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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Plastic Deformation on the Corrosion Behavior of a Super-Duplex Stainless Steel
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Effect of Plastic Deformation on the Corrosion Behavior of a Super-Duplex Stainless Steel

机译：塑性变形对超双相不锈钢腐蚀行为的影响

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摘要

The role of plastic deformation on the corrosion behavior of a 25Cr-7Ni super-duplex stainless steel (SDSS) in a 3.5 wt.% sodium chloride solution at 90℃ was investigated. Different levels of plastic strain between 4 and 16% were applied to solution annealed tensile specimens and the effect on the pitting potential measured using potentiodynamic electrochemical techniques. A nonlinear relationship between the pitting potential and the plastic strain was recorded, with 8 and 16% causing a significant reduction in average E_p, but 4 and 12% causing no significant change when compared with the solution-annealed specimens. The corrosion morphology revealed galvanic interaction between the anodic ferrite and the cathodic austenite causing preferential dissolution of the ferrite. Mixed potential theory and the changing surface areas of the two phases caused by the plastic deformation structures explain the reductions in pitting potential at certain critical plastic strain levels. End-users and manufacturers should evaluate the corrosion behavior of specific cold-worked duplex and SDSSs using their as-produced surface finishes assessing in-service corrosion performance.
机译：研究了塑性变形对25Cr-7Ni超双相不锈钢（SDSS）在3.5 wt。％的氯化钠溶液中于90℃下的腐蚀行为的影响。对溶液退火的拉伸试样施加4％至16％的不同水平的塑性应变，并使用电位动力学电化学技术测量对点蚀电位的影响。记录了点蚀电位与塑性应变之间的非线性关系，与固溶退火试样相比，有8％和16％导致平均E_p显着降低，但有4％和12％导致无平均变化。腐蚀形态揭示了阳极铁素体和阴极奥氏体之间的电相互作用，导致铁素体优先溶解。混合势理论和由塑性变形结构引起的两相表面积的变化解释了在某些临界塑性应变水平下点蚀电位的降低。最终用户和制造商应使用其生产的表面光洁度评估使用中的腐蚀性能，以评估特定的冷作双相不锈钢和SDSS的腐蚀行为。

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