Contingency of the Destruction of Metals in Petroleum Oils

Abstract

Petroleum oils are multi composite earth resources including various corrosive compounds that able to cause the metallic corrosion. The investigations of the impacts of such corrosive compounds of petroleum oils on the corrosion of seven types of ferrous metals were the objectives. According to the methodology the chemical compositions of metals and the basic corrosive compounds presences in both petroleum oils were measured. The set of metal coupons with similar dimensions was prepared by the seven different types of metals and such metal coupons were immersed in both crude oils and after certain time periods the corrosion rates of such metal coupons were determined by the weight loss method with the microscopic analysis of the metal surfaces. The decayed ferrous and copper concentrations from metals and the variations of the initial hardness of metals were measured. As the results there were observed the relatively lower corrosion rates from stainless steels especially with the ~12 % of chromium with sufficient amount of nickel, higher corrosive impact from salts, formations of the FeS, Fe2O3, corrosion cracks and pits, higher decay of copper and ferrous from some of metals and the slight reductions of the initial hardness of metals due to the corrosion.