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论文类型：期刊论文

发表时间：2010-08-01

发表刊物：SURFACE ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：26

期号：6

页面范围：399-406

ISSN号：0267-0844

关键字：Arc sprayed aluminium coating; Hydrothermal sealing treatment; Corrosion resistance; Aluminium hydroxide

摘要：In this study, traditional hydrothermal sealing (HTS) treatment was for the first time employed to arc sprayed pure aluminium coatings, and proves to be a successful sealing method. Corrosion performances were examined in salt solution immersion test (SSIT) and electrochemical polarisation measurements. The HTS coating is covered with a continuous film of aluminium hydroxide structures, and some deionised water manages to penetrate. Besides, pores in the surface as well as in the inner part get smaller and fewer. In SSIT, the HTS coating has a similar corrosion process to the unsealed one, but corrodes much more slightly. In polarisation curves, the HTS coating exhibits a wide passive region, higher corrosion potential and lower current density than the unsealed coating before immersion. After SSIT, it exhibits small changes in polarisation curves, implying slight corrosion in 90 days immersion and proving much higher corrosion resistance than the unsealed coating in the whole process.