Corrosion Resistance and Corrosion Behavior of Aluminized Steel Sheet under Salt Corrosive Environment

Abstract

The effect of conditions of corrosion test and nature of corrosion product on corrosion resistance of aluminized steel under salt corrosive environment was studied. We obtained the following result.
(1) In continuous salt spray test condition, corrosion rate is high because of bulky corrosion product which was mainly constituted by boehmite (γ-AlOOH) and bayerite (β-Al(OH)₃).
(2) In condition which salt spray test and humidity cabinet test was repeated reciproally, fine and amorphous corrosion product was produced. Because it acts as a protection film which restrain the cathode reaction, corrosion rate is restrainted remarkablely.