Plastic plating-influence of bath composition and plating process specifications

Plastic plating-influence of bath composition and plating process specifications.
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Influence of Bath composition and Electroplating process specifications.
1. Zinc oxide and cobalt sulfate are the main salts. The content of cobalt sulfate in the bath has a great influence on the content of cobalt in the coating, and the content of cobalt in the coating increases obviously with the increase of the content of cobalt sulfate. In order to keep the cobalt content within the required range, the cobalt sulfate content in the plating bath must be strictly controlled within the process range.
2. ZC stabilizer. The main purpose of the addition of stabilizer is to prevent the formation of cobalt hydroxide, which has a certain complexation effect on cobalt ion, and the cobalt content in the coating decreases with the increase of additive content.
3. Additives. The main purpose of the additive is to improve the cathodic polarization. The inhibition effect of ZCA additive on Co2+ discharge is greater, and the cobalt content in the coating decreases with the increase of additive content.
4. Working temperature. The cobalt content in the bath increases with the increase of bath temperature.
5. Current density. The cathodic current density has little effect on the cobalt content of the coating, but it tends to increase slightly, and the deposited cobalt content will increase slightly due to the increase of current density and polarization.
6. Anode. In alkaline zincate plating bath, the concentration of zinc ion is not easy to control, because the dissolution efficiency of zinc anode in normal activation state is 100%, and zinc has the characteristic of autolysis in alkaline solution, so the dissolution efficiency of zinc anode is more than 100%. However, the deposition efficiency of the cathode is only about 60%, so the concentration of zinc ion tends to increase in the electroplating process. The usual measure is to change the area of zinc anode, that is, to reduce the area of zinc anode, so that zinc anode can be easily passivated and can not continue production. It is best to use the method of mixing soluble anode and insoluble iron anode to maintain a certain area ratio of zinc anode to iron anode to control the current density on zinc anode and then to control the concentration of zinc ion in the bath. In addition, when using zinc and iron mixed anode, the autolysis of zinc anode is very serious when stopping plating, so attention should be paid to taking the zinc anode out of the solution when stopping plating.