Abstract
In this work, a self-designed stray current simulated system was employed in corrosion evaluation test, and the effect of stray current on corrosion behavior of Mg alloy was investigated. The anti-corrosion performance of Mg alloy directly related to its corrosion film. The corrosion film covered on Mg surface was incomplete, which was a mixture of porous MgO + Mg(OH)2, and the corrosion happened on the bare Mg substrate at the rupture of corrosion film. The pitting corrosion randomly occurred on α-Mg, and the anodic hydrogen evolution (AHE) further damaged the corrosion film. With the extension of time, the pits developed into severe localized corrosion and the corrosion rate was accelerated. The stray current was composed of direct current (DC) and low-frequency alternating current (AC), which promoted the rupture of corrosion film, hence the stray current significantly accelerated the corrosion rate of Mg alloy.
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