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Effects of Pigment Composition on Corrosion Protective Property of Various Ferrite Paint Films

The corrosion protective property of modified iron oxide pigments was investigated by impedance measurements, corrosion weight loss tests, and IR absorption spectrum analyses. Pigments were calcined in three mixture ratios of metal oxide (MO, M=Mg, Ca, Zn) and iron oxide (a-Fe2O3). Namely the mole compounding ratios of MO and a-Fe2O3 are 3:7, 5:5, 7:3. From the impedance measurements of paint films composed of boiled linseed oil and these pigments, the paint film containing pigment of ZnO+ZnO Fe2O3 indicated a high film resistance (Rf) of about 107tcm2. In the weight loss test, the steel was inhibited in the extracted solution. So it was found that the pigment was good corrosion protective pigment. But the pigment containing too much Mg or Ca led the paint film to the deterioration. The deterioration of paint film containing pigment of MgO+MgO Fe2O3 did not depend on pigment concentration, and it is suggested that the decrease of adhesion at the paint film/substrate interface is based on the excess formation of metal soaps. From the values of R f, the pigments used in this work were superior to simply mixed powder in the same composition.