Magnesium and magnesium alloy surface silver-plating method

Abstract

The invention discloses a magnesium and magnesium alloy surface silver-plating method, and relates to the technical field of magnesium alloy silver plating. According to the method, eight steps including shot blasting, oil removal, excitation, residual film removal, zinc immersion, copper plating, silver plating in advance and silver plating are adopted, good silver plating layers are obtained after magnesium and magnesium alloy surfaces are specially treated, according to magnesium and magnesium alloy silver pieces processed through operation of the process, the silver plating layer bonding force is checked by thermal shock tests, the plating layers are free of peeling, blistering and falling, parts obtained after thermal shocks are subject to bonding force tests according to a QJ479-90 marking method, and the plating layers are free of peeling, blistering and falling. Through trials and errors, all silver plating layers are good in bonding force and free of peeling, blistering and falling; through an QJ458-88 anti-sulphur test, the silver plating layers are not subject to aftertreatment, the anti-sulphur performance is larger than 1 min, and the anti-sulphur performance of partssubject to aftertreatment after silver plating is larger than 5 min. The electroplating magnesium and magnesium alloy silver-plating parts are good in bonding force, high in anti-sulphur performance and resistant to corrosion, the plating layers are free of peeling, blistering and falling, and the method is worthy of application and popularization on industry.

Description

technical field [0001] The invention relates to the technical field of silver plating on magnesium alloys, in particular to a method for silver plating on the surface of magnesium and magnesium alloys. Background technique [0002] Magnesium alloy is known as the green engineering material in the 21st century, and the density of magnesium is 1.74g / cm 3 , about 2 / 3 of aluminum and 2 / 9 of iron. The tensile strength of magnesium alloy is about 200MPa ~ 350MPa, which is close to that of aluminum alloy, and the specific strength is higher than that of aluminum alloy and some high-strength steel, which can reduce the weight of metal components. According to relevant data, every 1kg weight reduction of an aircraft entering space is equivalent to saving 1kg of gold. In summary, magnesium alloy has the following special properties: ① light weight: it is the lightest metal structure material; ② high specific strength: the strength-to-mass ratio is the highest among all the most comm...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned technical problems existing in the prior art, the present invention provides a method for plating silver on the surface of magnesium and magnesium alloys; the method is simple in pretreatment, strong in operability, good in binding force and sulfur resistance; overcomes the existing In the technology, the pre-treatment is complex and the process is long; the bath solution is unstable and the operability is poor; the product bonding force is poor, the coating cannot pass the bonding force test, and the coating is easy to peel, foam, and fall off; the coating has poor corrosion resistance.