(v12preprint12)Effect of Pretreatment with Benzotriazole on the Corrosion of Copper in Sulfide Polluted Salt Water

摘要

Copper undergoes extensive general and intergrannular corrosion (IGC) in sulfide polluted salt water. On the other hand, when copper was pretreated for one hour in the presence of 10 mM benzotriazole (BTAH) under a mild oxidizing potential, only localized corrosion occurred at the grain boundaries while the grain surfaces remained well protected. Under this condition, sulfur was detected using energy dispersive spectroscopy (EDS) at the grain boundaries, but not on the grain surfaces. X-ray photoelectron spectroscopy revealed the presence of sulfide ions and BTAH on the corroded surface. This pretreatment resulted in a protection efficiency of about 92%.