A customer inquired that during the use of chromium plating additives, some workpieces will bring nickel plating solution or cleaning water containing high concentration of chloride ions into the plating solution due to incomplete deplating in hydrochloric acid, resulting in fogging and blooming of workpieces.So how should the chromium plating solution deal with chloride ions?
According to the field experience and the characteristics of the chromium plating additive Cr-9, Bigolly Technology has made an analysis. When the chloride ion content in the plating solution exceeds 0.5g/L, the covering capacity and current density of the plating solution will be significantly reduced, the deposition rate of the chromium coating will be slower, and the coating is prone to fog and bloom.There are three main methods to deal with chloride ions in the plating solution:
1. Electrolytic method: heat the plating solution to 60~70 ℃, use 40~50A/dm2 current for electrolytic treatment, and the chlorine ion can be converted into chlorine gas and discharged.
2. Chemical treatment method: a small amount of silver carbonate can be added to the chromium plating solution to make chlorine ions react with silver ions to generate silver chloride precipitates and filter them out.
3. Natural volatilization. The natural volatilization of chloride ions from the plating solution is relatively slow. The plating solution can be heated and stirred to accelerate the decomposition of chloride ions.
Therefore, in the process of using chromium plating additives, when the chloride ion content in the plating solution is high, the above three methods can be used to deal with chloride ions, so as to solve the problem as soon as possible and reduce losses.If you are interested in chromium plating additives, please contact the Bigolly customer service for free samples and detailed technical information!
If you want to know more about chromium plating,you can check "Electroplating encyclopedia".