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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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、58μg/L。
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.
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.
引文
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[3]GUARNERI F,COSTA C,CANNAVS P,et al.Release of nickel and chromium in common foods during cooking in 18/10(Grade 316)stainless steel pots[J].Contact Dermatitis,2017,76(1):40-48.
[4]KAMERUD K L,HOBBIE K A,ANDERSON K A.Stainless steel leaches nickel and chromium into foods during cooking[J].Journal of Agricultural and Food Chemistry,2013,61(39):9495-9501.
[5]DALIPI R,BORGESE L,CASAROLI A,et al.Study of metal release from stainless steels in simulated food contact by means of total reflection X-ray fluorescence[J].Journal of Food Engineering,2016,173:85-91.
[6]黄蓉芳,李谋成.201型不锈钢在酸性食物模拟环境中的腐蚀行为[J].腐蚀与防护,2016,37(1):12-15.HUANG R F,LI M C.Corrosion behavior of type 201 stainless steel in simulated acidic food environment[J].Corrosion&Protection,2016,37(1):12-15.
[7]匡步肖,马国军,毛振威.不锈钢食具材料中重金属元素的迁移行为[J].武汉科技大学学报,2015,38(5):336-340.KUANG B X,MA G J,MAO Z W.Migration behavior of heavy metals from stainless steel utensils[J].Journal of Wuhan University of Science and Technology,2015,38(5):336-340
[8]MAZINANIAN N,HERTING G,WALLINDER I O,et al.Metal release and corrosion resistance of different stainless steel grades in simulated food contact[J].Corrosion,2016,72(6):775-790.
[9]MAZINANIAN N,HEDBERG Y S.Metal release mechanisms for passive stainless steel in citric acid at weakly acidic p H[J].Journal of The Electrochemical Society,2016,163(10):C686-C693.
[10]STEMP M,MISCHLER S,LANDOLT D.The effect of contact configuration on the tribocorrosion of stainless steel in reciprocating sliding under potentiostatic control[J].Corrosion Science,2003,45(3):625-640.
[11]崔文,张鑫,王庆良.316L不锈钢关节材料的摩擦腐蚀行为[J].润滑与密封,2016,41(8):34-38.CUI W,ZHANG X,WANG Q L.Tribocorrosion behavior of316L stainless steel for artificial joint materials[J].Lubrication Engineering,2016,41(8):34-38.
[12]ZHANG Y,WANG J Z,YIN X Y,et al.Tribocorrosion behaviour of 304 stainless steel in different corrosive solutions[J].Materials and Corrosion,2016,67(7):769-777.
[13]OBADELE B A,ANDREWS A,SHONGWE M B,et al.Tribocorrosion behaviours of AISI 310 and AISI 316 Austenitic stainless steels in 3.5%NaCl solution[J].Materials Chemistry and Physics,2016,171:239-246.
[14]BEN SAADA F,ELLEUCH K,PONTHIAUX P.On the tribocorrosion responses of two stainless steels[J].Tribology Transactions,2017,61(1):1-8.