Preparation method of electroplated cadmium coating for metalwork

A technology for metal parts and preparation steps is applied in the field of preparing a cadmium layer for electroplating on metal parts, which can solve the problems of high toxicity of cyanide, and achieve the effects of simple processing, tight bonding and simple plating solution formula.

Inactive Publication Date: 2012-03-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, cyanide is highly toxic and the lethal dose is only 50 mg

Method used

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  • Preparation method of electroplated cadmium coating for metalwork
  • Preparation method of electroplated cadmium coating for metalwork
  • Preparation method of electroplated cadmium coating for metalwork

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a) The composition of the plating solution is as follows:

[0033] The concentration of cadmium sulfate is 25g / L, the concentration of nickel sulfate is 0.6g / L, the concentration of potassium hydroxide is 60g / L, the concentration of complexing agent ethylenediaminetetraacetic acid is 80g / L, the auxiliary complexing agent ethylene diamine The concentration of amine was 3ml / L.

[0034] b) Plating solution preparation method:

[0035] After dissolving the ethylenediaminetetraacetic acid and ethylenediamine with deionized water, stir evenly. Add cadmium sulfate and nickel sulfate in turn, add potassium hydroxide to adjust the pH value to 8-9, and add deionized water to the required volume. The temperature for solution preparation was 25°C. Cadmium sulfate, nickel sulfate, and potassium hydroxide are all commercially available.

[0036] c) Plating treatment before electroplating:

[0037] Use an ultrasonic cleaning machine to degrease and clean the surface of the metal ...

Embodiment 2

[0043] a) The composition of the plating solution is as follows:

[0044] The concentration of cadmium sulfate is 25g / L, the concentration of nickel sulfate is 0.4g / L, the concentration of potassium hydroxide is 55g / L, the concentration of complexing agent ethylenediaminetetraacetic acid is 75g / L, the auxiliary complexing agent ethylene diamine The concentration of amine was 4ml / L.

[0045] b) Plating solution preparation method:

[0046] After dissolving the ethylenediaminetetraacetic acid and ethylenediamine with deionized water, stir evenly. Add cadmium sulfate and nickel sulfate in turn, add potassium hydroxide to adjust the pH value to 8-9, and add deionized water to the required volume. The temperature for solution preparation was 28°C. Cadmium sulfate, nickel sulfate, and potassium hydroxide are all commercially available.

[0047] c) Plating treatment before electroplating:

[0048] Use an ultrasonic cleaning machine to degrease and clean the surface of the metal ...

Embodiment 3

[0054] a) The composition of the plating solution is as follows:

[0055] The concentration of cadmium sulfate is 28g / L, the concentration of nickel sulfate is 0.5g / L, the concentration of potassium hydroxide is 60g / L, the concentration of complexing agent ethylenediaminetetraacetic acid is 80g / L, the auxiliary complexing agent ethylene diamine The concentration of amine was 4ml / L.

[0056] b) Plating solution preparation method:

[0057] After dissolving the ethylenediaminetetraacetic acid and ethylenediamine with deionized water, stir evenly. Add cadmium sulfate and nickel sulfate in turn, add potassium hydroxide to adjust the pH value to 8-9, and add deionized water to the required volume. The temperature for solution preparation was 35°C. Cadmium sulfate, nickel sulfate, and potassium hydroxide are all commercially available.

[0058] c) Plating treatment before electroplating:

[0059] Use an ultrasonic cleaning machine to degrease and clean the surface of the metal ...

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Abstract

The invention relates to a preparation method of an electroplated cadmium coating for metalwork, belonging to the field of chemical industry, and comprising the following steps of: degreasing and cleaning metalwork to be electroplated by an ultrasonic cleaner, then finely sanding the metalwork, cleaning the surface of the metalwork with clear water and alcohol in sequence, drying the metal surface to remove the alcohol from the surface of the metalwork; and electroplating by a plating solution composed of cadmium sulfate, nickel sulfate, potassium hydroxide, a complexing agent and an auxiliary complexing agent. The preparation method provided by the invention has the advantages that the metalwork is easy to treat, the formula of the plating solution is simple, operation and maintenance are easy, harmful substances such as cyanogen and the like are not contained, and environmental protection is benefited. In addition, the bonding quality between a plated coating and a substrate is good without cracking or damage.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a method for preparing a cadmium electroplating layer on a metal piece. Background technique [0002] The cadmium layer is a cathodic protection coating for steel substrates, but it is a sacrificial anodic protection coating in high temperature or marine climates. The cadmium coating has strong corrosion resistance and is relatively stable in marine environments and hot water at high temperatures (above 70°C). The cadmium layer has good weldability and lubricity, strong contact resistance, good resistance to alkaline solutions, low hydrogen embrittlement, good gloss, and strong adhesion. Therefore, many parts in the aviation, marine and electronic industries are plated with cadmium. Cadmium plating is easy to polish, and can be used as the bottom layer of paint after phosphating. [0003] Cadmium plating solutions can be divided into the following four types: (1) Alkaline cyanid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/26
Inventor 李倩李金许乔利杰
Owner UNIV OF SCI & TECH BEIJING
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