金属材料に形成する不働態皮膜の成長・破壊理論

抄録

Most of corrosion-resistant metals, such as Ni, Cr, Al and Ti, are covered with their passive films, whichprotect the metal from environment-assisted degradation. However, the metals sometimes suffer localizedcorrosion, such as pitting and crevice corrosion, in the specific environments. The passive film, which alsoaffects the adhesiveness of the paint to the metal and the property of corrosion to the metal under the paint, isso thin that the detailed properties of it have still been unclear. This report aims to introduce the Point DefectModel which is one of the theories for formation and breakdown of the passive film of the metal, and proposedand developed by Macdonald and his group. In addition, this also shows the meaning of the potential scanningused in the potentiokinetic method for obtaining a breakdown potential of the film.