On the Depassivation Mechanism of Lean Duplex Stainless Steels and the Influence of the Partitioning of the Alloying Elements
On the Depassivation Mechanism of Lean Duplex Stainless Steels and the Influence of the Partitioning of the Alloying Elements
复制标题
精益双相不锈钢的去钝化机理及合金元素分配的影响
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
K. Wolski
中科院分区：
文献类型：
--
作者：
F. Ruel;D. Tite;A. Gaugain;S. Saedlou;K. Wolski
采用动电位极化法研究了UNS S32304、S32202和S32101贫双相不锈钢（DSS）在26wt%氯化钠（NaCl）中的脱钝化过程，以了解局部腐蚀现象中的选择性溶解过程。结果表明，三个等级的钝化分两个阶段进行。首先，奥氏体是在不超过0.3 pH单位的范围内脱钝化的唯一相，在DSS的极化曲线上提供单一腐蚀峰。随后，铁素体也被去钝化，并在更阴极的电位下提供第二腐蚀峰。结果进行了讨论的合金元素的分区。
The depassivation of UNS S32304, S32202, and S32101 lean duplex stainless steels (DSS) in 26 wt% sodium chloride (NaCl) was investigated by potentiodynamic polarization to understand the selective dissolution processes in localized corrosion phenomena. Results showed that the depassivation of the three grades proceeds in two stages. First, the austenite is the only phase depassivated within the range of no more than 0.3 pH units, providing a single corrosion peak on the polarization curves of the DSS. Subsequently, the ferrite is also depassivated and provides a second corrosion peak at a more cathodic potential. Results are discussed in terms of the partitioning of alloying elements.