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Surface nickel plating method for molybdenum-based composite material

A composite material and molybdenum-based technology, which is applied in the field of nickel plating on the surface of molybdenum-based composite materials, can solve the problems of small embedded molybdenum-based composite materials, coating peeling or blistering, etc. The effect of poor binding

Active Publication Date: 2014-07-09
NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still many problems in the existing surface electroplating process of molybdenum-based composite materials, mainly including: First, in the production process of most molybdenum-based composite materials, aluminum oxide powder is usually used as an abrasive for fine grinding. Angular and hard, it is easy to embed into the copper phase in the molybdenum-based composite material, causing fine alumina particles to be embedded on the surface of some copper-enriched areas. If the alumina particles on the surface are not removed before plating, after plating The coating is prone to peeling or blistering; second, the molybdenum-based composite material is a powder metallurgy material, and the lack of powder metallurgy technology itself often leads to low density of the molybdenum-based composite material itself (less than 98%). There are many remaining holes, so the surface of the molybdenum-based composite material cannot be directly electroplated to obtain a thicker coating with good adhesion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Nickel plating on the surface of the molybdenum-based composite material includes the following steps:

[0031] ① Degreasing

[0032] Cathodic electrolytic degreasing is used to remove oil stains on the surface of molybdenum-based composite parts; specifically: put the molybdenum-based composite material in the electrolyte at 60°C and the cathode current density is 1A / dm 2 Under the condition of degreasing 5min, clean up with tap water after degreasing; Described electrolytic solution is the mixed aqueous solution of sodium hydroxide, sodium carbonate, sodium phosphate, sodium silicate, and wherein, the concentration of sodium hydroxide is 30g / L, The concentration of sodium carbonate is 30g / L, the concentration of sodium phosphate is 50g / L, and the concentration of sodium silicate is 10 / L.

[0033] ② Etching

[0034] Place the molybdenum-based composite material in an etching solution at 30°C for 1 min to wash off the processed layer produced on the surface of the par...

Embodiment 2

[0053] Nickel plating on the surface of the molybdenum-based composite material includes the following steps:

[0054] ① Degreasing

[0055] Cathodic electrolytic degreasing is used to remove oil stains on the surface of molybdenum-based composite parts; specifically: put the molybdenum-based composite material in the electrolyte at 90°C and the cathode current density is 5A / dm 2 Under the condition of degreasing 10min, clean up with tap water after degreasing; Described electrolytic solution is the mixed aqueous solution of sodium hydroxide, sodium carbonate, sodium phosphate, sodium silicate, and wherein, the concentration of sodium hydroxide is 40g / L, The concentration of sodium carbonate is 40g / L, the concentration of sodium phosphate is 70g / L, and the concentration of sodium silicate is 20g / L.

[0056] ② Etching

[0057] Place the molybdenum-based composite material in an etching solution at 50°C for 3 minutes to wash off the processed layer produced on the surface of t...

Embodiment 3

[0076] Nickel plating on the surface of the molybdenum-based composite material includes the following steps:

[0077] ① Degreasing

[0078] Cathodic electrolytic degreasing is used to remove oil stains on the surface of molybdenum-based composite parts; specifically: put the molybdenum-based composite material in the electrolyte, 75 ° C, cathode current density 3A / dm 2 Under the condition of degreasing 8min, clean up with tap water after degreasing; Described electrolytic solution is the mixed aqueous solution of sodium hydroxide, sodium carbonate, sodium phosphate, sodium silicate, and wherein, the concentration of sodium hydroxide is 35g / L, The concentration of sodium carbonate is 35g / L, the concentration of sodium phosphate is 60g / L, and the concentration of sodium silicate is 15 / L.

[0079] ② Etching

[0080] Put the molybdenum-based composite material in the etching solution for 2 minutes at 40°C to wash off the processed layer produced on the surface of the part durin...

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Abstract

The invention provides a surface nickel plating method for a molybdenum-based composite material. The method comprises the following steps: deoiling; etching; activation; nickel preplating; nickel plating; heat treatment; deoiling; etc. The method can effectively remove impurities and an oxide film on the surface of the molybdenum-based composite material, overcomes the problem of poor bonding force of an electroplated layer of the molybdenum-based composite material and enables plated nickel on the surface of the molybdenum-based composite material to closely bond with a substrate.

Description

technical field [0001] The invention belongs to the field of material surface treatment, and in particular relates to a surface nickel plating method of a molybdenum-based composite material, which can obtain a coating with good bonding force on the surface of the molybdenum-based composite material. Background technique [0002] Molybdenum-based composite material is a pseudo-alloy composed of molybdenum and copper, which are two mutually insoluble metals, and is a powder metallurgy composite material. Molybdenum-based composite materials combine the advantages of molybdenum and copper. Not only the thermal expansion coefficient is similar to that of semiconductor and ceramic materials, but also has a high thermal conductivity, and has the ability of plastic deformation of metal materials. More importantly, the material can be changed by changing The relative content of molybdenum and copper is used to design the density, thermal conductivity and thermal expansion of the co...

Claims

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Application Information

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IPC IPC(8): C25D3/12C25D5/28C25D5/38C25D5/50
Inventor 解瑞谢新根张韧钟明全
Owner NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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