Mr. Liu, a factory owner in Xingtai, Hebei, operates a plating factory ranked among the top ten in local production scale. His production line primarily focuses on the processing and manufacturing of automotive parts. The automotive parts undergo zinc plating followed by black passivation treatment, requiring the workpieces to possess excellent adhesion and corrosion resistance. Recently, Mr. Liu has encountered issues where the black passivation film on his automotive parts tends to peel off after baking, resulting in poor corrosion resistance. Consequently, Mr. Liu is considering switching to a trivalent chromium-based black passivating agent with superior adhesion properties.
Mr. Liu found Bigely's black passivator BZ-216 by searching for "trivalent chromium black passivator" online and consulted engineers in detail about the characteristics of this product. After understanding Mr. Liu's performance requirements for the workpiece, the engineer recommended that he use this black zinc passivator BZ-216 in combination with a sealing agent. The black zinc passivator BZ-216 can produce a dense black passivation layer on the galvanized layer of the workpiece, ensuring good adhesion of the workpiece coating; When used together with a sealing agent, the workpiece can pass the neutral salt spray test for more than 72 hours, which fully meets Mr. Liu's performance requirements for automotive parts.
Mr. Liu compared several renderings of BZ-216 and, after inquiring about the product price, directly purchased 1 barrel of passivator BZ-216 and 1 barrel of sealing agent. A week later, Mr. Liu replied to the message saying that after using this black passivator, the appearance of the workpiece became darker and brighter than before, and the coating would not peel off again. The workpiece had good salt spray performance, and the customers were quite satisfied. So Mr. Liu and Bigely signed a procurement contract.
So, after galvanization and black passivation of automotive parts, it is easy for the film to peel off and the corrosion resistance is poor. You can try using the trivalent chromium black passivation agent BZ-216 from Bigely to ensure that the performance requirements of the workpiece are met. If you are also looking for a trivalent chromium black passivator with good adhesion, you can contact Bigley customer service for free samples and detailed technical information!
