We use decorative chrome additives to formulate the tank solution after the film, the better chrome plating solution should have 7~8cm bright range of plating, no burnt ash in the high end, and no yellow film or color film in the low area. But in the actual production, there are always some failures, what are the causes of such failures? And how to adjust?
If after flaking, the bright range of the coating is narrow, and the plating solution is thicker (you can measure the specific gravity and check the table to estimate), and there is no yellow film in the low area, it is usually caused by too much sulfuric acid. This is a relatively common problem.
Because when chromium plating using recycling (generally two poles) measures, sulfate will only increase and not decrease. The reason is that when chromium plating chromic acid is constantly consumed (industrial chromic anhydride is allowed to contain sulfuric acid 0.4%) and sulfuric acid is only brought out for the loss, and most of the sulfuric acid that is brought out in the replenishment of recycled water back to the plating solution, it will accumulate and increase.
When using chrome plating additives, if this situation is encountered, our technical engineers will suggest that the plating plant can slowly add a small amount of measured barium carbonate or barium hydroxide under constant stirring, and then plating after stirring (note that the liquid temperature should be at the original test temperature). Add until no yellow film appears in the low area just before. Generally the bright range will be significantly widened.
If excess sulfuric acid alone causes a narrow range of brightness in the plated layer, add a large tank at approximately 70% of the amount tested to precipitate the excess sulfate.
About us
Guangdong Bigely Technology Co., Ltd. ,founded in 2003, is a high-tech enterprise integrating R & D，production, sales and service, specializing in the production of electroplating additives. As a famous electroplating additives source manufacturer in China, Bigely has over 20 years' experience in electroplating additives production and own production base of 5000 square meters. We can produce 15,000 tons of electroplating additives every year, which can fully meet the needs of customers.
If you need our high-quality electroplating additives, please contact us. We can provide you samples for test, and also provide a series of services.
