The quality analysis of the anti-corrosion coatings metal structures operating in difficult conditions

Abstract

Abstract The simplest and most reliable way to protect metal structures from corrosion are the paint coatings, which, in comparison with other protection methods, have several advantages (manufacturability, maintainability, economy, compatibility with other protection methods, etc.). The issues of experimental quality analysis of the typical anticorrosion coatings designed to protect metal structures operating under aggressive environmental conditions and industrial factors are considered. It is proposed to use such indicators as adhesion, thickness and weather resistance as the main indicators of the coatings’ quality. The methods for the experimental determination of these parameters on the laboratory samples and the construction of an integral indicator of the anti-corrosion coatings quality are proposed. On the selected typical coatings example, the experimental dependences of their quality indicators on temperature, the number of “freezing-heating” cycles, the magnitude of the shock load and the water salinity degree are analyzed. The obtained data were used to determine the weather resistance of coatings and their quality indicator, which was proposed to use as the sufficiency integral indicator. Its essence lies in the assumption that there is a border beyond which an increase in the indicator is pointless for each of the quality indicators, since it does not lead to an improvement in the coating quality and can even be harmful due to the other uncontrolled indicators’ possible deterioration.