Failure mechanism of organic coatings overlaid on arc sprayed coatings
Authors: Fu, D.X.1; Xu, B.S.2; Zhang, W.2; Wei, S.C.2; Liu, Y.2
Source: Surface Engineering, Volume 25, Number 8, November 2009 , pp. 612-614(3)
Publisher: Maney Publishing
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Abstract:
A general mechanism of corrosion degradation of organic coatings overlaid on Al and Zn-Al-Mg-RE (rare earth) coatings was investigated. The metallic coatings were prepared by the high velocity arc spraying (HVAS) technology. Artificial defects were introduced in the organic coatings and the samples were immersed in 5 wt-%NaCl aqueous solution. After 430 h, the different microstructures of corrosion products in the defects were studied by scanning electron microscopy. The microstructure of corrosion products of the HVAS Zn-Al-Mg-RE coating was more compact than that of the HVAS Al coating. The compact corrosion products were better barriers against chloride ions and water permeation, and the defects in the system were blocked by the corrosion products.Keywords: ZN-AL-MG-RE COATING; CORROSION; ARTIFICIAL DEFECTS; ORGANIC COATINGS
Document Type: Research article
DOI: 10.1179/174329408X305365
Affiliations: 1: GRIPM Advanced Materials Co. Ltd, General Research Institute for Nonferrous Metals, Beijing 101407, China, National Key Laboratory for Remanufacturing, Beijing 100072, China;, Email: fdx2007@yahoo.com.cn 2: National Key Laboratory for Remanufacturing, Beijing 100072, China
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