Evaluating organic coating performance by EIS: Correlation between long-term EIS measurements and corrosion of the metal substrate
Evaluating organic coating performance by EIS: Correlation between long-term EIS measurements and corrosion of the metal substrate
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DOI：
10.1002/maco.202313863
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发表时间：
2023-09-20
影响因子：
1.8
通讯作者：
Curioni, Michele
中科院分区：
文献类型：
--
作者：
Bongiorno, Vincenzo;Michailidou, Emmanouela;Curioni, Michele
在这项研究中，检查了从完整有机涂层浸泡过程中获得的电化学阻抗谱的时间序列中获得腐蚀指示剂的可能性。为了产生广泛的性能分布，在 AA2024-T3 和冷轧低碳钢上涂覆了具有不同颜料体积浓度的涂料，并在四种不同的电解液中和不同的暴露时间下进行了测试。防腐性能的相对排名是基于剥离涂层后金属基材的视觉外观，它与电化学阻抗谱的时间序列估计的腐蚀电荷的估计密切相关。涂漆金属的腐蚀测试是在一系列引起不同程度降解的条件下进行的。定期测量电化学阻抗谱，并且对于每种条件，使用一系列阻抗数据来计算与金属基材上的腐蚀相关的数字腐蚀指标。
In this study, the possibility of obtaining a corrosion indicator from a time series of electrochemical impedance spectra acquired during immersion of intact organic coatings was inspected. To generate a wide distribution in performance, coatings with different pigment volume concentrations were applied on AA2024-T3 and cold-rolled mild steel and tested in four different electrolytes and for different exposure times. The relative ranking of anticorrosion performance was based on the visual appearance of the metal substrates after stripping the coating and it correlated well with the estimation of the corrosion charge estimated from the time series of electrochemical impedance spectroscopy spectra.Corrosion testing of painted metals was performed in a range of conditions inducing different levels of degradation. Electrochemical impedance spectroscopy was measured periodically and, for each condition, the series of impedance data was used to calculate a numeric corrosion indicator that correlates with the corrosion on the metal substrate.image