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Electroplating bath, method for manufacturing plated product, and plated product

a technology of electroplating bath and electroplating bath, which is applied in the direction of liquid/solution decomposition chemical coating, coating, chromatisation, etc., can solve the problems of product marketability impairment, and achieve the effect of reducing yellowish color

Inactive Publication Date: 2019-10-03
TOYODA GOSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide an electroplating bath that can prevent the yellowish color of a black plated product. Additionally, the patent provides a method for creating a plated product and a plated product that avoids the yellowish color.

Problems solved by technology

However, the products in which the trivalent chromium plating disclosed in the above patent publication is used have the problem of having a strong yellowish color (b* value) in the obtained black plating film, whereby the product marketability is impaired.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0012]Hereinafter, an electroplating bath according to a first embodiment of the present disclosure will be described. The electroplating bath of the first embodiment is an electroplating bath for precipitating a black trivalent chromium layer onto an object to be plated, and contains trivalent chromium with nanodiamond and a thiocyanate ion as color enhancers.

[0013]The thiocyanate ion is blended to obtain a black appearance in plated products. The concentration of the thiocyanate ion in the electroplating bath is not particularly limited, and is preferably 0.5 g / L to 10 g / L, and more preferably 0.5 g / L to 3 g / L. When the concentration of the thiocyanate ion is 0.5 g / L or more, a black plating appearance with a more favorable color shade is obtained. In particular, when used with the nanodiamond, a jet-black appearance with a reduced yellowish color and lightness is obtained. When the concentration of the thiocyanate ion is 10 g / L or less, a black plating appearance with a more favo...

second embodiment

[0031]Hereinafter, a plated produce according to a second embodiment of the present disclosure will be described. Differences from the first embodiment will mainly be described. The plated product of the second embodiment is a plated product having a black trivalent chromium plating film in which nanodiamond particles are dispersed and a b* value of the surface of the plated product is four or less. A b* value of the surface of the plated product can be measured using a spectrophotometer (e.g., manufactured by Konica Minolta, Inc.: CM-700D).

[0032]Further, the plated product of the second embodiment preferably has an L* value of the surface of fifty or less. With such a characteristic feature, the black trivalent chromium plating film obtains a richer jet-black appearance.

[0033]A method for manufacturing the plated product of the second embodiment can be preferably carried out using the electroplating bath of the first embodiment.

[0034]Specifically, the above plated product is obtain...

example 1

[0052]A 2.5 mL / L of a uDiamond plating additive dispersion (primary particle 4 to 6 nm) manufactured by Carbodeon was added as the nanodiamond to a plating bath base solution (agent B was not used, 5 mL / L of agent D, and 40 mL / L of agent K) for trivalent chromium plating shown in Table 1 so that an amount of nanodiamond was 0.05 g / L in the plating bath. The base plating-treated object to be plated was subjected to the trivalent chromium plating treatment under the conditions shown in Table 2 and nanodiamond particles were coprecipitated.

[0053]Subsequently, the plating-treated product, to which the trivalent chromium plating treatment was applied, was further subjected to a chromate treatment. The chromate treatment was carried out using ECR500 (manufactured by JUC) according to a routine method. The obtained chromate plating-treated object (plated product) was evaluated on the surface appearance for the obtainment of bright appearance according to the criteria shown below. Additiona...

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Abstract

An electroplating bath is configured to precipitate a black trivalent chromium layer onto an object to be plated. The electroplating bath includes a nanodiamond and a thiocyanate ion as color enhancers.

Description

BACKGROUND1. Field[0001]The present disclosure relates to an electroplating bath for obtaining a black plated product with a reduced yellowish color, a method for manufacturing a plated product, and a plated product.2. Description of Related Art[0002]Plating treatment is generally carried out as one of the surface treatment techniques for decorative parts to impart appearance characteristics such as decorativeness of decorative parts including plastics, metals, glasses, and ceramics, and functionalities such as durability. In such plating treatment, a chromium plating layer having a metal-like appearance has a plating film with high hardness and accordingly good appearance characteristics and functionalities, and thus is used as, for example, a finishing uppermost plating layer with copper plating or nickel plating as a base.[0003]In recent years, a demand for rich jet-black appearance has been increasing from the viewpoint of design, and for this reason, a trivalent chromium platin...

Claims

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Application Information

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IPC IPC(8): C25D3/06
CPCC25D3/06C23C18/1653C25D3/08C25D5/14C25D11/38C25D15/00C25D5/623C25D5/627
Inventor NAKATANI, KOJIHOTTA, YUJI
Owner TOYODA GOSEI CO LTD
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