ABSTRACT

A wire beam electrode (WBE) method for investigating the crevice corrosion has been demonstrated by mapping non-uniform corrosion processes occurring on copper and copper alloys including the pure copper UNS No. C11000 (Cu), brass UNS No. C28000 (Cu–Zn alloy) and tin bronze UNS No. C51900 (Cu–Sn alloy) in mass 0.6% NaCl solution with the crevice spacings of d=103 μm and 206 μm. It was found that the sequence of three copper alloys in susceptibility for the crevice corrosion was that Cu–Zn alloy > Cu–Sn alloy > pure Cu. The average galvanic current of the Cu–Sn alloy in the covered region was changed from cathode to anode when the crevice spacing was increased to 206 μm. To sum up, it is feasible to study the behaviours of crevice corrosion within the different crevice spacings with the WBE method.

摘要

通过绘制铜和铜合金包括纯铜 UNS No. C11000 (Cu)、黄铜 UNS No. C28000 (Cu-Zn合金）和锡青铜 UNS No. C51900（Cu-Sn 合金）在质量为 0.6% 的 NaCl 溶液中，缝隙间距d =103 μm 和 206 μm。发现对缝隙腐蚀敏感的三种铜合金的顺序是Cu-Zn合金> Cu-Sn合金>纯Cu。当缝隙间距增加到 206 μm 时，覆盖区域中 Cu-Sn 合金的平均电流从阴极变为阳极。综上所述，用WBE方法研究不同缝隙间距内的缝隙腐蚀行为是可行的。