Academic Research of the Protective Ability of Zinc-Filled and Epoxy Polyamide Paint Coatings against Atmospheric and Soil Corrosion

Abstract

Currently, zinc-filled coatings capable of providing protection against corrosion through a barrier and tread mechanism are becoming increasingly widespread. When exposed to an aggressive environment, the coating prevents steel corrosion by “healing” the damage. In this way, the corrosion process slows down, and the by-products formed during the activation of zinc are able to fill the space left by the defect. The article presents a description of the principle of “healing” with such coatings, as well as the results of laboratory and field tests carried out in order to study data on the effectiveness of protective characteristics in comparison with the traditionally used epoxy polyamide coating with parallel operation of electrochemical protection. It was noted that laboratory tests confirmed the “restorative ability” of the zinc-filled coating to prevent the formation of corrosion in places of applied defects.