{"title":"Fe oxychloride desorption from an Fe polycrystalline surface","authors":"E. Murray, J. Prasad, J.A. Kelber","doi":"10.1016/0167-2584(93)91009-D","DOIUrl":null,"url":null,"abstract":"<div><p>We report the formation of an Fe oxychloride species at the surface of an O- and Cl-covered Fe polycrystalline surface below 230 K under UHV conditions. Our data show that FeOCl (amu 107) desorbs at 230 K. For FeCl<sub>2</sub> (amu 126) desorption, two desorption peaks are observed at 230 and 620 K in the presence of chemisorbed oxygen. In the absence of oxygen, only one FeCl<sub>2</sub> desorption peak at 620 K is observed. Auger electron spectroscopy and temperature programmed desorption studies reveal that the reaction leading to Fe oxychloride formation involves dissociatively adsorbed O and Cl at the Fe surface. These results indicate that chemisorbed or low coordinate oxygen plays an important and previously unsuspected role in chloride-induced corrosion at ferrous surfaces.</p></div>","PeriodicalId":101188,"journal":{"name":"Surface Science Letters","volume":"295 1","pages":"Pages L993-L997"},"PeriodicalIF":0.0000,"publicationDate":"1993-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-2584(93)91009-D","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Surface Science Letters","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/016725849391009D","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
We report the formation of an Fe oxychloride species at the surface of an O- and Cl-covered Fe polycrystalline surface below 230 K under UHV conditions. Our data show that FeOCl (amu 107) desorbs at 230 K. For FeCl2 (amu 126) desorption, two desorption peaks are observed at 230 and 620 K in the presence of chemisorbed oxygen. In the absence of oxygen, only one FeCl2 desorption peak at 620 K is observed. Auger electron spectroscopy and temperature programmed desorption studies reveal that the reaction leading to Fe oxychloride formation involves dissociatively adsorbed O and Cl at the Fe surface. These results indicate that chemisorbed or low coordinate oxygen plays an important and previously unsuspected role in chloride-induced corrosion at ferrous surfaces.
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