Corrosion behavior and electrochemical property of Q235A steel in treated water containing halide ions (F⁻, Cl⁻) from nonferrous industry

Abstract

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.

Keywords

simulated water / halide anions (F⁻, Cl⁻) / Q235A steel / corrosion behavior / electrochemical property

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