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首页> 外文期刊>RSC Advances >Pit evolution around the fusion line of a NiCrMoV steel welded joint caused by galvanic and stress-assisted coupling corrosion
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Pit evolution around the fusion line of a NiCrMoV steel welded joint caused by galvanic and stress-assisted coupling corrosion

机译：电镀和应力辅助耦合腐蚀引起的Nicrmov钢焊接接头融合系周围的坑进化

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摘要

The corrosion of NiCrMoV steel welded joints is performed in an aqueous solution of 3.5 wt% NaCl at 180 degrees C in a container at a pressure of 0.8 MPa. The specimens in the shape of cylindrical tensile rods are immersed in the aqueous solution under the action of tensile stress in a range of 0 to 0.9 of the yield stress of the base metal. The experimental results suggest that there is macro-galvanic corrosion in the welded joint with the coarse-grained heat affected zone (CGHAZ) as anode due to the highest corrosion susceptibility of the CGHAZ. The CGHAZ has the highest positive current density in the welded joints as measured by the scanning vibrating electrode technique. The two-parameter Weibull distribution function, which is represented by the Weibull modulus and characteristic strength, is used to analyze the distribution of the depth of pits at different immersion times. Both the Weibull modulus and characteristic strength are calculated, and found to be dependent on the applied tensile stress. The values of the characteristic pit depth and the average pit depth reveal that there are two mechanisms controlling the corrosion of the NiCrMoV steel welded joints; one is galvanic corrosion, and the other is stress-assisted corrosion.
机译：的NiCrMoV钢的耐焊接接头在3.5重量％的NaCl在180℃在容器中在0.8MPa的压力下的水溶液中进行。在圆筒状的拉伸杆的形状的试样浸渍在拉伸应力的作用下在一个范围为0到基底金属的屈服应力的0.9的水溶液。实验结果表明，有与作为阳极的粗粒热影响区（粗晶区）的焊接接头的宏观电偶腐蚀由于粗晶区的最高腐蚀敏感性。粗晶区具有在焊接接头的最高正电流密度，通过将扫描振动电极技术测量。两个参数Weibull分布函数，它是由威布尔模量和特性强度所表示，用于分析凹坑的深度在不同浸渍时间的分布。既威布尔模量和特性强度进行计算，并发现是依赖于所施加的拉伸应力。特征坑深度和平均凹坑深度的值表明，有两种机制控制腐蚀的NiCrMoV钢焊接接头;一个是电化腐蚀，并且另一个是应力辅助腐蚀。

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  • 来源
    《RSC Advances》 |2018年第7期|共11页
  • 作者

    Weng Shuo; Huang Yuhui; Xuan Fuzhen; Yang Fuqian;

  • 作者单位

    East China Univ Sci &

    Technol Sch Mech &

    Power Engn Lab Pressure Syst &

    Safety MOE Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol Sch Mech &

    Power Engn Lab Pressure Syst &

    Safety MOE Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol Sch Mech &

    Power Engn Lab Pressure Syst &

    Safety MOE Shanghai 200237 Peoples R China;

    Univ Kentucky Dept Chem &

    Mat Engn Mat Program Lexington KY 40513 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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