Adsorption of Sodium Oleyl Sarcosinate on Zinc and Its Passivating Action in Neutral Aqueous Solution

Resumo

The adsorption, protective, and passivating effect of some sodium salts of higher carboxylates and sodium dioctyl phosphate on zinc in borate buffer solution with pH of 7.4 were studied. It has been shown that sodium oleyl sarcosinate has the best protective and adsorption properties. It has been established that the adsorption of oleyl sarcosinate on zinc is multilayer, which contributes to its best protection under anodic dissolution and in a humid atmosphere with periodic condensation of moisture on the samples. Treatment of Zn in aqueous solutions of inhibitors increases the time until the appearance of the first corrosion lesions on it under conditions of humid atmosphere 2.5–4.5 times.