Abstract
The present work examines how passivating oxide film affects the corrosive wear rate of Al-7%Si alloy in H 2SO 4 solution at room temperature. As the applied potential (relative to a saturated calomel electrode (SCE)) increases to 1.08 V SCE on an Al-7%Si alloy specimen, the corrosive wear rate increases and then decreases for polarization to higher anodic potentials. The corrosive wear rate W cw consists of three factors, namely pure mechanical wear loss W mech, weight loss W diss caused by the corrosion reaction, and an acceleratory-deceleratory contribution W acc due to the presence of passivating oxide film. The acceleratory and deceleratory contributions W acc arising from compositional change of the passivating oxide film indicate the microcutting and microploughing mechanisms respectively of abrasive wear. The increased W acc by application of 1.08 V SCE is discussed from the viewpoints of hydration and severe abrading wear action of the passivating oxide film on the Al-7%Si alloy specimen.
Published Version
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