Characterization of salt particle induced corrosion processes by synchrotron generated x-ray fluorescence and complementary surface analysis tools.

Neufeld, A. K. ; Cole, I. S. ; Bond, A. M. ; Isaacs, H. S. ; Furman, S. A.

Technical Information Center Oak Ridge Tennessee

关键词: Corrosive effects;    X-ray fluorescence analysis;    Brines;    Corrosion;    X-ray spectroscopy;   

RP-ID  :  DE2001782050

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The benefits of using synchrotron-generated X-rays and X-ray fluorescence analysis in combination with other surface analysis techniques have been demonstrated. In studies of salt-induced corrosion, for example, the detection of Rb ions in the area of secondary spreading when salt-containing micro-droplets are placed on zinc surfaces, further supports a mechanism involving cation transport during the corrosion and spreading of corrosive salt on exposed metal surfaces. Specifically, the new analytical data shows that: (a) cations are transported radially from a primary drop formed from a salt deposit in a thin film of secondary spreading around the drop; (b) subsequently, micro-pools are formed in the area of secondary spreading, and it is likely that cations transported within the thin film accumulate in these micro-pools until the area is dehydrated; (c) the mechanism of cation transport into the area of secondary spreading does not include transport of the anions; and (d) hydroxide is the counter ion formed from oxygen reduction at the metal surface within the spreading layer. Data relevant to iron corrosion is also presented and the distinct differences relative to the zinc situation are discussed.