Effects of Ti Interlayer on Corrosion Resistance and High Temperature Oxidation Resistance of Aluminized Steel Sheets

Aluminized steel sheets are widely used because they combine good corrosion resistance and high-temperature oxidation resistance. Al/Ti double-coated steel sheet having a Ti interlayer, offers even better properties due to the electrochemical and metallurgical properties of titanium. Specifically, since the rest potential of Ti in neutral NaCl solution is more noble and exhibits better cathodic polarization than the steel, the steel is protected cathodically for a long period because the sacrificial dissolution of Al is prolonged, thereby preventing reversal of the electrochemical potential between the Al and the steel. Ti also exhibited a good barrier effect on the thermal diffusion of Fe, depressing the high-temperature oxidation of the steel.