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殘余應力對金屬材料局部腐蝕行為的影響

Effect of residual stress on localized corrosion behavior of metallic materials

  • 摘要: 基于殘余應力測試新方法與先進電化學測試技術的進展, 圍繞殘余應力類型和大小對金屬材料點蝕以及應力腐蝕行為的作用機理進行了總結和歸納. 研究發現, 盡管殘余壓應力對腐蝕行為的抑制作用得到了大量實驗的證實, 但是在不同條件下其作用方式以及機理不盡相同, 并且與材料的結構特點以及腐蝕產物等密切相關. 同時, 殘余拉應力的作用尚不明確, 受到材料類型和其他因素耦合的嚴重影響. 另外, 在某些環境下, 影響腐蝕行為的關鍵是殘余應力梯度或殘余應力的某個臨界值. 但是對有色金屬的研究表明殘余拉應力和壓應力均會導致基體中位錯和微應變等結構缺陷增加, 進而促進點蝕敏感性, 降低材料服役性能. 最后, 對目前研究存在的局限進行了討論和展望.

     

    Abstract: It has been generally recognized that the synergistic action of aggressive media and residual stress that arises during metals fabrication, processing, and service can affect the behavior of corrosion electrochemistry. However, due to the limitation of testing techniques, studies on the influence of residual stress and its synergistic effects with other factors on corrosion initiation and propagation are relatively rare and confined to macro levels. With the developments of residual stress measurements and local electrochemical methods, especially the application of localized electrochemical probe techniques, the effect of residual stress on corrosion electrochemical behavior in the micro-domain has been studied by many researchers in recent years. Based on new testing methods of residual stress and advanced electrochemical measurements, this paper mainly summarized the contents and progress of recent research on metallic materials pitting and stress corrosion behavior under different types and levels of residual stresses. For iron and steel materials, the inhibition of compressive residual stress on corrosion has been supported by many experiments, but it shows different roles and mechanisms in different conditions, closely correlating with material structure and corrosion product. In addition, research has demonstrated that tensile residual stress has different impacts on corrosion resistance in alkaline and acidic conditions and that the influence of tensile residual stress on corrosion, strongly influenced by material types and other coupling factors, is still uncertain. Moreover, some experimental results have also shown that residual stress gradient or its critical value is a significant contributor to corrosion behavior, and only when they are greater than a certain value can pitting or micro-cracks be significantly initiated. However, studies on nonferrous metals suggest that both tensile and compressive residual stresses reduce corrosion resistance because they can increase dislocation density and microstrain, and these structural defects increase the occurrence of active sites for pitting corrosion, thereby degrading performance. Finally, the limitations and prospect of current research were also presented in this paper.

     

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