Enhancement of corrosion resistance of Mg-9 wt.% Al-1 wt.% Zn alloy by a calcite (CaCO3) conversion hard coating

Autor:	Jun-Yen Uan, B.L. Yu, X.L. Pan
Rok vydání:	2010
Předmět:	Calcite Materials science Aqueous solution General Chemical Engineering Metallurgy Alloy General Chemistry engineering.material Microstructure Corrosion Dielectric spectroscopy chemistry.chemical_compound chemistry Coating Conversion coating engineering General Materials Science Nuclear chemistry
Zdroj:	Corrosion Science. 52:1874-1878
ISSN:	0010-938X
DOI:	10.1016/j.corsci.2010.01.014
Popis:	A calcite (CaCO 3 ) coating on Mg alloy, formed by chemical conversion treatment, was investigated. Aqueous Ca 2 + / HCO 3 - with Ca 2+ concentration of ∼220 ppm was employed in the chemical conversion treatment. Cross-sectional microstructures of the coated sample after 2 h of treatment revealed a two-layer coating structure. The corrosion current density ( I corr ) of the coated sample was approximately two orders of magnitude lower than that of the untreated sample. Electrochemical impedance spectroscopy (EIS) and an appropriate equivalent circuit suggested that each of the layers of the two-layer coating effectively protects Mg alloy against corrosion.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4041ee5ee09e03c714bbf6fb3d5e9c76 https://doi.org/10.1016/j.corsci.2010.01.014 Zobrazit plný text záznamu Full Text from ScienceDirect