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Trivalent chromium plating solution and method for chromium-plating using same

A technology of trivalent chromium and plating solution, which is applied in the field of trivalent chromium plating solution, can solve the problems of slow precipitation of coating and achieve the effect of fast precipitation

Pending Publication Date: 2020-07-28
JCU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the precipitation rate of the plating layer of the trivalent chromium plating solution is slow, and it is not a practical product.

Method used

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preparation example Construction

[0032] The preparation method of the plating solution of the present invention is not particularly limited, for example, by adding and mixing a trivalent chromium compound, a complexing agent, a conductive salt, and a pH buffering agent in water at 40 to 50° C., adding and mixing a sulfur-containing organic compound after dissolving, Finally, it is prepared by adjusting the pH with sulfuric acid, ammonia water, etc.

[0033] The plating solution of the present invention can be used to plate the object to be plated with the plating solution of the present invention in the same manner as the conventional chromium plating solution to plate chrome on the object to be plated.

[0034] The conditions of electroplating are not particularly limited, for example, when the bath temperature is 30-60°C, the anode is carbon or iridium oxide, and the cathode current density is 2-20A / dm 2 Electroplating can be carried out for 1 to 15 minutes under certain conditions.

[0035] Examples of th...

Embodiment 1

[0047] chrome:

[0048] The components described in Table 1 were dissolved in water to prepare a trivalent chromium plating solution. For this trivalent chromium plating solution, a Hull cell test was performed using a nickel-plated brass plate. The conditions of the Hull cell test were a current of 4 A and a plating time of 3 minutes. After plating, follow the figure 1 The distance from the left end of the brass plate to which the plated film was deposited was measured using the method described above, and this was taken as the spreading ability. In addition, the film thickness of the portion corresponding to the current density 8ASD of the brass plate was measured with fluorescent X-rays. In addition, the appearance after plating was evaluated by L value, a value, and b value using a color difference meter (made by Konica Minolta Corporation). These results are also shown in Table 1.

[0049] 【Table 1】

[0050] Bath composition Composition 1 Composition 2...

Embodiment 2

[0058] chrome:

[0059] The components described in Table 2 were dissolved in water to prepare a trivalent chromium plating solution. For this trivalent chromium plating solution, a Hull cell test was performed using a nickel-plated brass plate. The conditions of the Hull cell test were a current of 4 A and a plating time of 3 minutes. After the plating, the distance from the left end of the brass plate to which the plating film was deposited was measured. The results are also shown in Table 2. In addition, the relationship between spreading ability and potassium sulfate / ammonium sulfate is shown in figure 2 .

[0060] 【Table 2】

[0061]

[0062] In the case of plating with the above-mentioned trivalent chromium plating solution, it can be seen that the appearance and film thickness are basically the same in all compositions, but in terms of spreading ability, the larger the potassium sulfate / ammonium sulfate is, the better the spreading ability is. 1.0~ The dispersi...

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Abstract

Provided is a trivalent chromium plating solution containing: a trivalent chromium compound; a complexing agent; potassium sulfate and ammonium sulfate as conductive salts; a pH buffer; and a sulfur-containing organic compound, wherein a carboxylic acid having two or more hydroxy groups and two or more carboxy groups, or a salt thereof is used as said complexing agent, and a saccharine or a salt thereof, and a sulfur-containing organic compound having an allyl group are used in combination as said sulfur-containing organic compound. The trivalent chromium plating solution is practical and hasa high plating deposition rate.

Description

technical field [0001] The invention relates to a trivalent chromium plating solution and a chromium plating method using the same. Background technique [0002] Chrome plating is used as a decorative coating because of its silvery white appearance. Conventionally, hexavalent chromium has been used for this chromium plating layer, but in recent years, the use of hexavalent chromium has been restricted due to its environmental impact, and a technique of using trivalent chromium has been shifted. [0003] As such a technology using trivalent chromium, many reports have been made. For example, a chromium electrolytic plating solution containing a complexing agent for trivalent chromium ions such as a water-soluble trivalent chromium salt, malic acid, and a pH buffer compound is known. , Sulfur-containing organic compounds such as thiourea and water-soluble compounds such as saccharin have a pH of 2.8 to 4.2 (Patent Document 1). [0004] However, the precipitation speed of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/06
CPCC25D3/06C25D3/10C25D5/14
Inventor 堀真雄中上圆森川雄斗
Owner JCU CORP
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