AF1410钢电子束焊接件在模拟海洋环境中的腐蚀行为

采用中性盐雾试验模拟海洋环境,研究了AF1410钢电子束焊接接头不同位置、不同暴露时间的腐蚀电化学阻抗谱特征,并结合电子束焊接接头组织结构分析评价了焊缝熔合区及母材的耐腐蚀性能及电化学行为.开路电位及阻抗谱研究表明,焊缝熔合区的粗大回火马氏体和析出碳化物易构成腐蚀电池,比基材腐蚀反应阻力小,易引起电化学腐蚀.建立了不同腐蚀阶段的阻抗谱等效电路,并对其进行了拟合.

Corrosion of AF1410 steel electron beam welding joints in simulated marine environment

The corrosion electrochemical impedance spectroscopy characteristics of AF1410 steel electron beam welding joints at different positions and for different exposure time were investigated in a simulated marine environment by neutral salt spray testing. The corrosion resistance and the electrochemical behaviors of the weld fusion zone and the base metal were evaluated according to the microstructure analysis of the welded joints. The investigation of open circuit potential and impedance spectroscopy indicates that thick tempered martensite and carbide precipitates at the weld fusion zone are easy to form a corrosion cell, and the corrosion reaction resistance is less than that of the base metal, which easily leads to electrochemical corrosion. Equivalent circuits of impedance spectroscopy were established and fitted for the different corrosion stages.