Comportamento corrosivo de aços inoxidáveis utilizados como revestimentos em refinarias de petróleo

Abstract

In the petroleum processing industries we use different chemical, physical or biological process and break them down into a serie of separate and distinct steps called unit operations. The most important method of separating petroleum is distillation, and hence the products should be compared with one another in the order of their boiling ranges. Corrosion cost refiners thousands of dollars each year. Sulfide and acid corrosion, atmospheric oxidation, naphtenic acids, and high temperature oxidation are the principal mechanisms involved in the corrosion process. Stainless steels are commonly used in high temperature applications in order to exploit the economic advantages they offer, together with their generally good oxidation resistance. This work depicts results the corrosion resistance of AISI 444 stainless steel in national heavy crude oil. The nature of the corrosion was analyzed by Scanning Electron Microscopy (SEM) and X-ray dispersion(EDAX).