Treatment Of Grey Hair On Plastic Electroplating-electroplated Chromium Coating

Treatment of grey hair on plastic electroplating-electroplated chromium coating.
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In the production of electroplating decorative chromium, it is often encountered that the set of chromium layer is blooming, and the chromium coating is gray without metallic luster, but the lower nickel coating surface is normal after the chromium coating is removed. The main reasons for this fault are as follows: (1) the chromium cover of the bright nickel layer itself is poor, in which the additive of bright nickel plating has an effect on the chromium cover of the nickel coating. If the cleaning property of the bright nickel plating additive is poor, it will lead to dirty cleaning of the residual additives on the surface of the parts, and the chromium layer will bloom after the part is sheathed with chromium. (2) the nickel plating layer is passivated before the cover of chromium, which is due to the long cleaning time after nickel plating.
The methods to deal with this fault are as follows: selecting bright nickel additive with good chromium property; adding electroplating matte nickel or impact nickel after bright nickel plating (no gloss agent is added in the nickel plating bath, plating time can be controlled at not affecting the bright appearance of bright nickel). Matt nickel has excellent cleaning and chromaticity due to the absence of additives, and a cleaning process is added after bright nickel to ensure clean cleaning. At the same time, attention should be paid to shorten the cleaning time to prevent the passivation of the nickel layer, and increase the nickel activation process before chromium plating to activate the nickel coating, which can be activated by chemical activation and electrochemical activation. In addition, attention should be paid to the fact that the residence time of each slot in the electroplating automatic line can not be adjusted, which may lead to the long residence time of the parts in water after plating bright nickel, and lead to the problem of blooming on the surface of nickel coating after passivation of chromium sleeve. The NaHC03 of 0.59/L~l9/L can be added to the water tank for a long time to avoid nickel surface passivation.