Corrosion Behavior of Stainless and Carbon Steels in High Temperature and Pressure Water Systems with Addition of Zr and Si Compounds

Abstract

The corrosion behavior of stainless and carbon steels in high temperature and high pressure (HT/HP) water systems with addition of Zr and Si compounds was investigated. The corrosion of stainless and carbon steels was inhibited by addition of a Zr compound. This is due to formation of a stable film by Zr oxide and then the increase of protective ability of the film. Only corrosion of stainless steel was depressed by addition of a Si compound. It is thought that this is owing to depression of outer-diffusion and dissolution of CrO₄^2- by adsorption of SiO₃^2- on a steel surface and then stabilization of the film containing a Cr component.