R.M Saleh, F.M.Abdel Wahab, M.M Badran, A.A El Hosary
{"title":"A simple method for the determination of coating thickness of galvanized steel","authors":"R.M Saleh, F.M.Abdel Wahab, M.M Badran, A.A El Hosary","doi":"10.1016/0390-6035(82)90087-6","DOIUrl":null,"url":null,"abstract":"<div><p>The dissolution of galvanized steel in acid solution was followed by thermometric, potential-time and weight loss techniques. In HCl and H<sub>2</sub>SO<sub>4</sub>, only the zinc coat is attacked, while in HNO<sub>3</sub>, curves representing stepwise dissolution of the coating layer and steel base are obtained. The time, t, required for complete dissolution of the zinc coat as measured by the three techniques is comparable.</p><p>Dissolution of steel pieces of different coating thickness has been examine in 1 M H<sub>2</sub>SO<sub>4</sub> by the thermometric method. Starting from the initial temperature, T<sub>i</sub>, t, then temperature of the system rises to attain a maximum value, T<sub>m</sub>, after a time, t, then decreases. Up to 6 g/dm<sup>2</sup> coating thickness, both <em>Δ</em>T(T<sub>m</sub> − T<sub>i</sub>) and t vary linearly with coating thickness. The results suggest the thermometric method for the determination of coating thickness of galvanized steel.</p></div>","PeriodicalId":18221,"journal":{"name":"Materials Chemistry","volume":"7 2","pages":"Page 285"},"PeriodicalIF":0.0000,"publicationDate":"1982-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-6035(82)90087-6","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0390603582900876","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The dissolution of galvanized steel in acid solution was followed by thermometric, potential-time and weight loss techniques. In HCl and H2SO4, only the zinc coat is attacked, while in HNO3, curves representing stepwise dissolution of the coating layer and steel base are obtained. The time, t, required for complete dissolution of the zinc coat as measured by the three techniques is comparable.
Dissolution of steel pieces of different coating thickness has been examine in 1 M H2SO4 by the thermometric method. Starting from the initial temperature, Ti, t, then temperature of the system rises to attain a maximum value, Tm, after a time, t, then decreases. Up to 6 g/dm2 coating thickness, both ΔT(Tm − Ti) and t vary linearly with coating thickness. The results suggest the thermometric method for the determination of coating thickness of galvanized steel.
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