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Influence of microstructure and roughness level on corrosion resistance of the austenitic stainless steel welded joint
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-02-03 , DOI: 10.1002/maco.202012241 Jovanka Kovačina 1 , Bore Jegdić 1 , Bojana Radojković 1 , Dunja Marunkić 1 , Sanja Stevanović 1 , Anđela Simović 2
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-02-03 , DOI: 10.1002/maco.202012241 Jovanka Kovačina 1 , Bore Jegdić 1 , Bojana Radojković 1 , Dunja Marunkić 1 , Sanja Stevanović 1 , Anđela Simović 2
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The influence of microstructure and surface roughness of the X5CrNi18-10 austenitic stainless steel-welded joint on resistance to uniform, pitting, and intergranular corrosion, as well as on the stability of the passive film, was evaluated. The microstructure was revealed by optical microscopy and scanning electron microscopy, whereas surface topography and roughness levels were determined by atomic force microscopy. Corrosion characteristics were obtained by the electrochemical potentiokinetic reactivation method with double loop, electrochemical impedance spectroscopy method, as well as by potentiodynamic measurements. The degree of sensitization of heat-affected zone (HAZ) was significantly lower than the threshold value required for the occurrence of intergranular corrosion. However, HAZ showed a significantly greater tendency to pitting and uniform corrosion compared to weld metal and base metal. No effect of roughness levels (RMS from 3.6 to 54 nm) on the pitting potential value of the welded joint was observed (unlike in HAZ). The polished surface shows significantly higher corrosion resistance than the grinded surface. Generally, polishing improved corrosion resistance, especially in HAZ, which is very important because HAZ is a critical place for the occurrence of pitting and other types of corrosion.
中文翻译：
显微组织和粗糙度等级对奥氏体不锈钢焊接接头耐蚀性的影响
评估了 X5CrNi18-10 奥氏体不锈钢焊接接头的显微组织和表面粗糙度对均匀腐蚀、点蚀和晶间腐蚀以及钝化膜稳定性的影响。通过光学显微镜和扫描电子显微镜揭示微观结构，而通过原子力显微镜确定表面形貌和粗糙度水平。通过双回路电化学动电位再活化法、电化学阻抗谱法以及动电位测量获得腐蚀特性。热影响区（HAZ）的敏化程度明显低于发生晶间腐蚀所需的阈值。然而，与焊接金属和母材相比，HAZ 显示出明显更大的点蚀和均匀腐蚀倾向。没有观察到粗糙度水平（RMS 从 3.6 到 54 nm）对焊接接头点蚀电位值的影响（与热影响区不同）。抛光表面显示出明显高于研磨表面的耐腐蚀性。一般来说，抛光提高了耐腐蚀性，特别是在热影响区，这是非常重要的，因为热影响区是发生点蚀和其他类型腐蚀的关键场所。
更新日期：2021-02-03
中文翻译：
显微组织和粗糙度等级对奥氏体不锈钢焊接接头耐蚀性的影响
评估了 X5CrNi18-10 奥氏体不锈钢焊接接头的显微组织和表面粗糙度对均匀腐蚀、点蚀和晶间腐蚀以及钝化膜稳定性的影响。通过光学显微镜和扫描电子显微镜揭示微观结构，而通过原子力显微镜确定表面形貌和粗糙度水平。通过双回路电化学动电位再活化法、电化学阻抗谱法以及动电位测量获得腐蚀特性。热影响区（HAZ）的敏化程度明显低于发生晶间腐蚀所需的阈值。然而，与焊接金属和母材相比，HAZ 显示出明显更大的点蚀和均匀腐蚀倾向。没有观察到粗糙度水平（RMS 从 3.6 到 54 nm）对焊接接头点蚀电位值的影响（与热影响区不同）。抛光表面显示出明显高于研磨表面的耐腐蚀性。一般来说，抛光提高了耐腐蚀性，特别是在热影响区，这是非常重要的，因为热影响区是发生点蚀和其他类型腐蚀的关键场所。
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