On the resistance of aluminized steel in high temperature water

Abstract

Due to its high anti-corrosion properties under room temperature and also to its high thermal resistance, the applications of aluminized steel has remarkably been increased in recent time. On its resistance to corrosion in high temperature water, however, no study has so far been made. If its high resistance in high temperature water is proved, it is well considered that the aluminized steel will get more promissible as a material for boilers, vessels for some chemicals and others.In this connection, by use of aluminized steel plates which have deferent chemical compositions, an experiment has been made for studying on their resistance to corrosion in high temderature (250°C) distilled and city water respectively by way of measuring the degree of corrosion, electrode potential, X-ray diffraction and so on.The findings are as follows:1) The degree of corrosion in primary stage is different according to the chemical composition of base steel.2) The corrosion resistance of the material in the distilled water at 245°C is little different from that in the city water at same temperature.3) The corrosion film formed on the surface of the material is mostly composed of Bohmite (α-Al2O3·H2O), but Diaspore(β-Al2O3·H2O) is also formed a little both in distilled and city water at the temperature of 245°C.