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Corrosion Protection of Stainless Steel by Double-Layered Oxide Films
Masuda, Masataka,Sakamoto, Hirotoshi,Harada, Kohichiro,Hayashi, Yasunori 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.5
Double-layered oxide films of different pH_pzc (pH for point of zero charge) were deposited on stainless steels using RF magnetron sputtering. Anodic polarization measurements in buffer solutions were employed to evaluate the effect of oxide films on the films. The test solution pH was adjusted between the values of pH_pzc of both oxides, so one oxide had positive surface charge and the other had negative surface charge. The corrosion behaviors of coated steels were affected by the stacking order of oxide films. The higher pitting resistance was obtained for the specimens of stacking lower pH_pzc oxide film as an over layer than an under layer. This was explained by the reason that surface charge of the oxide films affected migration of ions in the corrosive solution. We proposed new method of measuring pH_pzc of oxide film with electrochemical AFM (Atomic Force Microscope). The Coulomb force cause by surface fixed charge was detected with AFM in the test solution. This force was varied with the solution pH, and showed minimum value of pH_pzc of oxide film. We showed the oxide double-layer of suitable staking order enhanced remarkably the corrosion resistance of the stainless steels.