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Whitening agent for improving whiteness of trivalent chromium plating layer

A technology of whitening agent and trivalent chromium, which is applied in the field of trivalent chromium plating layer whitening agent and chrome plating solution, can solve the problems of slow crystallization speed, low current efficiency, dark and unsightly color, etc., and achieve improvement of darkening , change the degree of refinement, and improve the effect of whiteness

Active Publication Date: 2018-12-07
CHONGQING LIDAO SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, there are still many problems in chromium plating with trivalent chromium plating solution, such as unstable plating solution, stainless steel-like color of the coating, darker color and unsightly appearance, slow crystallization speed, low current efficiency, etc.

Method used

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  • Whitening agent for improving whiteness of trivalent chromium plating layer
  • Whitening agent for improving whiteness of trivalent chromium plating layer
  • Whitening agent for improving whiteness of trivalent chromium plating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Each component is made up of following composition by mass ratio in the brightener among the present example (this brightener is expressed with a):

[0033] Brightener a: sodium vinyl sulfonate: ethoxylated propynyl alcohol = 1.5:1; use deionized water to make a solution and then add it to the chrome plating solution according to the corresponding working concentration.

[0034] testing method

[0035] Prepare 250m1 sulfate-type trivalent chromium plating solution, which includes trivalent chromium main salt, complexing agent, conductive salt, buffering agent, and surfactant. The main salt contains 150-200g / L chromium sulfate; its complexing agent is composed of 50-80g / L oxalic acid and 60-90g / L sodium formate; its conductive salt is composed of 50-80g / L sodium sulfate, 50-80g / L potassium sulfate and 5-20g / L ammonium sulfate; its buffer is composed of 55-75g / L boric acid. Its wetting agent is composed of 0.1-0.3g / L sodium dodecylsulfonate. In a 250ml beaker, add 200...

Embodiment 2

[0041] Each component is made up of following composition by mass ratio in the brightener among the present example (this brightener is expressed with b):

[0042] Brightener b: sodium allyl sulfonate: ethoxylated propynyl alcohol = 0.5:1; when used, use deionized water to prepare a solution and then add it to the chrome plating solution according to the corresponding working concentration.

[0043] testing method

[0044] Prepare 250m1 sulfate-type trivalent chromium plating solution, which includes trivalent chromium main salt, complexing agent, conductive salt, buffering agent, and surfactant. The main salt contains chromium sulfate of 150-200g / L. The complexing agent is composed of 50-80g / L oxalic acid and 60-90g / L sodium formate. Its conductive salt is composed of 50-80g / L sodium sulfate, 50-80g / L potassium sulfate and 5-20g / L ammonium sulfate. Its buffer is composed of 55-75g / L boric acid. Its wetting agent is composed of 0.1-0.3g / L sodium dodecylsulfonate. In a 250...

Embodiment 3

[0050] Each component is made up of following composition by mass ratio in the brightener among the present example (this brightener is expressed with c):

[0051] Brightener c: sodium benzene sulfinate: ethoxylated propynyl alcohol = 1.875:1; use deionized water to prepare a solution and then add it to the chrome plating solution according to the corresponding working concentration.

[0052] testing method

[0053] Prepare 250m1 sulfate-type trivalent chromium plating solution, which includes trivalent chromium main salt, complexing agent, conductive salt, buffering agent, and surfactant. The main salt contains chromium sulfate of 150-200g / L. The complexing agent is composed of 50-80g / L oxalic acid and 60-90g / L sodium formate. Its conductive salt is composed of 50-80g / L sodium sulfate, 50-80g / L potassium sulfate and 5-20g / L ammonium sulfate. Its buffer is composed of 55-75g / L boric acid. Its wetting agent is composed of 0.1-0.3g / L sodium dodecylsulfonate. In a 250ml beak...

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Abstract

The invention discloses a whitening agent for improving the whiteness of a trivalent chromium plating layer. The whitening agent is composed of a sulfonyl organic compound and an alkynyl-containing high polymer. According to the whitening agent, the whiteness of a trivalent chromium plating layer is greatly improved after electroplating of a trivalent chromium plating solution of the whitening agent, so that the problem that the trivalent chromium plating layer is dark is solved, the attractiveness of the trivalent chromium plating layer is improved, and the addition of the whitening agent does not have adverse effects on other performances of the plating solution; and the appearance requirement of decorative chrome plating is met, and the whitening agent can be used for production.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and relates to a whitening agent for a trivalent chromium plating layer and a chrome plating solution thereof. Background technique [0002] Chromium plating occupies an extremely important position in the electroplating industry and is listed as one of the three major plating types. The chrome plating layer can be used not only as a decorative coating, but also as a functional coating. In addition to hard chrome, the functional coating can also be used as a lubricating coating due to its micro-cracks that can store oil. The plating solution of electrochrome plating can be divided into hexavalent chromium solution and trivalent chromium solution. Almost all chromium plating uses hexavalent chromium plating solution, but hexavalent chromium is highly toxic and pollutes seriously; trivalent chromium has low toxicity, only six The ratio of trivalent chromium plating to hexavalent chromium pl...

Claims

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Application Information

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IPC IPC(8): C25D3/06C25D3/10
CPCC25D3/06C25D3/10
Inventor 胡国辉包海生肖春艳周辉刘军
Owner CHONGQING LIDAO SURFACE TECH
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