Corrosion of steel materials in four environmental conditions

Abstract

The corrosion of metal materials greatly affects the life of the equipment. Focusing on four typical environmental conditions, this paper takes steel material as the research object and analyzes the influence of factors (temperature, humidity, SO2, Cl- and others) on the corrosion rate of steel materials, as well as the weight loss and morphology. The results show that the atmospheric corrosion rate is 5.88-30.78 μm/A, and increases by 185% on average with the increase of Cl- concentration under road salt conditions. The static and dynamic corrosion rates show a three-step distribution. The concentration of chemical media in the liquid film accumulates, and the synergistic corrosion of multiple factors makes the corrosion rate much higher than the atmospheric corrosion intensity. The maximum corrosion rate under the static condition is the low latitude coastal condition (386 μm/a), and the dynamic working condition is the high latitude coastal working condition (85.6 μm/a).