THE INFLUENCE OF WATER CONCENTRATION ON THE CORROSION OF LOW ALLOY STEELS IN THE SYSTEM METHANOL – ETHYLENE GLYCOL – MALONIC ACID

Abstract

The behaviour of three type of steel, with a variable carbon concentration (from 0.20 to 0.40%) is studied in medium of methanol – 10% ethylene glycol – 5% malonic acid with water concentration varying between 1% to 5%. The weight losses are measured; also the polarisation curves are plotted and the corrosion parameters are established. SEM visualized the metallic surface. The corrosion compounds are analysed by IR spectroscopy, X-ray diffraction and chemical analysis.