Mn元素对等离子体电解氧化陶瓷层相组成的影响

Influence of Manganese Element on Phase Composition of Plasma Electrolytic Oxidation Ceramic Coatings

在Na2SiO3-NaOH体系的电解液中,对Mn元素含量不同的1070纯铝及3003铝合金进行等离子体电解氧化。对所得陶瓷层的厚度及显微硬度进行了测试,并分析了陶瓷层的微观形貌及相组成。结果表明:1070纯铝表面所形成的陶瓷层由α-Al2O3及γ-Al2O3组成,而3003铝合金表面所形成的陶瓷层则由γ-Al2O3组成;处理时间相同时,3003铝合金所形成的陶瓷层较纯铝1070所形成的陶瓷层更厚,但显微硬度更低,致密性下降,Mn元素对反应过程中高温氧化铝相的形成有一定的抑制作用。

Applying plasma electrolytic oxidation in condition of Na2SiO3-NaOH solutions on pure aluminum 1070 and aluminum alloy 3003. The thickness and microhardness of ceramic coatings were tested, and mierostructure and phase composi-tion of ceramic layer were analyzed. Results showed that, ceramic coatings of pure aluminum 1070 was consisted of phase α-Al2O3 and phase γ-Al2O3 , while aluminum alloy 3003 contained phase γ-Al2O3 only; At the same processing time, the ceramic coatings of aluminum alloy 3003 were thicker but lower in micro-hardness and compactness than those of pure aluminum 1070. Manganese element inhibited the formation of high temperature alumina phase on the reaction process.