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首页> 外文期刊>Corrosion science >Current distribution during galvanic corrosion of carbon steel welded with type-309 stainless steel in NaCl solution
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Current distribution during galvanic corrosion of carbon steel welded with type-309 stainless steel in NaCl solution

机译：在氯化钠溶液中焊接309型不锈钢的碳钢电腐蚀过程中的电流分布。

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摘要

Galvanic corrosion of carbon steel welded with type-309 stainless steel in NaCl solution was tentatively evaluated with a newly developed multi-channel electrode technique in which the welded specimen was divided into nine working electrodes (WEs), reconstructed in resin, and connected individually to an imaginary ground level of an electric circuit via relay switches. This allows the WEs to join a galvanic couple and simultaneous measurement of participating current or open circuit potential of each WE. WEs were immersed together in 5.1 × 10~2moldm~(-3) or 2.1 × 10~(-4)moldm~(-3) NaCl solutions, and spatial distribution of participating currents and open circuit potentials were monitored as a function of immersion time. The WE of the weldment acted as a cathode throughout the immersion period, while the other WEs of base steel became anodes or cathodes depending on their location, immersion time and concentration of the electrolyte solution. The ability of zinc-rich paint to protect the welded specimen as sacrificial anode was also investigated.
机译：用新开发的多通道电极技术，初步评估了用309型不锈钢焊接的碳钢在NaCl溶液中的电化腐蚀，该技术将焊接的样品分为9个工作电极（WEs），用树脂重建，并分别与经由继电器开关的电路的虚假接地电平。这使得WE可以加入电偶，并同时测量每个WE的参与电流或开路电势。将WEs一起浸入5.1×10〜2moldm〜（-3）或2.1×10〜（-4）moldm〜（-3）NaCl溶液中，并根据浸没函数监测参与电流和开路电势的空间分布时间。在整个浸入期间，焊件的WE充当阴极，而其他基础钢WE则根据其位置，浸入时间和电解质溶液的浓度成为阳极或阴极。还研究了富锌涂料保护焊接试样作为牺牲阳极的能力。

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