Influence of water on the behaviour of low-alloy steels in ethylene glycoland succinic acid organic media

This paper presents a study on three types of low alloy steels behaviour wi th the carbon content taking values from 0,2% to 0,4%, in an organic, syste m containing ethylene glycol, 5% succinic: acid and 1-5% water. From weight losses, the figures K(g/m(2).h) and P(mm/m(2) year) were calculated The me tallic surface was visualized by electronic microscopy and, for the system with 5% water concentration the anodic and catodic polarization curves were plotted. Also, the corrosion parameters were calculated. The corrosion com pounds with the composition determined by chemical analysis were characteri zed by X-ray diffraction and IR spectroscopy. A corrosion mechanism was ass igned. The main conclusion is that corrosion rate decreases with the increa sing of carbon content from the steel.