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首页> 外文期刊>International Journal of Electrochemical Science >Effects of Flow Variations on the Galvanic Corrosion of the Copper/AISI 304 Stainless Steel Pair in Lithium Bromide Using a Zero-Resistance Ammeter
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Effects of Flow Variations on the Galvanic Corrosion of the Copper/AISI 304 Stainless Steel Pair in Lithium Bromide Using a Zero-Resistance Ammeter

机译：零电阻电流表中流量变化对铜/ AISI 304不锈钢对在溴化锂中电偶腐蚀的影响

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摘要

The effects of flow variations on the galvanic corrosion of the copper/AISI 304 stainless steel pair in aconcentrated lithium bromide solution were investigated in a hydraulic circuit applying different flowsteps and using a zero-resistance ammeter (ZRA). The flow steps consist in applying a flow rate forsixty minutes after leaving the system under stagnant conditions for another sixty minutes; thisprocedure is repeated during eight hours. The magnitude of the steps is different depending on the flowregime studied, ranging from a Reynolds number of 633 to 5066. Results show that, when a flow stepis applied, the galvanic current density increases and the galvanic potential shifts towards morenegative values. However, with time, this increase in the galvanic current density is lower, reaching itslowest value in the last hour of the experiment at a Reynolds number of 5066. Thus, although thecorrosion rate increases as Reynolds number increases, the protective corrosion products are generatedearlier on the copper surface.
机译：在液压回路中采用不同的流量步骤并使用零电阻电流表（ZRA），研究了流量变化对铜/ AISI 304不锈钢对在浓溴化锂溶液中电偶腐蚀的影响。流动步骤包括在将系统置于停滞状态下另外六十分钟后施加六十分钟的流速。在八个小时内重复此过程。步幅的大小因所研究的流态而异，范围为633至5066的雷诺数。结果表明，应用流阶时，电电流密度增加，电势向负值移动。但是，随着时间的流逝，电流电流密度的增加变小，在实验的最后一个小时达到雷诺数为5066的最低值。因此，尽管腐蚀率随雷诺数的增加而增加，但保护性腐蚀产物却在早期产生。铜表面。

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