Thomas Fickenscher, Jasmin Schröer, Olaf Reckeweg, Rainer Pöttgen
{"title":"Brass corrosion – dezincification in hydrochloric acid","authors":"Thomas Fickenscher, Jasmin Schröer, Olaf Reckeweg, Rainer Pöttgen","doi":"10.1515/znb-2024-0052","DOIUrl":null,"url":null,"abstract":"Brass is among the utility metals for daily life. We present an easy corrosion experiment for demonstration in high school or first-year undergraduate studies. Almost any kind of brass can be dezincified in 1 <jats:sc>m</jats:sc> hydrochloric acid. Copper as the noble component remains as salmon pink coating on the workpiece while zinc and lead, the latter being a frequent minor alloying component of brass, are dissolved. Lead can be detected as PbS (<jats:italic>in-situ</jats:italic> generation of H<jats:sub>2</jats:sub>S from a splinter of FeS or as PbI<jats:sub>2</jats:sub> using KI). Zinc can be analyzed as Rinmann’s green or via a microchemical drop reaction with dithizone.","PeriodicalId":23831,"journal":{"name":"Zeitschrift für Naturforschung B","volume":"22 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Zeitschrift für Naturforschung B","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1515/znb-2024-0052","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
Brass is among the utility metals for daily life. We present an easy corrosion experiment for demonstration in high school or first-year undergraduate studies. Almost any kind of brass can be dezincified in 1 m hydrochloric acid. Copper as the noble component remains as salmon pink coating on the workpiece while zinc and lead, the latter being a frequent minor alloying component of brass, are dissolved. Lead can be detected as PbS (in-situ generation of H2S from a splinter of FeS or as PbI2 using KI). Zinc can be analyzed as Rinmann’s green or via a microchemical drop reaction with dithizone.
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