Electroplating process for zinc alloy

An electroplating process and zinc alloy technology, which is applied in the field of zinc alloy electroplating process, can solve the problems of no unified standard, low production efficiency, operation errors and omissions, etc., and achieve the effect of simple electroplating process method and good electroplating effect

Inactive Publication Date: 2016-06-29
CHONGQING XUXINYUE NC MACHINERY CO LTD
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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, increasin

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Example Embodiment

[0013] The technical scheme disclosed in the present invention is a zinc alloy electroplating process, which includes the following steps: 1) Polishing-the finished zinc alloy die castings will inevitably have flashing, burrs, indentation, etc., and need to be polished before electroplating To get a good appearance;

[0014] 2) Cold dewaxing-there are more polishing waxes left after zinc alloy polishing. Too long cleaning time in dewaxing water will easily cause corrosion, so it is best to have a cold dewaxing process before ultrasonic, first remove the wax and oil stains. Dissolve and soften;

[0015] 3) Ultrasonic wax removal-the pH and temperature of the wax removal water should not be too high, otherwise it is easy to form pore-like corrosion on the surface of the zinc alloy; if the temperature is high, the wax removal effect must be good; if the material properties can be mastered, high temperature can be used—— Process in a short time;

[0016] 4) Ultrasonic degreasing-if the...

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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...

Claims

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Application Information

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IPC IPC(8): C25D5/34
Inventor 银琦
Owner CHONGQING XUXINYUE NC MACHINERY CO LTD
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