Abstract
In the chemical industry, 2507 duplex stainless steel is usually used for the pipes of absorption tower. The residual F− and Cl− in the tail gas could aggregate in the clean solution of ammonium hydroxide, which causes the risk of pitting corrosion. In this study, the role of Cl/F ions concentration, pH and temperature on the pitting corrosion of 2507 stainless steel is investigated by exposing to actual industrial ammonia desulfurization solution. The experimental results reveal that the 2507 stainless steel exposed the serious corrosion solution appears pitting corrosion problem. However, the 2507 stainless steel is free of pitting corrosion at the tested condition of pH value 3.59/5, temperature 80 °C/100 °C, and ion concentration 46375 ppm/80000 ppm. This study provides a fundamental data for the safety service of stainless steel used in chemical industry.
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