Passivation agent

Ⅰ, Features: 1, aluminum and aluminum alloy workpieces can obtain a homogeneous colorless chemical conversion film (passivation film thickness of about 30-150mg / m). It has excellent corrosion resistance and decorative, with excellent ability to prevent discoloration. 2, DA-01 chemical passivation agent is a clear colorless liquid, zirconium, silicon main salt, a film promoting agents, stabilizers, pH adjusting agent composition, free of chromium, lead, cadmium and other harmful organisms, specific gravity: 1.03-1.04, pH value ≤1.0, it is an environmentally friendly product. 3, the chemical conversion coating with a solid, can significantly enhance the binding force of the workpiece and the coating and paint. 4, at room temperature or low temperatures, bath detection simple, easy operation and management. Bath preparation method is simple, stable performance and long service life. High efficiency, low overall cost. Ⅱ, the concentration of the formulation ingredients and process conditions DA-01 1.0-1.2% (V / V) pH 2.6-3.8 temperature normal time 30-60 seconds Ⅲ, the process workpiece → washing → degreasing → washing → washing → passivation → washing → hot air drying (80-120 ℃) ??to maintain and replenish Ⅳ, bath in the production process, should regularly analyze conductivity and pH of the bath when the bath conductivity lower than 800μ s / cm, or when the pH is higher than 3.5, it should be added to DA-01.