The electrochemical interactions between aluminum alloy 7075 and low-carbon steels under gelled electrolytes were studied. Such electrolytes provided the opportunity to investigate both thick and thin electrolyte systems. The electrolyte was chemically modified to visually track the acidic fronts during the anodic reaction and the subsequent hydrolysis process. Two mathematical models were validated for both thick and ultrathin electrolytes. The acidification of thick electrolytes was extended some millimeters beyond the aluminum alloy surface, whereas the acidic front was localized next to the metallic joint using ultrathin electrolytes. The combination of both numerical and experimental results allows proving (and explaining why) that the acidification process is more aggressive under dilute than under concentrated electrolytes.

中文翻译：

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AA7075 电偶腐蚀期间电解液的酸化：数值和实验研究

研究了7075铝合金与低碳钢在凝胶电解质下的电化学相互作用。这种电解质提供了研究厚和薄电解质系统的机会。在阳极反应和随后的水解过程中，电解液经过化学改性以在视觉上跟踪酸性前沿。两种数学模型均针对厚电解质和超薄电解质进行了验证。厚电解质的酸化延伸到铝合金表面几毫米之外，而使用超薄电解质将酸性前沿定位在金属接头附近。数值和实验结果的结合可以证明（并解释原因）在稀电解质下比在浓电解质下酸化过程更具侵略性。