Electrolytic pickling of the oxide layer on hot-rolled 304 stainless steel in sodium sulphate
Electrolytic pickling of the oxide layer on hot-rolled 304 stainless steel in sodium sulphate
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DOI：
10.1016/j.corsci.2008.07.004
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发表时间：
2008-10
影响因子：
8.3
通讯作者：
Lian-Fu Li;P. Caenen;M. Jiang
中科院分区：
文献类型：
--
作者：
Lian-Fu Li;P. Caenen;M. Jiang
采用电化学、失重和SEM-EDX等方法研究了热轧304不锈钢在Na 2SO 4电解液中的电解酸洗过程。酸洗发生在积极和transassive极化。阐明了在活化极化和过钝化极化过程中酸洗的机理和动力学。氧化物层中的金属相在主动极化期间溶解，而氧化物层被显著底切。在过钝化极化过程中，氧化层中的氧化铬被氧化成可溶性阴离子，而氧化铁和金属相可以被保留或去除。酸洗由于底切与积极的极化是非常明显的。
Electrolytic pickling of hot-rolled 304 stainless steel in Na2SO4electrolyte was investigated with electrochemical, weight loss and SEM–EDX measurements. Pickling took place upon both active and transpassive polarisations. Mechanism and kinetics of pickling during active and transpassive polarisations were unravelled. Metallic phase in oxide layer was dissolved during active polarisation while the oxide layer was significantly undercut. Chromium oxide in the oxide layer was oxidised to soluble anions during transpassive polarisation, while iron oxide and metallic phase could either be remained or removed. Pickling due to undercutting with active polarisation was highly pronounced.