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	Corrosion behaviour of hot dip zinc and zinc-aluminium coatings on steel in seawater
	Li, Y
刊名	BULLETIN OF MATERIALS SCIENCE
	2001-08-01
卷号	24期号:4页码:355-360
关键词	Galvanization By Hot Dipping Zn-al Alloy Coating Seawater Corrosion Pitting Corrosion Cathodic Protection
ISSN号	0250-4707
文献子类	Article
英文摘要	A comparative investigation of hot dip Zn-25Al alloy, Zn-55Al-Si and Zn coatings on steel was performed with attention to their corrosion performance in seawater. The results of 2-year exposure testing of these at Zhoushan test site are reported here. In tidal and immersion environments, Zn-25Al alloy coating is several times more durable than zinc coating of double thickness. At long exposure times, corrosion rate for the Zn-25Al alloy coating remains indistinguishable from that for the Zn-55Al-Si coating of similar thickness in tidal zone, and is two to three times lower than the latter in immersion zone. The decrease in tensile strength suggested that galvanized and Zn-55Al-Si coated steel suffer intense pitting corrosion in immersion zone. The electrochemical tests showed that all these coatings provide cathodic protection to the substrate metal; the galvanic potentials are equal to - 1,050, - 1,025 and - 880 mV (SCE) for zinc, Zn-25Al alloy and Zn-55Al-Si coating, respectively, which are adequate to keep the steel inside the immunity region. It is believed that the superior performance of the Zn-25Al alloy coating is due to its optimal combination of the uniform corrosion resistance and pitting corrosion resistance. The inferior corrosion performance by comparison of the Zn coating mainly results from its larger dissolution rate, while the failure of the Zn-55Al-Si coating is probably related to its higher susceptibility to pitting corrosion in seawater.; A comparative investigation of hot dip Zn-25Al alloy, Zn-55Al-Si and Zn coatings on steel was performed with attention to their corrosion performance in seawater. The results of 2-year exposure testing of these at Zhoushan test site are reported here. In tidal and immersion environments, Zn-25Al alloy coating is several times more durable than zinc coating of double thickness. At long exposure times, corrosion rate for the Zn-25Al alloy coating remains indistinguishable from that for the Zn-55Al-Si coating of similar thickness in tidal zone, and is two to three times lower than the latter in immersion zone. The decrease in tensile strength suggested that galvanized and Zn-55Al-Si coated steel suffer intense pitting corrosion in immersion zone. The electrochemical tests showed that all these coatings provide cathodic protection to the substrate metal; the galvanic potentials are equal to - 1,050, - 1,025 and - 880 mV (SCE) for zinc, Zn-25Al alloy and Zn-55Al-Si coating, respectively, which are adequate to keep the steel inside the immunity region. It is believed that the superior performance of the Zn-25Al alloy coating is due to its optimal combination of the uniform corrosion resistance and pitting corrosion resistance. The inferior corrosion performance by comparison of the Zn coating mainly results from its larger dissolution rate, while the failure of the Zn-55Al-Si coating is probably related to its higher susceptibility to pitting corrosion in seawater.
学科主题	Materials Science, Multidisciplinary
语种	英语
WOS记录号	WOS:000170363400002
公开日期	2010-12-21
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/2345]
专题	海洋研究所_海洋腐蚀与防护研究发展中心
作者单位	Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Li, Y. Corrosion behaviour of hot dip zinc and zinc-aluminium coatings on steel in seawater[J]. BULLETIN OF MATERIALS SCIENCE,2001,24(4):355-360.
APA	Li, Y.(2001).Corrosion behaviour of hot dip zinc and zinc-aluminium coatings on steel in seawater.BULLETIN OF MATERIALS SCIENCE,24(4),355-360.
MLA	Li, Y."Corrosion behaviour of hot dip zinc and zinc-aluminium coatings on steel in seawater".BULLETIN OF MATERIALS SCIENCE 24.4(2001):355-360.

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