Corrosion behavior and electrochemical property of Q235A steel in treated water containing halide ions (F−, Cl−) from nonferrous industry
Yun-yan Wang , Yong-jian Luo , Hui Xu , Hai-juan Xiao
Journal of Central South University ›› 2020, Vol. 27 ›› Issue (4) : 1224 -1234.
Corrosion behavior and electrochemical property of Q235A steel in treated water containing halide ions (F−, Cl−) from nonferrous industry
The corrosion behaviors and electrochemical properties of Q235A steel in the treated water containing corrosive halide anions (F−, Cl−) have been investigated with corrosion tests of static coupon and dynamic coupon testing, electrochemical measurement of open-circuit potential and linear sweep voltammetry. The results reveal that the existence of F− and Cl− ions in the simulated treated water accelerate the corrosion rate of Q235A steel. The corrosion rate reaches maximum with F− concentration of 50 mg/L, Cl− concentration of 200 mg/L, respectively. However, Q235A steel would passivate when an applied potential is added to the system. Meanwhile, the initiating passive potential becomes positive with F−, Cl− concentration increasing. There is a little influence of F−, Cl− concentration on the initiating passivation current density. Therefore, it is necessary to control F−, Cl− concentration in the treated water when it is recycled by the pipelines made of Q235A steel.
simulated water / halide anions (F−, Cl−) / Q235A steel / corrosion behavior / electrochemical property
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