铝酸钠电解液中利用等离子体电解氧化技术在铸态A356铝合金表面制备高耐磨、耐蚀涂层（英文）

发布时间：2018-03-29 05:31

本文选题：A铝合金　切入点：铝酸钠　出处：《Transactions of Nonferrous Metals Society of China》2017年02期

【摘要】：在铝酸钠电解液中利用等离子体电解氧化(PEO)技术对铸态A356合金进行处理制备耐磨、耐蚀涂层。采用3种不同浓度的铝酸钠溶液(2、16和24 g/L NaAlO_2)以及硅酸盐溶液(用以比较)制备涂层。利用球-块式干摩擦微动磨损试验(对磨材料为碳化钨)和电化学试验评价涂层的磨损和耐蚀性能。结果表明,在24 g/L NaAlO_2溶液中处理480 s形成的氧化膜涂层具有最佳的保护性能。该涂层在30 N载荷下摩擦1800 s,其磨损率仅约为~4.5×10~(-7) mm~3/(N·m)。同时,该涂层具有很低的腐蚀电流密度(约为8.81×10~(-9) A/cm~2)。该实验发现,尽管膜层中α-Al_2O_3含量很低,涂层的致密程度和单层结构保证了其优异的性能。
[Abstract]:The as-cast A356 alloy was treated by plasma electrolytic oxidation (PEO) technique in sodium aluminate electrolyte to prepare wear resistance. Corrosion resistant coatings-preparation of coatings using three different concentrations of sodium aluminate solutions (2o 16 and 24 g / L NaAlO 2) and silicate solutions (for comparison)-ball-block dry friction fretting wear test (tungsten carbide for grinding materials) and electrolysis. The wear and corrosion resistance of the coatings were evaluated. The coating formed by treating 480s in 24 g / L NaAlO_2 solution has the best protective performance. The wear rate of the coating is only about 4.5 脳 10 ~ (-7) mm~3/(N / m ~ (-1) at 30 N load for 1800 s. At the same time, the wear rate of the coating is about 4.5 脳 10 ~ (-7) mm~3/(N / m ~ (-1). The coating has a very low corrosion current density (about 8.81 脳 10 ~ (-9)) A / cm ~ (2 +). It is found that, despite the low 伪 -Al _ 2O _ 3 content in the coating, the density of the coating and its monolayer structure ensure its excellent performance.
【作者单位】：湖南大学材料科学与工程学院;
【基金】：Projects(51071066,51671084)supported by the National Natural Science Foundation of China Project(NCET-12-0172)supported by the Program for New Century Excellent Talents in University,Ministry of Education,China
【分类号】：TG174.4

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