Effect of pH on Oxygen Corrosion At Elevated Pressures

Abstract

Abstract A summary study of oxygen corrosion of mild steel in brine is presented. Corrosion rates were determined for oxygen pressures ranging from atmospheric to 515 psia and over a pH range of 1-13.5. All tests were conducted at room temperature (24 C). It is shown that corrosion rates are generally increased with increasing oxygen pressure and decreasing pH; however, when tests exceeded 6 hours duration, an accelerated corrosion developed over the pH range 8–12. An unusual filamentary type corrosion product develops and grows in the 300–500 psi oxygen pressure range in pH 12 system. The identification and proposed mechanism of growth are given. 3.4.6