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A kind of black chromium electroplating solution, composite coating and preparation method thereof

A technology of composite coating and electroplating solution, which is applied in the field of composite coating and its preparation, and black chromium electroplating solution, which can solve the problems of light color of trivalent black chromium coating, single color of workpiece products, and failure to satisfy consumers, etc., and achieve good uniform plating The effect of good ability, good decoration and good covering ability

Active Publication Date: 2019-05-17
SWELL MARUI GUANGZHOU AUTOMOBILE PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing electroplating chromium mainly adopts the traditional hexavalent chromium plating technology, hexavalent chromium is highly toxic, and the electroplating solution is difficult to handle, and the color of the decorative strip formed by hexavalent chromium electroplating is silvery white, which makes the color of the workpiece product relatively single
Although trivalent black chromium coatings have also occurred in the prior art, the color of trivalent black chromium coatings is lighter and cannot meet the needs of consumers

Method used

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  • A kind of black chromium electroplating solution, composite coating and preparation method thereof
  • A kind of black chromium electroplating solution, composite coating and preparation method thereof
  • A kind of black chromium electroplating solution, composite coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0054] The present embodiment provides a kind of preparation method of composite coating, comprises the steps:

[0055] (1) Provide the substrate and pretreat the substrate:

[0056] The base material adopts electroplating grade ABS injection molded parts.

[0057] Place the base material in an ultrasonic degreasing solution containing 50g / L of ENPREP 142 alkaline degreasing agent, and perform immersion degreasing treatment at a temperature of 45±5°C for 5 minutes. After triple water washing, place the degreased substrate in a roughening solution containing 400g / L chromic anhydride and 400g / L sulfuric acid, and immerse it for 11min at a temperature of 67±3°C to form micropores on the surface of the substrate shape structure. After six-way water washing, place the roughened substrate in a solution containing 75 g / L of hydrochloric acid and 6 g / L of hydroxylamine sulfate, and immerse it for 2 minutes at room temperature to reduce hexavalent chromium ions to trivalent chromium ...

Embodiment 2

[0072] The present embodiment provides a kind of preparation method of composite coating, comprises the steps:

[0073] (1) A substrate is provided, and the substrate is pretreated, and the steps of the pretreatment are the same as in Example 1.

[0074] (2) Electroplating forms a bright copper layer on the substrate, and carries out copper microetching to the bright copper layer:

[0075] Place the pretreated base material obtained in step (1) into copper sulfate 220g / L, sulfuric acid 65g / L, chloride ion 90PPM, CUPROSTAR 1560 leveler 0.5ml / L, CUPROSTAR 1560 carrier 0.6ml / L and CUPROSTAR 1560 cylinder opening agent 8ml / L copper plating electroplating solution, at a temperature of 27±3°C and a current density of 3±0.5A / dm 2 Electroplating for 40min under certain conditions, triple washing to form a bright copper layer with a thickness of 20±5μm.

[0076] The substrate on which a bright copper layer has been formed is placed in a mixture of sulfuric acid 40g / L and ENTEK Microe...

Embodiment 3

[0088] The present embodiment provides a kind of preparation method of composite coating, comprises the steps:

[0089] (1) A substrate is provided, and the substrate is pretreated, and the steps of the pretreatment are the same as in Example 1.

[0090] (2) Electroplating forms a bright copper layer on the substrate, and carries out copper microetching to the bright copper layer:

[0091] Place the pretreated base material obtained in step (1) into copper sulfate 180g / L, sulfuric acid 75g / L, chloride ion 90PPM, CUPROSTAR 1560 leveler 0.5ml / L, CUPROSTAR 1560 carrier 0.6ml / L and CUPROSTAR 1560 cylinder opening agent 8ml / L copper plating electroplating solution, at a temperature of 27±3°C and a current density of 3±0.5A / dm 2 Electroplating for 40min under certain conditions, triple washing to form a bright copper layer with a thickness of 20±5μm.

[0092] The substrate on which the bright copper layer has been formed is placed in a mixture of sulfuric acid 25g / L and ENTEK Micr...

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Abstract

The invention relates to a black chromium electroplating solution, a composite coating and a preparation method thereof. The black chromium electroplating solution includes an aqueous solution of the following concentration components: chromium chloride 100-150g / L, boric acid 55-70g / L, conductive salt 160-305g / L, complexing agent 70-160g / L, wetting agent 0.02 -0.15g / L, ferrous ammonium sulfate 0.5-1.5g / L and blackening agent 10-50g / L; wherein said blackening agent is a mixture of methionine, potassium thiocyanide and aspartic acid. The trivalent black chromium coating formed by electroplating with this black chromium electroplating solution has deep black color and strong uniform coverage, and can be matched with bright copper layer, semi-bright nickel layer, bright nickel layer, microporous nickel layer and passivation film layer , so that the composite coating obtained as a whole has strong corrosion resistance and is uniform and dark black.

Description

technical field [0001] The invention relates to the field of electroplating products, in particular to a black chromium electroplating solution, a composite coating and a preparation method thereof. Background technique [0002] With the rapid development of the economy, decorative parts are becoming more and more common, and consumers also have different needs for the color of decorative parts. Among them, the chrome-plated layer has the characteristics of high hard plating and good wear resistance, and is widely used in the field of decorations such as decorative parts. However, the existing electrochrome plating mainly adopts the traditional hexavalent chromium plating technology. Hexavalent chromium is highly toxic, and the electroplating solution is difficult to handle, and the color of the decorative strip formed by hexavalent chromium electroplating is silvery white, which makes the color of the workpiece product relatively single. Although the trivalent black chromi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/08C25D5/14C25D3/38C25D5/48C25D3/12
CPCC25D3/08C25D3/12C25D3/38C25D5/14C25D5/48
Inventor 郑静涛刘建兵张宇
Owner SWELL MARUI GUANGZHOU AUTOMOBILE PARTS
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