期刊
SURFACE & COATINGS TECHNOLOGY
卷 204, 期 24, 页码 4095-4100出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.05.039
关键词
Cerium conversion coating; Corrosion; Aluminum alloy; Subsurface crevices; 2024-T3
资金
- Strategic Environmental Research and Development Program (SERDP) [W912HQ-08-C-0008]
The processing variables that contributed to the formation of subsurface crevices under cerium-based conversion coatings on AA 2024-T3 were investigated. Focused ion beam milling revealed the presence of subsurface crevices underneath a small fraction (similar to 10%) of coated areas, typically in areas with large cracks through the coatings. A solution of sodium chloride and H(2)O(2) etched AA 2024-T3 and produced features similar to subsurface crevices, which confirmed that crevices formed during deposition due to the composition of the coating solution. Using sodium nitrate in place of sodium chloride resulted in no etching of the substrate. Thus, coatings free of subsurface crevices could be produced by using cerium nitrate instead of cerium chloride in the coating solution. Electrodeposited coatings, even those deposited from solutions containing chloride ions and H(2)O(2), were also free of subsurface crevices. As a result, subsurface crevices are not inherent to cerium-based conversion coatings, but rather were formed due to certain process parameters, specifically the presence of chloride ions and hydrogen peroxide in the coating solution. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据