Water adsorption behavior and kelvin potential change on metal surfaces

Abstract

Atmospheric corrosion and in-door corrosion are the types of corrosion which is expedited under thin water film and are observed on various kinds of metal structures and equipments. Too many factors controlling these phenomena have hindered us from looking into the corrosion of steel under thin water film. Then, water adsorption onto material surfaces and kelvin potential change as a function of relative humidity were investigation for pure iron, SUS304, Ni and Cr. It is thought that clarifying those phenomena makes it possible to more clearly understand a corrosion behavior under thin water film. Water adsorption increases with RH. And hydroxyl groups are influencial for water adsorption on metal surfaces. Moreover, Kelvin potential for metal is understood to fall with water adsorption. Observing changes of water adsorption and Kelvin potential behavior, on metal surfaces can afford to make access to fundamental understuding of atmospheric corrosion.