Additive of electrolyte for trivalent chromium electroplating of thick chromium plating layer, and electrolyte preparation method

A preparation method and electrolyte technology, which are applied in the field of additives and electrolyte preparation for trivalent chromium electroplating thick chromium electrolyte, can solve problems such as the continuous electroplating capacity of the plating solution and the limitation of the continuous electroplating capacity of the plating solution.

Inactive Publication Date: 2014-03-12
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

USP 20080169199 discloses a trivalent chromium electroplating solution. Although the thickness of the coating is about 50 μm, there is no additive that can enhance the continuous electroplating ability of the platin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: To prepare additives, take 500 ml of deionized water, heat it to 90 ° C, add MgCl 2 380g, stirred until dissolved, then added H 8 C 6 o 7 390g, stir to dissolve, add deionized water to 1 L, seal and store at 80 ℃ for 5 hours; take 400 ml deionized water, add CrCl 3 ?6H 2 O 213 g, ammonium formate 76 g, boric acid 40 g, sodium chloride 100 g, stir to dissolve completely, add 100 ml of additives to it; add deionized water to 1 L, place and age at 40 ℃ for 24 hours; The pH of the solution was adjusted to 2; the electroplating test piece was polished, activated, and washed with water at 15 A / dm 2 Electroplating for 1 h at a current density of 28 μm thick white coating can be obtained, and the stability of the electrolyte can reach 200 Ah / L.

Embodiment 2

[0022] Example 2: To prepare additives, take 500 ml of deionized water, heat it to 90 ° C, add MgCl 2 190g, stirred until dissolved, then added H 2 C 2 o 2 250g, stir to dissolve, add deionized water to 1L, seal at 80 ℃ for 5h for later use; take 400 ml of deionized water, stir to dissolve, then add CrCl 3 ?6H 2O213 g, ammonium formate 76 g, boric acid 40 g, potassium chloride 100 g, add 200 ml of additives; add deionized water to 1 L, leave it at 40 ℃ for 24 hours; adjust the pH of the electroplating solution to 2 before use; After polishing, activating and washing, the electroplating test piece was tested at 15 A / dm 2 Plating at a current density of 2.5 h, a 55 μm thick white and bright coating can be obtained, and the stability of the electrolyte can reach 180 Ah / L.

Embodiment 3

[0023] Example 3: Prepare additives, take 500 ml deionized water, heat it to 90 °C, add Al 2 (SO 4 ) 3 420 g, stirred until dissolved, then added H 8 C 6 o 7 240 g, stir to dissolve, add deionized water to 1L, seal at 80 ℃ for 5h for later use; take 400 ml of deionized water, stir to dissolve, then add Cr 2 (SO 4 ) 3 ?6H 2 Add 250 g of O, 32 g of formic acid, 60 g of boric acid, 100 g of potassium sulfate, and 100 g of sodium sulfate, and add 160 ml of additives; add deionized water to 1 L, and place it at 40 °C for 24 hours; adjust the pH of the electroplating solution to 2 before use; After polishing, activating and washing the electroplated test piece, the 2 Electroplating at a current density of 80 μm thick white bright coating can be obtained by continuous electroplating for 3 h, and the stability of the electrolyte can reach 100 Ah / L.

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Abstract

The present invention discloses an additive of an electrolyte for trivalent chromium electroplating of a thick chromium plating layer, and an electrolyte preparation method thereof. The additive is an aqueous solution prepared by using deionized water, and comprises at least a light metal compound and at least an organic carboxylic acid or carboxylate, wherein the concentration of the light metal compound is 80-900 g/L or 60-600 g/L, and the concentration of the organic carboxylic acid or carboxylate is 30-500 g/L. The preparation method comprises: adding a light metal compound and an organic carboxylic acid or carboxylate to deionized water under stirring, aging for 5-10 h at a temperature of 80 DEG C to prepare the additive, adding half of deionized water to a plating tank according to an electrolyte preparation volume, adding chromium sulfate or chromium chloride, formic acid or a formate, boric acid, a conducting salt potassium sulfate or potassium chloride and the additive according to a certain concentration, adding deionized water to achieve the electrolyte preparation volume, and aging for 24 h at a temperature of 40 DEG C to prepare the electrolyte, wherein the pH value of the electrolyte is adjusted to 1-3 so as to perform electroplating. With the electrolyte prepared by using the additive, the trivalent chromium electroplating time can be effectively prolonged, and the chromium plating layer thickness can be increased.

Description

technical field [0001] The invention relates to an additive for trivalent chromium electroplating thick chromium electrolyte and a method for preparing the electrolyte. Background technique [0002] Chromium plating has good hardness, wear resistance, corrosion resistance and appearance decoration. It is not only used for decorative coatings, but also widely used for functional coatings. At present, chrome plating has become one of the most widely used plating types in the electroplating industry. For a long time, hexavalent chromium electroplating process has been used in chrome plating, and hexavalent chromium is highly toxic and a carcinogen. The toxicity of trivalent chromium is very low, only 1% of hexavalent chromium (Chromium’s biological function and pollution control[J]. Journal of Chongqing Gongshang University (Natural Science Edition), 2004, 21(4): 325-328. Authors: Jiang Lan, Wang Xiaolan); Compared with using trivalent chromium instead of hexavalent chromium ...

Claims

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Application Information

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IPC IPC(8): C25D3/06C25D3/10
Inventor 侯峰岩王庆新吕春雷
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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