In this study, the use of electrical resistance (ER) sensors to monitor the corrosion of Al₉₄Cu₆ alloy is assessed and compared with 2024-T3 coupons. Under uniform corrosion, a good correlation was found between the ER sensors and mass loss on coupons. Three different chloride depositions are studied: (i) pre-contamination with dry/wet cycles, (ii) Volvo standard accelerated corrosion test and (iii) neutral salt spray test. The obtained results show good reproducibility of the ER sensors under all tested conditions. This suggests that ER sensors more levelled the effect of localised corrosion through a large surface evaluation compared with cross-sections. The corrosion thickness obtained with the ER sensors does not correspond to the mean depth obtained by cross-sections. This can be explained by the distribution and size of the localised corrosion events according to a finite element model proposed. The ER method allows obtaining useful real-time corrosion data for the understanding of the corrosion mechanisms and the development of accelerated tests. The chloride concentration, the frequency of salt application and wet/dry cycles have a strong influence on the corrosion rate of aluminium alloys.

中文翻译：

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氯化物污染大气条件下铝合金的实时腐蚀监测

在这项研究中，使用电阻 (ER) 传感器来监测 Al ₉₄ Cu ₆的腐蚀对合金进行评估并与 2024-T3 试样进行比较。在均匀腐蚀下，发现 ER 传感器与试样上的质量损失之间存在良好的相关性。研究了三种不同的氯化物沉积：(i) 干/湿循环的预污染，(ii) 沃尔沃标准加速腐蚀测试和 (iii) 中性盐雾测试。获得的结果表明 ER 传感器在所有测试条件下都具有良好的重现性。这表明与横截面相比，ER 传感器通过大表面评估更平衡了局部腐蚀的影响。ER 传感器获得的腐蚀厚度与横截面获得的平均深度不对应。这可以通过根据提出的有限元模型的局部腐蚀事件的分布和大小来解释。ER 方法允许获得有用的实时腐蚀数据，以了解腐蚀机制和加速试验的发展。氯化物浓度、施盐频率和干湿循环对铝合金的腐蚀速率有很大影响。