Formation of carbonaceous-coatings on aluminium using poly(vinyl alcohol)
Formation of carbonaceous-coatings on aluminium using poly(vinyl alcohol)
复制标题
使用聚乙烯醇在铝上形成碳质涂层
DOI：
10.1016/s0955-2219(00)00015-7
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发表时间：
2000
影响因子：
5.7
通讯作者：
M. Inagaki
中科院分区：
文献类型：
--
作者：
H. Konno;Kyoko Oyamada;M. Inagaki
通过以下两步工艺在铝上形成均匀和粘附的碳涂层：首先，铝试样在酸性溶液中阳极氧化以形成多孔阳极氧化膜;然后将它们与聚乙烯醇（PVA）粉末在流动氩气中在300°C下加热30 min，然后在450-550°C的不同温度下加热1 h。在电解抛光和阳极氧化试样上，涂层显示出镜面般的光滑度。涂层在没有多孔氧化膜的试样上失效。因此，PVA分解过程中形成的流体材料渗透到多孔氧化物膜的孔中对于粘附是重要的。这种锚效应通过扫描电子显微镜证实。表面的维氏硬度通过涂覆和通过增加涂覆过程的温度而增加。最高值为Hν50=850。在450°C下涂覆的试样在NaCl溶液中的耐点蚀性显著增加。该涂层还耐1 mol l−1HCl溶液和有机溶剂如丙酮和己烷。
Uniform and adhesive carbonaceous-coatings were formed on the aluminium by the following two-step process: first, aluminium specimens were anodized in acid solutions to form porous anodic oxide films; they were then heated with powder of poly(vinyl alcohol) (PVA) in flowing argon at 300°C for 30 min then at different temperatures of 450–550°C for 1 h. The coatings showed mirror-like smoothness on the electropolished and anodized specimens. The coating failed on specimens without the porous oxide films. The penetration of the fluid materials formed in the course of the decomposition of PVA into the pores of the porous oxide film was accordingly important for adhesion. This anchor effect was confirmed by scanning electron microscopy. The Vickers hardness of the surface was increased by coating and by increasing temperature of the coating process. The highest value was Hν50=850. The resistance to pitting corrosion in a NaCl solution was markedly increased in specimens coated at 450°C. The coating is resistant also to 1 mol l−1HCl solution and to organic solvents such as acetone and hexane.