In the process of using zinc-nickel alloy natural color passivator, when there is a problem with the passivation film, such as blue passivation film, is this caused by the bad use of passivator? Actually, it's not. Maybe it's the bath.
Mr. Jiang is the owner of a processing plant in Dongguan, Guangdong Province, which specializes in electroplating zinc-nickel alloy for various standard fasteners. Recently, Mr. Jiang plated zinc-nickel alloy workpieces with bluish surface during passivation, which seriously affected the appearance and performance of the workpieces. So Mr. Jiang asked Bigely to help him solve this problem.
Engineers rushed to the scene, according to the field experience and the product zinc-nickel alloy brightener BZ-617 and zinc-nickel alloy natural color passivator Zn-325 characteristics, after checking the production line production, found that there is no problem with Mr. Jiang's passivation solution, and the problem is in the plating solution. Originally, it was due to Mr. Jiang's production line operator did not control the nickel ions in the plating solution, resulting in high zinc and low nickel in the plating solution, the zinc content in the alloy plating layer is too high, so that the passivation film will appear blue or brown when the passivation is carried out in the native color.
So the engineer trained the operation master, the plating solution should control the concentration of nickel ions, the concentration of nickel ions should be analyzed in time during the production process, and add nickel additives appropriately, so that the alloy plating layer in order to obtain a stable nickel content; but also to control the proportion of zinc and nickel ions in the plating solution, the general zinc/(zinc+nickel) concentration ratio of 0.15-0.17 and the total concentration of zinc and nickel ions in the range 0.17-0.40mol/L, you can get about 13% zinc-nickel alloy plating layer. 0.40mol/L, you can get about 13% zinc-nickel alloy coating. After Mr. Jiang adjusted the plating solution under the guidance of the engineer, there was no bluish phenomenon after the workpiece was passivated in its original color.
Therefore, in the production process of electrogalvanized nickel alloy, the surface of the passivation film is prone to blue phenomenon after the natural passivation of the workpiece, not that this zinc-nickel alloy natural color passivator is not good, but to analyze the plating solution and make timely adjustments. If you are interested in zinc-nickel alloy natural color passivator, please contact Bigely customer service for free samples and detailed technical information!
