Novel method for electroplating gold on surface of molybdenum-copper alloy

A molybdenum-copper alloy and gold electroplating technology, applied in electrophoretic plating, electrolytic coatings, coatings, etc., can solve the problems of high processing cost, low benign rate of plating treatment, affecting the surface roughness of molybdenum-copper alloy substrates, etc.

Inactive Publication Date: 2021-09-28
JINGZHOU NANHU MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the existing process of improving the bonding force of the coating through chrome plating, improving the bonding force of the coating through heat treatment of the nickel layer, and improving the bonding force of the coating through the replacement of palladium chloride, it is easy to cause environmental pollution and cannot handle precision parts and complex-shaped workpieces, and the scope of application is limited; The effect of heat treatment is poor, the benign rate of coating treatment is low, which seriously affects the surface roughness of the molybdenum-copper alloy substrate after treatment, and the palladium salt activation is expensive and the processing cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Ultrasonic degreasing

[0037] Ultrasonic cleaning and degreasing of molybdenum-copper alloy workpieces by soaking. The solution used for degreasing is DS-1152 cleaning agent with a volume fraction of 90ml / L, and the rest is tap water. The frequency of the ultrasonic cleaning machine used is 40KHz. Ultrasonic cleaning The temperature is 45°C, and the time is 3 minutes. After the ultrasonic cleaning machine is cleaned, the molybdenum-copper alloy workpiece is rinsed with running water;

[0038] 2) Chemical pickling

[0039] The pickling solution selected for chemical pickling is composed of nitric acid with a volume fraction of 380ml / L, sulfuric acid with a volume fraction of 380ml / L and water with a volume fraction of 240ml / L. The actual operating temperature is 15°C and will be cleaned in step 1. After the molybdenum-copper alloy workpiece is immersed in the pickling solution and shakes for 15 seconds, it is immediately taken out and rinsed with running water. It i...

Embodiment 2

[0051] 1) Ultrasonic degreasing

[0052] Molybdenum-copper alloy workpieces are ultrasonically cleaned and degreased by immersion. The solution used for degreasing is DS-1152 cleaning agent with a volume fraction of 100ml / L, and the rest is tap water. The frequency of the ultrasonic cleaning machine is 40KHz, and the ultrasonic cleaning temperature at 50°C for 2 minutes, rinse with running water after ultrasonic cleaning;

[0053] 2) Chemical pickling

[0054] The pickling solution selected for the chemical pickling solution consists of nitric acid with a volume fraction of 400ml / L, sulfuric acid with a volume fraction of 400ml / L and water with a volume fraction of 200ml / L. The actual operating temperature is 20°C, and the molybdenum-copper alloy workpiece is immersed in the solution After shaking for 13 seconds, take it out immediately and rinse it with running water to ensure that there is no oxide residue on the surface of the workpiece;

[0055] 3) activation

[0056] T...

Embodiment 3

[0066] 1) Ultrasonic degreasing

[0067] Molybdenum-copper alloy workpieces are ultrasonically cleaned and degreased by immersion. The solution used for degreasing is DS-1152 cleaning agent with a volume fraction of 110ml / L, and the rest is tap water; the frequency of the ultrasonic cleaning machine is 40KHz, and the ultrasonic cleaning temperature is 55℃, the time is 1min, after the ultrasonic cleaning is completed, rinse with running water;

[0068] 2) Chemical pickling

[0069] The pickling solution selected for the chemical pickling solution consists of nitric acid with a volume fraction of 420ml / L, sulfuric acid with a volume fraction of 420ml / L and water with a volume fraction of 160ml / L. The actual operating temperature is 25°C, and the molybdenum-copper alloy parts are immersed in the solution After shaking in the medium for 10s, take it out and rinse it with running water immediately. It is necessary to ensure that there is no oxide residue on the surface of the work...

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PUM

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Abstract

The invention relates to a novel method for electroplating gold on the surface of molybdenum-copper alloy, and belongs to the technical field of metal surface treatment. The method comprises the seven steps that acid pickling is conducted through an acid pickling solution composed of nitric acid with the volume fraction being 390-410 ml/L, sulfuric acid with the volume fraction being 390-410 ml/L and water with the volume fraction being 180-220 ml/L, activation is conducted through hydrochloric acid with the volume fraction being 45-55%, and chemical coarsening is conducted through an anode etching coarsening solution of sulfuric acid with the volume fraction being 650-750 ml/L. On the basis that flash nickel plating is directly conducted in a chemical nickel solution and then chemical nickel plating is conducted to form a nickel plating layer, good binding force of the plating layer and a base material is achieved, the binding force of the gold-plated layer and the base material and the welding performance of gold-tin solder to the gold-plated layer are enhanced, the gold-tin solder is good in wettability on the surface of the gold-plated layer after being baked for 10 min at the high temperature of 350 DEG C, the gold-plated layer does not blister or discolor, the thickness is uniform, the color is consistent, the environment is not polluted, and the cost is low. The method is suitable for machining all workpieces including precise workpieces and workpieces with complex shapes.

Description

technical field [0001] The invention relates to a new method for electroplating gold on the surface of a molybdenum-copper alloy, which belongs to the technical field of metal surface treatment. Background technique [0002] Molybdenum-copper alloy has excellent characteristics of high electrical conductivity, high thermal conductivity and small expansion coefficient, and is widely used in many fields such as national defense, aerospace, electronics, metallurgy, and chemical industry; however, the surface of molybdenum-copper alloy is easily oxidized, and the chemical properties of the oxide film Stable, resulting in poor surface wettability of molybdenum-copper alloy, difficult processing, unable to meet the application requirements of national defense and aerospace products. The molybdenum-copper alloy finally meets the standards for use in national defense and aerospace products. Based on this, the coating bonding force and weldability of the molybdenum-copper alloy gold ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/12C25D3/12C25D5/18C25D5/38C25D13/22C25D3/48C25F3/02C23G1/10C23G1/00
CPCC25D5/12C25D3/12C25D5/18C25D5/38C25D13/22C25D3/48C25F3/02C23G1/103C23G1/00
Inventor 侯文斌李晓刚舒建文冯迎雪
Owner JINGZHOU NANHU MACHINERY CO LTD
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