To promote recycling of carbon fiber reinforced plastics (CFRPs), we investigated the removal mechanism of resin by electrical treatment at high voltage. Using the observations, we found that resin removal was triggered by electrical treatment. Based on the observations and current dependency, the resin was removed by a mechanical approach that employed the oxygen gas generated from water electrolysis, i.e., the gas peeled the resin. Moreover, the cathodic treatment was unable to achieve the resin removal because of the high diffusion of hydrogen gas into the epoxy resin. During anodic treatment, CO, CO, and oxygen gases were generated from the specimen, and damage to the carbon fiber (CF) was observed on the specimen after treatment for 180 min. The mechanism of the resin removal was governed by the resin peeling off from the CFRP composite, which was triggered by the oxygen gas generated from the water electrolysis. During electrical conduction, the peeling was initiated at the voids that were formed by the oxidation of the locally heated resin spots. At low resin content levels, the CF was subjected to damage due to the electrical conduction, which was accompanied by the application of a high voltage.

中文翻译：

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水电解气体产生引发CFRP复合材料中环氧树脂的去除机理


为了促进碳纤维增强塑料（CFRP）的回收利用，我们研究了高压电处理去除树脂的机理。通过观察，我们发现树脂去除是由电处理触发的。根据观察结果和电流依赖性，通过机械方法去除树脂，该方法利用水电解产生的氧气，即气体剥离树脂。此外，由于氢气大量扩散到环氧树脂中，阴极处理无法实现树脂去除。在阳极处理过程中，试样产生CO、CO和氧气，处理180分钟后在试样上观察到碳纤维（CF）的损坏。树脂去除的机理是由水电解产生的氧气触发树脂从 CFRP 复合材料上剥离来控制的。在导电过程中，剥离是在局部加热的树脂点氧化形成的空隙处开始的。在低树脂含量水平下，CF由于导电而受到损坏，同时伴随着高电压的施加。