Vapor-Phase Protection of Zinc from Atmospheric Corrosion by Low-Volatile Corrosion Inhibitors

Abstract

The atmospheric corrosion resistance of metals can be reached by the formation of ultrathin protective films on their surface. Over recent years, a fundamentally new feasibility of the nanodimension films on metals capable of ensuring high atmospheric corrosion resistance of metals at least for the period of transportation and in-process storage of the metals was studied. The method of formation of such films by semivolatile nontoxic compounds capable of being adsorbed on metal surface from gas phase at increased temperature (chamber inhibitors) was proposed for this purpose. It is based on the use of such low-volatile organic inhibitors, which are prone to chemisorption on protected metal, and, as a consequence, can provide the stability of the adsorbed layers and long protection after-effect. It was shown by the complex of accelerated corrosion, electrochemical, and optical techniques that the treatment of zinc by vapors of low-volatile corrosion inhibitors at increased temperature and suitable compilation of the reagents results in the formation of the adsorption film with the effect of the long protection after-effect.