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Can Anode Electro oil Remove in Zinc Alloy Plating
浏览: 发布日期:2019-05-13
In the experience of zinc alloy plating enterprises, cathode electrolytic oil removal is the only way to remove oil, and anode electrolytic oil removal is seldom used. Because the zinc element in zinc alloy is very active, hydrogen will be produced in the cathode during electrolysis, and reduction reaction will take place to protect the zinc alloy workpiece; while oxygen will be produced in the anode and oxidation reaction will occur, which may cause corrosion or pitting corrosion to the zinc alloy workpiece.
 
 
 
In fact, zinc alloy degreasing can be carried out by anodic electrolysis. Moreover, the use of anode electrolytic oil removal will be more conducive to ensuring the quality of electroplating, preventing hydrogen embrittlement and avoiding foaming problems.
 
 
 
How can zinc alloy electroplating remove oil by anodic electroplating? The key lies in the following aspects of control:
 
 
 
1. Choose less corrosive material to avoid corrosion or discoloration of zinc alloy in the process of electric oil removal.
 
 
 
2. Controlling the temperature of electric oil removal well, the general temperature can be controlled at 40-50 degrees Celsius, too high/too low is not conducive to the effect of oil removal.
 
 
 
3. Controlling the current of electric oil removal well. When using anode electric oil removal, the voltage is generally not higher than 6V, and the current density is generally 1~3A/DM2.
 
 
 
4. The distance between cathode and anode and the proportion of anode area, cathode area: anode area = 0.8-1:1, and the length of cathode plate is about 10 cm shorter than that of anode.
 
 
 
5. The time of oil removal by anodic electrolysis should not be too long. The general time should be controlled within 30-60 seconds. Too long time may also cause corrosion of the workpiece.
 
 
 
As far as the degreasing effect is concerned, because the hydrogen produced by the cathode is twice as much as the oxygen produced by the anode, the degreasing effect of the cathode electrolysis is better than that of the anode electrolysis. However, cathodic electrolysis also causes metal impurities in the cell to adsorb on the surface of the workpiece, which increases the problems of foaming and pitting of the workpiece after electroplating. Anodic electrolysis is a stripping effect, which can strip the particles adsorbed on the workpiece, but will help to reduce the burr/pitting problem.
 
 
 
The choice of any process has two sides. The key lies in the control of process and the choice of material.