2016 Volume 65 Issue 4 Pages 120-126
Electrochemical measurement methods under thin electrolyte films are described and the applications to atmospheric corrosion studies are introduced. Firstly, oxygen reduction mechanism under a thin solution film is provided on the basis of cathodic polarization curves obtained under electrolyte films of various thicknesses. Dependencies of corrosion rates for carbon steel, stainless steel and copper on the thickness of the solution film are also discussed on the obtained EIS under thin films. Secondly, corrosion monitoring results of carbon steel and stainless steel exposed to cyclic wet and dry conditions are presented and their corrosion mechanisms are briefly described. Finally, atmospheric corrosion monitoring in actual atmospheric environments is introduced and the relation between atmospheric corrosion rate and environmental factors such as relative humidity and airborne sea salt is discussed.