Effect of Silanization Treatment Process Parameters on Corrosion Resistance of 6061 Aluminum Alloy for Building

Silane coating was prepared on the surface of 6061 aluminum alloy profiles by silanization treatment process. The optimization of silane treatment process was studied. The corrosion resistances of 6061 aluminum alloy before and after silane treatment in 0.025 mol/L sodium borate + 0.05 mol/L sodium hydroxide mixed solution were compared and analyzed by electrochemical performance test method. The results show that the optimized silylation process of 6061 aluminum alloy was silylation time 180 s, silane solution pH 11, curing temperature 90 ℃. The thickness of silane coating obtained by the optimal silanization treatment process was about 90 nm, and the coating was uniform and dense, which had good bonding with the aluminum alloy substrate. The corrosion resistance of 6061 aluminum alloy after silanization treatment was obviously better than that before silanization treatment. The impedance value of the sample increased obviously, the surface contact angle decreased and the adhesion work increased.