Through the development of an eight-channel multi-electrode array sensor system and the immersion test,the corrosion process of carbon steel weld and the inhibition performance of nitrite on weld were studied in simulation pore solution.The galvanic corrosion among weld metal,heat affected zone and base metal and the inhibition performance of nitrite were studied by measuring the individual open circuit potential,coupled potential and galvanic current.The measurement results of multi-electrode array sensor system and immersion test showed the weld metal and the nearby area of weld metal would corrode preferentially.The inhibitor NaNO2 performed well inhibition effect for the welding corrosion by reducing the galvanic current apparently.%通过8通道耦合阵列多电极系统以及腐蚀试片的浸泡实验研究了碳钢焊缝在模拟混凝土孔隙液中的腐蚀行为以及亚硝酸盐缓蚀剂的作用效果.通过测量开路电位、耦合电位以及电偶电流观测焊缝区域(Weld metal)、热影响区域(Heat affectedzone)与母材区域(Base metal)之间的电偶腐蚀以及亚硝酸盐缓蚀剂对焊缝部位的作用效果.耦合阵列多电极系统以及腐蚀试片的浸泡实验结果共同表明,在含有Cl-的模拟混凝土孔隙液中,Q235的WM及其附近区域会发生优先腐蚀.同时,亚硝酸盐缓蚀剂能够明显减小不同区域之间的电偶电流,从而减小焊缝处的局部腐蚀风险.
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