Electrochemical Studies on the Performance of Zinc Used for Alternating Current Mitigation Available to Purchase

In this work, the performance of zinc under alternating current (AC) with a decoupler was investigated in 4 g/L Na₂SO₄ simulated backfill solution by weight loss tests, electrochemical measurements, scanning electron microscope analyses, and x-ray diffraction examination. The results showed that zinc corrosion was accelerated under AC. As a result of the effects of AC, the corrosion product film deposited on the zinc surface increased first and then was destroyed gradually by AC oscillation. The ratio (AC current efficiency) of weight loss caused by AC to that caused by an equivalent steady-state direct current density was calculated. The results indicated that AC current efficiency was no more than 1.7% at AC current density of less than 300 A/m² and it reduced with the decrease of AC current density.