Application of inhibitors for anti-corrosion protection of forest machines

Abstract

Modern forestry machines are operated in various climatic conditions, characterized by sudden temperature changes, high humidity, and dustiness. The impact on the paint coatings of an aggressive environment leads to their destruction and the occurrence of corrosion processes on the surface of the equipment. The purpose of this work was to improve the protective properties of paint coatings by introducing organic corrosion inhibitors into them. For testing, flat samples of sheet steel St.3 were used, 140x70 mm in size, 0.8 – 1.0 mm thick with a clean surface. The studied paintwork consisted of ML-152 enamel with inhibitors introduced into it. The following organic compounds were studied as inhibitors: 6-(paminobenzenesulfamido)- 2,4-dimethoxypyrimidine, p-aminobenzenesulfaguanidine, 2-(p-aminobenzenesulfamido)-thiazole, 2-(p-aminobenzenesulfamido)-4,6 dimethylpyrimidine, benzotriazole . Using visual and electrochemical methods, water extracts from a polymer coating with additives introduced into it, the corrosion resistance of steel samples with applied paint coatings with additives, and the electrical insulating properties of paint coating films were studied. As a result of the work carried out, it was shown that water extracts from a polymer coating based on ML-152 enamel, with additives introduced into it, have a corrosion-inhibiting effect. It has been established that the additives introduced into the ML-152 enamel increase the anodic polarization of the samples and slow down the electrode processes on the metal during the entire exposure time. The studied additives increase the resistance of polymer films up to 1.8 Ohm. The most effective additives that slow down corrosion when they are introduced into ML-152 enamel are 2-(p-aminobenzenesulfamido)-thiazole and 2-(paminobenzenesulfamido)- 4,6 dimethylpyrimidine.