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Zr-based coating for the prevention of silver tarnishing

刊名：	Anti-Corrosion Methods and Materials
作者：	Jan Stoulil（Department of Metals and Corrosion Engineering, Institute of Chemical Technology） Martina Anisova（Department of Metals and Corrosion Engineering, Institute of Chemical Technology） Eva Mistova（Department of Power Engineering, Institute of Chemical Technology） Jaroslav Fojt（Department of Metals and Corrosion Engineering, Institute of Chemical Technology）
刊号：	778C0002
出版年：	2014
年卷期：	2014, vol.61, no.1
页码：	38-43
总页数：	6
分类号：	TG17
关键词：	Corrosion；Electrochemistry；Microscopy；Silver tarnish；Surface preparation；ZrO_2 coating
参考中译：
语种：	eng
文摘：	Purpose - This work aims to focus on evaluation of the ability of cathodically deposited ZrO_2-based coatings to stabilise the surface of silver against tarnishing caused by S~(2-)-based species and comparison of these coatings with Cr oxide-based coating. Design/methodology/approach - The coatings were evaluated using inductively coupled plasma optical emission spectroscopy (ICP-OES), scanning electron microscopy (SEM), impedance spectroscopy (EIS) and galvanostatic reduction of specimens exposed to H_2S vapours. Findings - The kinetics of deposition were studied and optimum conditions for coating formation were determined. The options of manual application suitable for practical use were studied also. Zr specimens showed better barrier properties than did a chromated specimen. The best properties were observed on a specimen with a manually fast-applied coating. However, Zr coating does not provide as good protection from tarnishing as chromate. The structure of the Cr coating contains species of chromate that oxidize species of S~(2-). Originality/value - The paper provides new information regarding the anticorrosive properties of cathodically deposited ZrO_2 coating as an alternative to Cr coating for the preservation of silver surfaces.