Hastelloy C276合金在模拟海水环境中的腐蚀磨损协同作用（英文）

Corrosion wear synergistic behavior of Hastelloy C276 alloy in artificial seawater

利用带有电化学测试体系的销一盘腐蚀磨损试验机系统研究Hastelloy C276合金在模拟海水中与Al2O3陶瓷对磨时的腐蚀和腐蚀磨损行为。结果表明，摩擦作用不仅使Hastelloy C276合金的开路电位大幅下降，而且将合金的腐蚀电流密度提高了3个数量级。Hastelloy C276合金的磨蚀与磨损之间存在明显的协同作用，磨损促进了腐蚀，反过来腐蚀也加速了磨损，在本实验摩擦条件下纯机械磨损在金属总磨损量中的占比均超过70％，这说明机械磨损作用是合金腐蚀磨损失效的主导因素。虽然摩擦使得Hastelloy C276合金的腐蚀速度得到极大提高，但是磨损对腐蚀的促进量在金属总磨损量中的占比并不大，而腐蚀对磨损的促进量在总磨损量中的占比较高，在14．6％～20．5％范围内变化。

A systematic investigation was carried out to discuss the corrosion and tribocorrosion behaviors of Hastelloy C276 alloy sliding against Al2O3 pin in artificial seawater, using a pin-on-disk tribometer integrated with a potentiostat for electrochemical control. The results show that the great decrease of open circuit potential and three orders of magnitude increase of corrosion current density occur caused by friction. There are clearly synergistic effect between corrosion and wear, resulting in corrosion-induced-wear and wear-induced-corrosion in tribocorrosion process. The contribution of pure mechanical wear to total material loss exceeds 70% in all sliding conditions, so mechanical wear is the dominant factor during tribocorrosion. For considering synergistic effect between corrosion and wear, the contribution of wear-induced-corrosion to total material loss is not very high although corrosion rate is greatly accelerated by friction. The fraction of corrosion-induced-wear to the total material loss is high and in the range of 14.6%-20.5% under all sliding conditions.