Structure and properties of protective films of oleic acid for contact and chamber protection of metals. 1. Magnesium

Using a complex of corrosion, electrochemical and physical methods, the structure and properties of protective layers of oleic acid (OlA) obtained by contact and chamber processing of magnesium were studied. It has been shown that the treatment of magnesium in a solution of OlK in isopropyl alcohol and in hot vapor of OlK leads to an increase in the corrosion resistance of the metal and inhibition of its anodic dissolution. Chamber processing (CT) is more effective compared to immersion. With both methods of processing magnesium, OlK forms protective films on the surface of approximately the same thickness, which, however, have a different structure. When magnesium is dipped into an OlK solution, rounded agglomerates are formed on it, almost merging with each other. In the case of CO, the surface films have a network structure. The protective effect of OLC is associated with the passivation of magnesium. However, during CO, passive films are characterized by high values of pitting potential and anti-pitting basis in chloride-containing electrolytes. Both options for inhibiting magnesium corrosion are characterized by a mixed blocking and activation mechanism. Moreover, in the case of CR, the activation mechanism dominates.