X-Ray tomographic characterisation of pitting corrosion in lean duplex stainless steel
X-Ray tomographic characterisation of pitting corrosion in lean duplex stainless steel
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DOI：
10.1016/j.corsci.2019.108406
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发表时间：
2020-04-01
影响因子：
8.3
通讯作者：
Engelberg, Dirk L.
中科院分区：
文献类型：
--
作者：
Eguchi, Kenichiro;Burnett, Timothy L.;Engelberg, Dirk L.
用x射线计算机断层扫描观察了2202级贫双相不锈钢点蚀的形核和扩展。使用电化学原位电池测量的电荷与坑生长特性和相关的坑形状形态相关。在铁氧体选择性溶解形成的孔洞中观察到花边金属盖。所有凹坑均呈半椭球形，热处理后的显微组织中仍有大量未溶解的奥氏体晶粒残留。对于接收到的微观结构，稳定性产物的典型值在0.3 Am-1以下，热处理样品的稳定性值更大。
The nucleation and growth of pitting corrosion in grade 2202 lean duplex stainless steel has been observed via X-ray Computed Tomography. The charge measured using an electro-chemical in-situ cell was correlated with pit growth characteristics and associated pit shape morphologies. Lacy metal covers were observed with holes formed by selective dissolution of the ferrite. All pits grew into semi-ellipsoid shapes, with large fractions of un-dissolved austenite grains remaining inside pits in heat-treated microstructures. For the as-received micro- structure the stability product showed typical values below 0.3 Am-1 with larger stability values observed for the heat-treated sample.