Trivalent chromium electroplating method of cold-rolled sheet

A technology of trivalent chromium and cold-rolled plate, applied in the field of electroplating, which can solve problems such as inability to obtain coating and poor stability of plating solution

Inactive Publication Date: 2016-02-03
泉州方寸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the following disadvantages: one is to use static plating solution for electroplating, and the pH near the cathode rises too fast, and it is impossible to obtain a coating with a thickness exceeding 5 μm; the other is that the plating solution uses aluminum sulfate as a conductive salt, which is easy to cause the plating solution due to its amphoteric characteristics. poor stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A kind of trivalent chromium electroplating method for cold rolled plate, the composition of described plating solution is: chromium sulfate 135g / L, sodium sulfate 230g / L, potassium sulfate 30g / L, magnesium sulfate 30g / L, boric acid 65g / L, formic acid 0.3 mol / L, 0.2mol / L oxalic acid, 0.5mol / L sodium citrate, 0.001mol / L sodium lauryl sulfate, 0.0025mol / L sodium benzenesulfinate, γ-methacryloxytrimethoxy Silane 0.2mol / L; dibutyl tin diacetate 0.7g / L; the electroplating process is as follows: graphite anode is used, the working temperature is 50-55°C, the pH is 3.5-4.5, and the current density is 22-24A / dm 2 , the electroplating time is 60 minutes, and the speed of the stirrer is 120 rpm.

Embodiment 2

[0016] A kind of trivalent chromium electroplating method for cold rolled plate, the composition of described plating solution is: chromium sulfate 145g / L, sodium sulfate 210g / L, potassium sulfate 40g / L, magnesium sulfate 20g / L, boric acid 75g / L, formic acid 0.1 mol / L, 0.4mol / L oxalic acid, 0.3mol / L sodium citrate, 0.002mol / L sodium lauryl sulfate, 0.0015mol / L sodium benzenesulfinate, γ-methacryloxytrimethoxy Silane 0.4mol / L; dibutyl tin diacetate 0.5g / L; the electroplating process is as follows: graphite anode is used, the working temperature is 50-55°C, the pH is 3.5-4.5, and the current density is 22-24A / dm 2 , the electroplating time is 90 minutes, and the stirrer speed is 100 rpm.

Embodiment 3

[0018] A kind of trivalent chromium electroplating method for cold rolled plate, the composition of described plating solution is: chromium sulfate 140g / L, sodium sulfate 220g / L, potassium sulfate 35g / L, magnesium sulfate 25g / L, boric acid 70g / L, formic acid 0.2 mol / L, 0.3mol / L oxalic acid, 0.4mol / L sodium citrate, 0.0015mol / L sodium lauryl sulfate, 0.0020mol / L sodium benzenesulfinate, γ-methacryloxytrimethoxy Silane 0.3mol / L; dibutyl tin diacetate 0.6g / L; the electroplating process is as follows: graphite anode is used, the working temperature is 50-55°C, the pH is 3.5-4.5, and the current density is 22-24A / dm 2 , the electroplating time is 75 minutes, and the stirrer speed is 100-120 rpm.

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Abstract

The invention discloses a trivalent chromium electroplating method of a cold-rolled sheet. Plating liquid is prepared from chromium sulfate with the density being 135-145 g/L, sodium sulfate with the density being 210-230 g/L, potassium sulfate with the density being 30-40 g/L, magnesium sulfate with the density being 20-30 g/L, boric acid with the density being 65-75 g/L, formic acid with the density being 0.1-0.3 mol/L, oxalic acid with the density being 0.2-0.4 mol/L, sodium citrate with the density being 0.3-0.5 mol/L, sodium dodecyl sulfate with the density being 0.001-0.002 mol/L, benzene sulfinic acid sodium salt with the density being 0.0015-0.0025 mol/L, gamma-methacryloxypropyltriethoxysilane with the density being 0.2-0.4 mol/L and dibutyltin diacetate with the density being 0.5-0.7 g/L. The electroplating technology includes the steps that a graphite anode is adopted, the work temperature is about 50-55 DEG C, the pH is 3.5-4.5, the current density is 22-24 A/dm<2>, the electroplating time is 60-90 min, and the rotating speed of a stirrer is 100-120 r/min.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a trivalent chromium electroplating method for cold-rolled sheets. Background technique [0002] Chromium plating is widely used in industry because of its bright, hard, anti-tarnish, good wear-resistant and corrosion-resistant properties. For a long time, the chromium plating process is a hexavalent chromium plating process using chromic acid as the chromium source. As an electroplating process, hexavalent chromium electroplating has some technical defects, such as extremely low cathode efficiency; poor dispersion and coverage of chromium plating; and no intermediate power interruption during the chromium plating process. What's more, hexavalent chromium is one of the most serious and difficult pollution sources in the electroplating industry. [0003] With the enhancement of people's awareness of environmental protection, hexavalent chromium, as a harmful pollution sou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/06
Inventor 张颖
Owner 泉州方寸新材料科技有限公司
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