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Home > Industry news > 电泳漆的电沉积淀

电泳漆的电沉积淀

Release Date:2023-10-10 Content Comes From:http://jlwjdd.com/en/

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电泳漆的电沉积淀


电沉积:在电泳涂装时,带电荷的粒子(树脂和颜填、料)在电场作用下到达相反电荷的电极,被H(阳极电泳)OH(阴极电泳)所中和,变成不溶于水的涂膜,这层漆膜很稳定,而且致密均一。这一过程称为电沉积。汽车配件电镀


如在阳极电泳中,当带负电荷的水溶性树脂粒子在直流电场作用下到达阳极(被涂工件)时,即发生电沉积反应,首先是OH放电:


2OHˉ → ↑O2 + 2H+ 4e


OH+H=H2O 此反应的结果使阳极区周围H积聚,即局部PH值降低,这时过量H即于RCOO树脂阴离子反应,使树脂析出并沉积在阳极(被涂工件)表面:


RCOO+H → ↓ROOOH 。

汽车配件电镀

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