PAS300 is a completely hexavalent chromium-free black passivation agent suitable for black passivation of acid and alkaline zinc-nickel. It can produce good adhesion with subsequent organic or inorganic sealer layers. When used with a black sealer, a uniform black passivation film can be obtained, greatly improving the corrosion resistance and heat resistance of zinc-nickel alloy coatings. It meets the high-quality requirements of the market for electroplating products, thereby enhancing the competitiveness of enterprises. The operation is simple, easy to maintain, and has excellent cost performance.
