Electroplating process for zinc alloy

Abstract

The invention discloses an electroplating process for zinc alloy. The electroplating process is characterized by comprising the following steps: 1) polishing, wherein a finished zinc alloy die-casting unavoidably has flashes, burrs, impressions and the like and has to undergo polishing so as to obtain good appearance; 2) cold wax removal; 3) ultrasonic wax removal; 4) ultrasonic oil removal, wherein the zinc alloy can directly undergo electrolysis for oil removal if the surface of the zinc alloy is not full of oil stains, good ultrasonic oil removal effect can be obtained for parts with a great number of oil stains, complicated shapes, grooves or blind holes, and the pH value of oil removing powder should not be too high because strong base exerts fast dissolving effect on aluminum, which leads to dissolving-out of shrinkage cavities in the surfaces of the parts, and the shrinkage cavities influence bonding force if not thoroughly cleaned in the process of electroplating; 5) oil removal through electrolysis of a negative electrode; 6) oil removal through electrolysis of a positive electrode; and 7) activation, wherein the zinc alloy is normally activated in a hydrofluoric acid solution or in a hydrofluoric acid-sulfuric acid solution, activation salt is also commercially available, and since zinc is amphoteric metal and is prone to dissolving and corrosion in strong acid and strong base, activation is normally carried out in weak acid.

Description

technical field [0001] The invention relates to a zinc alloy electroplating process. Background technique [0002] Zinc alloy is an alloy composed of zinc and other elements. Often added alloying elements are aluminum, copper, magnesium, cadmium, lead, titanium and other low-temperature zinc alloys. Zinc alloy has a low melting point, good fluidity, easy welding, brazing and plastic processing, corrosion resistance in the atmosphere, and the residual waste is easy to recycle and remelt; but the creep strength is low, and it is prone to dimensional changes caused by natural aging. Prepared by melting method, die-casting or pressure processing. [0003] At present, the electroplating process of zinc alloy is relatively simple, and there is no unified specification and standard, resulting in uneven quality of the electroplating process of zinc alloy produced, and many repeated processes also make the production efficiency low, increasing the labor burden of workers, and at th...

AI Technical Summary

Problems solved by technology

[0003] At present, the electroplating process of zinc alloy is relatively simple, and there is no unified specification and standard, resulting in uneven quality of the electroplating process of zinc alloy produced, and many repeated processes also make the production efficiency low, increasing the labor burden of workers, and at the same time Make the product less competitive in the market

For some operators who have just entered the industry, there is no clear method and process, resulting in frequent mistakes and omissions during operation, and may even cause serious consequences