Degradation studies of epoxy coatings on printed circuit boards after pressure cooker test,Materials and Corrosion

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Degradation studies of epoxy coatings on printed circuit boards after pressure cooker test
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-08-03 , DOI: 10.1002/maco.202112606
Michael Schneider ₁ , Uta Gierth ₁ , Lenka Šimůnková ₁ , Paul Gierth ₁

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The present work focuses on the investigation of the degradation of screen-printed epoxy coatings on printed circuit boards under multiple corrosion loads realized by the pressure cooker test (PCT). Since methods like the common mechanical shear strength tests are destructive and limited in information, the authors' approach used electrochemical impedance spectroscopy to study the change of their electrochemical behavior and the state of degradation. Complementarily, the Fourier-transformed infrared spectroscopy was used to investigate the possible molecular change of the polymer due to the exposition. The experiments were carried out after different times of load. It could be shown that the complex conditions of the PCT initiate a controversial mechanism. The harsh corrosion load already results in a degradation of the polymer after 8 h but simultaneously the enhanced test temperature leads to ongoing curing processes consuming the remaining parts of resin and curing agents. As a result, the degradation kinetic seems to be delayed and after the test time of 96 h, the epoxy is less degraded than it was expected based on the results after a shorter time exposition.

中文翻译：

压力锅试验后印刷电路板上环氧涂层的降解研究

目前的工作重点是通过压力锅测试 (PCT) 研究在多种腐蚀载荷下印刷电路板上丝网印刷环氧树脂涂层的降解。由于像普通机械剪切强度测试这样的方法具有破坏性且信息有限，作者的方法使用电化学阻抗谱来研究其电化学行为的变化和降解状态。作为补充，傅里叶变换红外光谱用于研究聚合物可能因暴露而发生的分子变化。在不同的负载时间后进行实验。可以证明 PCT 的复杂条件引发了一个有争议的机制。剧烈的腐蚀负荷已经导致 8 小时后聚合物降解，但同时提高的测试温度导致持续的固化过程消耗树脂和固化剂的剩余部分。因此，降解动力学似乎有所延迟，并且在 96 小时的测试时间后，环氧树脂的降解程度低于基于较短时间暴露后结果的预期。

更新日期：2021-08-03

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