Yoshihiro Hisamatsu and Masayoshi Kanno
The local cell polarization curves of mild steel in 10 percent sulfuric acid with and without inhibitor at the temperature 40° have been measured and presented by two indirect methods. The first is by the corrosion rate when a current from external source is applied, and the second is by the mixed potential and the breaks of the polarization curves when the external current is applied. Used inhibitors were mainly 0.5 percent diethylaniline. And it is shown, that the corrosion of steel under such conditions is controlled by both the anodic and cathodic polarizations of the local cell, the former being greater, and that the inhibitor affects both the anodic and cathodic polarizations of the local cell, the former being more strongly affected. This may be reasonably generalized to apply to many other organic inhibitors because most of them make the mixed potential nobler while the open circuit potential of the local anode is scarcely affected.
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