October 2005

Corrosion/Vessels

Effect of process deposits on the corrosion behavior of titanium in brine

The temperature and pH need to be controlled to avoid problems

Babakr, A., SABIC R&T; Al Beed, A. A., Saudi Petrochemical Company; Al-Sonidah, M., Al-Subai, S., Saudi Basic Industries Corp.

Titanium alloy Ti-0.3Mo-0.8Ni (Gr-12) is used as the preferred material for anolyte vessels of brine solution due to its superb corrosion resistance. A vessel suffered severe localized attack (bottom of vessel), resulting in leakage in less than three years from the date of installation. The vessel bottom thickness was 4.76 mm and had undergone severe localized corrosion under the prescribed process pH and temperature. Samples were collected and analyzed. Large pits were revealed by optical microscopy. The deposits were analyzed by X-ray fluorescence (XRF). It was found that the main cause of failure was settled deposits, which led to under-deposit corrosion in high-temperature conditions.

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