which the current becomes 0.001mA is set as the etching potential.

By the above operation, corrosion potentials in the leach solutions of the plating layers of conditions 1, 2, 5, 6, 7, 8, and 12 (example 1, comparative example 1, example 4, example 5, comparative example 2, comparative example 3, and comparative example 7) were obtained. Fig. 8 shows the results of measuring the potential-current curves and the Ni leaching values in the plating solutions of examples 1, 4, 5, 1, 2, 3, and 7, and fig. 9 shows the relationship between the corrosion potential and the Ni leaching value in the plating solutions of examples 1, 4, 5, 1, 2, 3, and 7.

As shown in fig. 8, it was confirmed that the higher the corrosion potential of the nickel plating layer, the lower the nickel leaching value. Specifically, it was confirmed that if the corrosion potential is-0.01V (vs. SCE) or more, preferably +0.02V (vs. SCE) or more, the nickel leaching value is suppressed as compared with semi-gloss nickel plating not containing chloral hydrate, and if the corrosion potential is +0.04V (vs. SCE) or more, the amount of nickel leached into tap water from the plumbing fixture can be set to 1/10 of the value of the water quality control target setting item or less.

Description of the symbols

100 water course appliance

101 base material

102 nickel plating layer