Method of directly electrodepositing zinc-nickel alloy on magnesium alloy surface

Abstract

The present invention relates to a process for direct electrodeposition of zincium nickel alloy at electron alloys surfaces. According to the process, an electroplating method is adopted, electron alloys is selected as cathode, zincium nickel alloy containing nickel of 8-12% therein is selected as anode, the electric current density during electric plating is controlled at 1-2 A / dm2, and the electric plating time is 1 hour; finally, the electron alloys suffering an electrodeposition of zincium nickel alloy is put to a heat treatment furnace for a heat treating at the temperature of 150-200 DEG C and for 1 hours; the electrolysing solution adopted uses deionized water as solvent, wherein the components and their concentrations are as follows: ZnF2 8-12 g / L, NiF2, 15-25 g / L, ammonium citrate 80-120 g / L, potassium sodium 50-70 g / L, EDTA 8-12 g / L, hexamethylenetetramine 1-2 g / L, all the solutes are stirred to being entirety dissolved and into clear solution , in which the mole ratio of zincium ion to ion is controlled within 1:2-3. Said process for electrodeposition of zincium nickel alloy at electron alloys surfaces by adopting electric plating method is not dependant on the grade of electron alloys, in other words, surfaces of electron alloys of any grades can be electrodeposited with zincium. On one hand, the cost for electron alloys mat-forming treatment is reduced; on the other hand, the electroplating method is easy to realize industrialisation production. The fluorinion in zinc fluoride (nickel fluoride) plating solution exhibits an inactivating sheltering effect of the electron alloys, preventing the electron alloys being eroded in the solution. And the zinc fluoride (nickel fluoride) plating solution is of periodic duty and will not pollute the environment.

Description

technical field [0001] The invention relates to a method for directly electrodepositing a zinc-nickel alloy on the surface of a magnesium alloy. Background technique [0002] Magnesium is the lightest metal structural material. Magnesium alloys have attracted much attention due to their small volume and mass, high specific strength, good processability, good electromagnetic shielding, and good vibration reduction, electrical and thermal conductivity. Magnesium alloys have developed greatly since they were used in the aerospace industry in the early days to the current applications in automotive materials, optical instruments, electronic telecommunications, and military industries. But the chemical stability of magnesium is low, the electrode potential is very negative (-2.34V), and the corrosion resistance is poor, which restricts the wide application of magnesium alloy materials to some extent. Therefore, the surface treatment of magnesium alloys and how to improve the cor...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a method for directly electrodepositing zinc-nickel alloy on the surface of magnesium alloys, so as to solve the problems of high cost and complicated process of the existing magnesium alloy surface treatment process, which has caused the magnesium alloy surface treatment to be unable to realize large-scale industrialization so far. production problem