Abstract The presents objective is to investigate the combined effect of alloyed Pb and Ga on surface segregation by heat treatment and ensuing anodic activation of aluminium in chloride solution. Model alloys containing Pb and Ga, which were heat treated in the range 300–600 °C, were characterized electrochemically in 5% NaCl solution. Annealing at 600 °C resulted in significant segregation of Pb causing limited activation, while Ga remained in solid solution. The presence 50 ppm Ga had only a small contribution to activation, while 1000 ppm Ga contributed significantly by becoming enriched at areas around Pb segregations and spreading radially by dealloying.

中文翻译：

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小浓度镓和铅对氯化物溶液中铝阳极活化的影响

摘要 目前的目的是研究合金化 Pb 和 Ga 通过热处理和随后的铝在氯化物溶液中的阳极活化对表面偏析的综合影响。含有 Pb 和 Ga 的模型合金在 300-600 °C 范围内热处理，在 5% NaCl 溶液中进行电化学表征。在 600 °C 下退火导致 Pb 的显着偏析导致有限的活化，而 Ga 保留在固溶体中。50 ppm Ga 的存在对活化的贡献很小，而 1000 ppm Ga 通过在 Pb 偏析周围区域富集并通过脱合金径向扩散而贡献显着。