Abstract：The traditional organic chromium-free passivation product has a serious yellowing change at 400 ℃. On the premise of maintaining excellent high-temperature resistance, it also has excellent corrosion resistance and processing performance. A chromium-free passivation product using inorganic and a small amount of organic was designed for aluminum plating. The methods of electrochemical workstation, X-ray photoelectron spectroscopy, X-ray fluorescence spectroscopy and infrared spectroscopy were used. The film forming mechanism of the chromium-free passivation on the surface of the hot-dipped aluminum sheet was studied, and the interfacial bonding mechanism between the skin film and the aluminum-silicon coating was analyzed by combining the film forming kinetics analysis. The effects of film weight and curing temperature on the technological properties of the aluminized sheet were studied. It was concluded that the control range of film weight with excellent comprehensive properties was 0.8-1.2 g/m2, and the corresponding PMT temperature was above 80 ℃. The chromium-free passivated hot-dip aluminized sheet had excellent high-temperature resistance, corrosion resistance and stamping performance. The surface chromatic aberration ΔE was less 3 after baking at 400 ℃ for 2 h and the neutral salt spray test for 72 h did not show rust.
王滕, 柴立涛, 李伟刚. 镀铝板用耐高温型无铬钝化结合机理及性能[J]. 中国冶金, 2019, 29(12): 45-50.
WANG Teng, CHAI Li-tao, LI Wei-gang. Bonding mechanism and technological properties of high temperature resistant chromium-free passivation coating for aluminized sheet[J]. China Metallurgy, 2019, 29(12): 45-50.
2019, Vol. 29 
