{"title":"The corrosion behaviour of nickel in molten NaNO3KNO3 eutectic","authors":"A. Baraka, R.M.S. Baraka, A. Abdel-Razik","doi":"10.1016/0376-4583(85)90116-5","DOIUrl":null,"url":null,"abstract":"<div><p>The corrosion (oxidation) of nickel in molten (Na, K)NO<sub>3</sub> eutectic has been investigated at temperatures ranging from 250 °C to 450 °C, for exposure periods of up to 12 h. The results of both weight-gain and potential measurements under open-circuit conditions reveal the formation of a passivating film consisting mainly of NiO. The thickening of the oxide film proceeds according to a parabolic law, at a rate depending on the temperature of the melt. The activation energy of the process was estimated to be 14.95 kcal mol<sup>−1</sup>, indicating that the oxidation process of nickel is determined by diffusion of nickel in the form of ions and electrons via vacancies and holes. A break was observed in the parabolic plots at higher temperatures; this may indicate a change in the mechanism of film growth. The results are discussed in terms of oxidation kinetics data for nickel in both molten nitrates and air at high temperatures.</p></div>","PeriodicalId":22037,"journal":{"name":"Surface Technology","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1985-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0376-4583(85)90116-5","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Surface Technology","FirstCategoryId":"1087","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0376458385901165","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
Abstract
The corrosion (oxidation) of nickel in molten (Na, K)NO3 eutectic has been investigated at temperatures ranging from 250 °C to 450 °C, for exposure periods of up to 12 h. The results of both weight-gain and potential measurements under open-circuit conditions reveal the formation of a passivating film consisting mainly of NiO. The thickening of the oxide film proceeds according to a parabolic law, at a rate depending on the temperature of the melt. The activation energy of the process was estimated to be 14.95 kcal mol−1, indicating that the oxidation process of nickel is determined by diffusion of nickel in the form of ions and electrons via vacancies and holes. A break was observed in the parabolic plots at higher temperatures; this may indicate a change in the mechanism of film growth. The results are discussed in terms of oxidation kinetics data for nickel in both molten nitrates and air at high temperatures.
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