期刊
CORROSION SCIENCE
卷 139, 期 -, 页码 421-429出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.04.024
关键词
Magnesium; Iron; Tolerance limit; Corrosion potential; Surface film breakdown
资金
- National Nature Science Foundation of China [51601036]
- Fundamental Research Funds for the Central Universities [N162410002-2-4, N170204010]
- UK Engineering and Physical Sciences Research Council [EP/1038616/1]
- EPSRC [EP/I038616/1] Funding Source: UKRI
The present work investigates the corrosion behaviour of magnesium with different Fe contents. It is found that the micro-galvanic coupling between Fe-rich particles and magnesium matrix results in surface film formation and decrease in anodic reaction rate, consequently, increase of corrosion potential. Depending on the population density of Fe-rich particle, if the corrosion potential increases to the breakdown potential of surface film, localized corrosion initiates at the sites of breakdown. It is observed that Mg with different Fe contents exhibit the same critical potential value for corrosion initiation. Thus, corrosion potential is a critical factor for the corrosion tolerance limit of Fe in Mg.
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