抄録
Protective films produced on steel surface in 5% NaCI solution containing several inorganic inhibitors were investigated by electron diffraction method.
Although corrosion depends on the condition of the solutions, in a certain range of concentration, each solution showed appreciable inhibiting effect especially with Na2HPO4 and ZnSO4.
In general, surface product is γ-Fe2O3. H2O with underlying γ-Fe2O3. Hydroxide could not be recognized; only in Na2HPO4 solution, yellowish white precipitate ofcolloidal Fe(OH)3 was observed.
The process of corrosion and inhibitation in these solutions is considered as follows;
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Depending on whether the equilibrium point is on the right side or on the left, passive or active state of steel surface is determined.
