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外加电势对304不锈钢在乙酸溶液中腐蚀磨损与重金属迁移行为的影响
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山东省重点研发计划项目(2017GSF220012);国家质监总局公益专项(201410083).


Effect of Applied Potentials on Tribocorrosion Behavior and Migration of Heavy Metal of 304 Stainless Steel in Acetic Acid
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    摘要:

    探究不同外加电位条件下304不锈钢在体积分数为3%的乙酸溶液中的腐蚀磨损行为及重金属元素的迁移规律;对摩擦过程中不锈钢在3%的乙酸溶液中的电位进行极化扫描,根据得出的极化曲线在阴极和阳极区选定5个电位,考察在不同电位下304不锈钢摩擦因数及腐蚀电流随滑动时间的变化规律,并计算相应的磨损体积;通过磨痕形貌的观察,推测腐蚀磨损机制,并探讨腐蚀磨损过程中304不锈钢中重金属元素的迁移规律。实验结果表明:在阴极区,不锈钢仅受到纯机械磨损作用,随着表面的钝化膜不断去除,摩擦因数逐渐降低,磨损率相对较低;而在阳极区,不锈钢受到磨损与腐蚀的共同作用,摩擦因数逐渐升高,磨损量和极化电流不断增大,在外加电势达到10 V时,不锈钢的磨损体积是OCP(-04 V)时的3倍,磨损机制转变为腐蚀磨损、磨粒磨损为主的混合作用机制;同时Cr和Ni 2种重金属元素的迁移量分别达到114、58 μg/L。

    Abstract:

    Tribocorrosion behavior and migration of heavy metal of AISI 304 stainless steel in volume fraction 3% of acetic acid under different potentials was studied.The five potentials from both cathodic and anodic domains were determined by the potentiodynamic anodic polarization curves recorded from stainless steel in testing solution.The friction coefficient and wear of stainless steel under each potential applied were determined,and corresponding wear of stainless steel was calculated.Tribocorrosion mechanism of stainless steel was discussed,and migration of heavy metal elements of AISI 304 stainless steel during triboccrrosion process was investigated.The results show that when the potential is at cathodic region,the mechanical wear is mainly observed for steel.Both friction coefficient and wear become less with the abrasion of surface oxide film.However,when the potential is increasing to anodic region,friction coefficient,total volume loss and current for stainless steel are increased with the help of synergist effort of corrosion and wear.Total wear loss is three times larger than that at OCP (-0.4 V) when the potential applied is 1.05 V.The wear is a mixed effect of tribocorrosion and abrasive wear,and the migration amount of Cr and Ni elements is 114 μg/L and 58 μg/L,respectively.

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刘健,孙航,于艳坤,高建国,万勇.外加电势对304不锈钢在乙酸溶液中腐蚀磨损与重金属迁移行为的影响[J].润滑与密封,2019,44(1):31-35.
. Effect of Applied Potentials on Tribocorrosion Behavior and Migration of Heavy Metal of 304 Stainless Steel in Acetic Acid[J]. Lubrication Engineering,2019,44(1):31-35.

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  • 在线发布日期: 2019-07-04
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