Abstract

Microstructure of ceramic coatings formed on commercially pure aluminum by plasma electrolytic oxidation using different amounts of sodium silicate was studied. Analysis of chemical composition and microhardness measurements of the coatings were carried out to characterize the morphology of the coatings. The addition of sodium silicate (1–3 g/L) increased the thickness about 8 orders of magnitude and promotes the growth of the coatings. Chemical analysis of the coatings showed that with increasing sodium silicate concentration in the electrolyte from 1 to 3 g/L, the amount of manganese in the coatings was reduced ∼12%. The contribution of aluminum and silicon changed with a reciprocal relationship. When the concentration of Na₂SiO₃ changed from 1 to 2 g/L, the aluminium content was reduced about 26% and silicon increased about 80%. When the concentration of Na₂SiO₃ changed from 2 to 3 g/L, the aluminium content increased about 38% and the concentration of silicon reduced about 60%. The microhardness of the coatings was increased about 2 orders of magnitude by increasing the concentration of sodium silicate from 1 to 3 g/L.

中文翻译：

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硅酸钠浓度对等离子电解氧化工业纯铝制陶瓷涂层形貌的影响

摘要

研究了使用不同量的硅酸钠通过等离子电解氧化在商用纯铝上形成的陶瓷涂层的微观结构。进行涂层的化学组成和显微硬度测量分析以表征涂层的形态。添加硅酸钠（1-3 g / L）可使厚度增加约8个数量级，并促进涂层的生长。涂层的化学分析表明，随着电解质中硅酸钠浓度从1 g / L增加到3 g / L，涂层中的锰含量减少了约12％。铝和硅的贡献随着相互关系而变化。当Na ₂ SiO ₃的浓度从1 g / L更改为2 g / L，铝含量减少了约26％，硅含量增加了约80％。当Na ₂ SiO ₃的浓度从2变为3 g / L时，铝含量增加了约38％，硅浓度减少了约60％。通过将硅酸钠的浓度从1 g / L增加到3 g / L，涂层的显微硬度增加了大约2个数量级。