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Method for performing black electroplating treatment on aluminum-based carborundum composite

An aluminum-based silicon carbide and composite material technology, applied in the field of metal material anti-corrosion technology and surface treatment, can solve the problems of difficulty in coloring, the coloring process can not meet the requirements of use, etc.

Inactive Publication Date: 2012-05-30
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of silicon in this material, it is extremely difficult to color it, and the general coloring process cannot meet the requirements of use.

Method used

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  • Method for performing black electroplating treatment on aluminum-based carborundum composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: The material of the plated part is an aluminum-based composite material with a silicon carbide content of 10%.

[0022] 1) The alkaline cleaning solution is an aqueous solution of sodium hydroxide 5g / L and sodium dodecylsulfonate 10g / L, and its process parameters are temperature 85°C and time 10min.

[0023] 2) The pickling solution is 200ml / L of nitric acid, 100ml / L of sulfuric acid, 50ml / L of hydrofluoric acid, and 200g / L of chromic anhydride. The temperature is room temperature and the time is 10s.

[0024] 3) The black electroplating solution is an aqueous solution containing 200g / L of nickel sulfate, 200g / L of zinc sulfate, 200g / L of ammonium thiocyanate, 200g / L of ammonium nickel sulfate, and 150g / L of boric acid. The process parameters are temperature 25°C, Current density 2A / cm 2 .

Embodiment 2

[0025] Embodiment 2: The material of the plated part is an aluminum-based composite material with a silicon carbide content of 90%.

[0026] 1) The alkaline cleaning solution is an aqueous solution of sodium hydroxide 300g / L, and its process parameters are a temperature of 30°C and a time of 10s.

[0027] 2) The pickling solution is 100ml / L of nitric acid, 50ml / L of sulfuric acid, and 200g / L of chromic anhydride. The temperature is room temperature and the time is 20s.

[0028] 3) The black electroplating solution contains 20g / L of nickel sulfate, 100g / L of zinc sulfate, 200g / L of ammonium thiocyanate, and 100g / L of ammonium nickel sulfate. The electroplating process parameters are temperature 70°C, current density 0.1A / cm 2 .

Embodiment 3

[0029] Embodiment 3: The material of the plated part is an aluminum-based composite material with a silicon carbide content of 60%.

[0030] 1) The alkaline cleaning solution is an aqueous solution of sodium hydroxide 200g / L, and its process parameters are a temperature of 60°C and a time of 20s.

[0031] 2) The pickling solution is 200ml / L of nitric acid and 50ml / L of hydrofluoric acid. The temperature is room temperature and the time is 1 min.

[0032] 3) The black electroplating solution contains 100g / L of nickel sulfate, 40g / L of zinc sulfate, 80g / L of ammonium thiocyanate, 10g / L of methionine and 100g / L of triethanolamine. The electroplating process parameters are temperature 40°C, current density 0.5A / cm 2 .

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Abstract

The invention relates to a method for performing black electroplating treatment on an aluminum-based carborundum composite, belonging to the technical fields of the corrosion prevention and the surface treatment of metal materials. The method comprises the following process flows of: deoiling treatment, twice washing, alkaline cleaning, twice washing, acid cleaning, twice washing, deionized water cleaning, black electroplating, twice washing, deionized water cleaning, alcohol cleaning and drying. According to the invention, the surface absorptivity of a black plating, which is formed on the surface of the aluminum-based carborundum composite via the electroplating technology, can reach 80%-97%, the depth of the plating is 2-30 microns; the plating does not fall off, bubble or crack after multiple high-low temperature cycles tests, and can meet the using requirements of the satellite environment.

Description

technical field [0001] The invention relates to a method for performing black electroplating treatment on an aluminum-based silicon carbide composite material, and belongs to the technical fields of metal material anticorrosion technology and surface treatment technology. Background technique [0002] Aluminum-based silicon carbide is a new type of composite material. In addition to the excellent properties of ordinary aluminum alloys, its most prominent advantages are super hardness and small thermal expansion coefficient. It is an ideal material for aerospace products. At present, this material is mostly used in the structural parts of satellite camera systems. Due to the special purpose, the surface of the structural parts must be blackened, and the surface absorption rate after blackening is required to be not less than 90%, which is relatively high. [0003] There are many ways to blacken the surface of aluminum alloy, and the blackening process of anodic oxidation is ...

Claims

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Application Information

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IPC IPC(8): C25D5/44C25D3/56
Inventor 赵月红王振海郑弃非温军国
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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