Post-treatment of gun color coating of vacuum coating equipment

The post-processing of the gun color coating of the vacuum coating equipment, and the following processing after cleaning after plating.

The post-processing process flow is as follows: gun color-passivation-hardening film-coating coating.

1. Passivation Improve the corrosion resistance of the coating and stabilize the color of the coating. There are two methods of passivation: chemical passivation and electrochemical passivation. The chemical method is easy to operate and the electrochemical method has good effect.

(1) The chemical passivation formula is as follows:

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Chromic anhydride 40～60g/L temperature room temperature

Acetic acid l～2ml／L Time 20～60s

(2) The formula of electrochemical passivation (the plating is hung on the cathode) is as follows:

Potassium dichromate 8～12g／L Cathode current density 0.2～0.5A／din2

pH l2.5 (adjusted with sodium hydroxide) Time 30～40s

Temperature 60～70℃

2. Hard film Aging coating to improve the wear resistance of the coating. After the coating is passivated, it is washed, placed in an oven, and baked at 100°C for 15 to 30 minutes.

3. Coating with overcoat paint to extend the service life of gun color coating. For some low-grade plated parts, drying is sufficient. You can also apply a little oil.

If the plated parts have to go through multiple assembly or higher grades, or are often rubbed during use, they must be covered with a layer of varnish. The varnish can be acrylic varnish or polyurethane varnish, etc., and can be dipped or sprayed. For higher-grade plated parts, cathode electrophoretic coating must be used, the paint film is smooth and even, and the brightness is good.

Vacuum coating machine, coating equipment—Zunhua Baorui Titanium Technology Co., Ltd. Professional vacuum equipment manufacturer