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Influence of oxidant KMnO_4 on film-forming process of rare earth metal conversion coating on LY12 aluminum alloy

机译:氧化剂KMnO_4对LY12铝合金稀土金属转化膜成膜过程的影响

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摘要

A Cu/Al galvanic couple was established to study the influence of the oxidant KMnO_4 on the film-forming process of rare earth metal (REM) conversion coating on LY12 aluminum alloy. It is found that the galvanic couple simulative experiment accords with the actual immersion, and it can be substantially used to simulate the behavior of LY12 aluminum alloy in the film-forming process. It is showed that the formation of the coating is quickened in CeCl_3 solution containing KMnO_4 compared with that not containing KMnO_4. XPS results reveal that the coating formed on cathode is composed of oxide or hydroxide of Ce and Mn, so the mechanism of formation of REM conversion coating changes when KMnO4 is added.
机译:建立了Cu / Al电偶,研究了氧化剂KMnO_4对LY12铝合金上稀土金属(REM)转化膜成膜过程的影响。结果表明,电偶模拟实验与实际浸没相吻合,可基本模拟LY12铝合金在成膜过程中的行为。结果表明,与不含KMnO_4的CeCl_3溶液相比,含KMnO_4的CeCl_3溶液可加快涂层的形成。 XPS结果表明,在阴极上形成的涂层是由铈和锰的氧化物或氢氧化物组成的,因此当添加KMnO4时,REM转化膜的形成机理发生了变化。

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