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Surface chemical nickel-plating method for improving corrosion resistance of magnesium alloy

A surface chemical, chemical nickel plating technology, applied in liquid chemical plating, metal material coating process, coating and other directions, can solve problems such as accelerated substrate corrosion, achieve good wear resistance, improve corrosion resistance, corrosion resistance Sex-enhancing effect

Active Publication Date: 2017-11-03
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the magnesium alloy substrate, the Mg equilibrium potential is -2.363V, while Ni is -0.250V. Compared with the magnesium alloy substrate, Ni belongs to cathodic protection, so the Ni coating needs to be dense and have a strong bond with the substrate, otherwise it will Because the coating has pores, a small cathode and a large anode appear to accelerate the corrosion of the substrate

Method used

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  • Surface chemical nickel-plating method for improving corrosion resistance of magnesium alloy
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  • Surface chemical nickel-plating method for improving corrosion resistance of magnesium alloy

Examples

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Effect test

Embodiment 1

[0022] Select AZ31B magnesium alloy and process it through the following steps: (1) Alkaline cleaning treatment: firstly, the substrate is polished with sandpaper, and then at a temperature of 40°C, the composition is sodium hydroxide 20g / L, sodium phosphate 20g / L, OP emulsification 2ml / L alkali cleaning treatment solution, soak for 3min; (2) polish the alloy processed in step (1), the composition of the polishing treatment solution used is: phosphoric acid 750ml / L, glycerol 300ml / L, lemon Acid 0.7g / L, copper sulfate 0.5g / L, the temperature of the polishing treatment solution is 40°C, and the polishing treatment is 2min; (3) the alloy treated in step (2) is activated, and the composition of the activation solution used is: hydrogen fluoride Acid 150ml / L, activation temperature is 20 ℃, and activation time is 1min; (4) carry out electroless nickel plating to the alloy that step (3) has been processed, and electroless plating solution consists of: nickel carbonate 13g / L, citric a...

Embodiment 2

[0032] Select AZ31B magnesium alloy and process it through the following steps: (1) Alkaline cleaning treatment: firstly, the substrate is polished with sandpaper, and then at a temperature of 80°C, the composition is sodium hydroxide 50g / L, sodium phosphate 30g / L, OP emulsification 5ml / L alkaline cleaning treatment solution, soak for 5min; (2) polish the alloy processed in step (1), the composition of the polishing treatment solution used is: phosphoric acid 830ml / L, glycerol 250ml / L, lemon Acid 0.6g / L, copper sulfate 0.3g / L, the temperature of polishing treatment solution is 30 ℃, and the polishing treatment time is 1min; (3) the alloy processed in step (2) is activated, and the composition of used activation solution is: Hydrofluoric acid 180ml / L, activation temperature is 25 ℃, and activation time is 2min; (4) carry out electroless nickel plating to the alloy that step (3) has been processed, and electroless plating solution consists of: nickel carbonate 20g / L, citric acid ...

Embodiment 3

[0035]Select AZ31B magnesium alloy and process it through the following steps: (1) Alkaline cleaning treatment: firstly, the substrate is polished with sandpaper, and then at a temperature of 60°C, the composition is sodium hydroxide 30g / L, sodium phosphate 25g / L, OP emulsification 4ml / L alkaline cleaning treatment solution, soak for 7min; (2) polish the alloy processed in step (1), the composition of the polishing treatment solution used is: phosphoric acid 800ml / L, glycerol 350ml / L, lemon Acid 1.0g / L, copper sulfate 0.7g / L, the temperature of polishing treatment solution is 35 ℃, and the polishing treatment time is 3min; (3) the alloy processed in step (2) is activated, and the composition of used activation solution is: Hydrofluoric acid 230ml / L, activation temperature is 30 ℃, and activation time is 3min; (4) carries out electroless nickel plating to the alloy that step (3) has been processed, and electroless plating solution consists of: nickel carbonate 15g / L, citric acid...

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Abstract

The invention discloses a surface chemical nickel-plating method for improving corrosion resistance of a magnesium alloy. The method comprises the steps that 1, pretreatment is conducted, specifically, grinding treatment is conducted to remove oxide skin; 2, then alkali wash is conducted; 3, then polishing treatment is conducted, a conversion film is formed on the surface, and finally, activation treatment is conducted; 4, chemical nickel-plating treatment is conducted; and 5, aftertreatment is conducted, specifically, annealing is conducted for 1-4 hours at the temperature being 100-300 DEG C, internal stress is removed, and film-substrate cohesion is increased. Compared with the traditional technology, according to the chemical nickel-plating surface treatment technology provided by the invention, polishing treatment is conducted before activation, the film-substrate cohesion is increased, and the magnesium alloy treated through the technology is corroded after being steeped in a sodium chloride solution with the weight being 3.5% for 28 days; and meanwhile, higher hardness is achieved, and an alloy being subjected to chemical nickel-plating through the traditional alkali wash activation pretreatment technology can be corroded after being steeped for only 4 days.

Description

technical field [0001] The invention relates to the technical field of surface chemical nickel plating technology, in particular to a surface chemical nickel plating method for improving the corrosion resistance of magnesium alloys. Background technique [0002] Magnesium alloy is the lightest structural material in practical application. It has high specific strength, specific stiffness, specific elastic modulus, and has good machinability, weldability and dimensional stability. It is widely used in aerospace It is known as one of the structural materials with the most potential for development after aluminum. However, due to its high chemical activity and low corrosion resistance, its application is limited. Therefore, for magnesium alloys, it is very important to improve the corrosion resistance of magnesium alloys. There are two main ways to improve corrosion resistance. One is to change the alloy composition to increase its own equilibrium potential, and the other is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36C23C18/18C23G1/22C23F3/03
Inventor 王瑞红马蓓蕾
Owner XIAN UNIV OF TECH