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Rare Metals
Erschienen in: Rare Metals 10/2016

01.10.2016

Electrochemical behaviors of magnesium alloy with phosphate conversion coating in NaCl solutions

verfasst von: Li-Hua Fu, Chao-Fang Dong, Xiao-Gang Li, Wei Han

Erschienen in: Rare Metals | Ausgabe 10/2016

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Abstract

A composite conversion coating was prepared on magnesium alloy by the only one-step immersion treatment. The characteristics of the conversion coating were investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results indicate that the composite conversion coating consists of magnesium hydroxide, magnesium phosphate and manganese phosphate. The electrochemical behavior of the conversion coating was investigated systematically by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurement in different NaCl solutions. Polarization measurements and EIS results reveal that the magnesium alloy with the conversion coating have better corrosion resistance compared to the bare magnesium alloy in these conditions. And the corrosion rate of the magnesium alloy with conversion coating increases consistently with the chloride ion concentration. In alkaline conditions, the magnesium alloy with conversion coating has superior corrosion resistance by the synergistic effects between Mg(OH)2 film and conversion coating. Moreover, the electrochemical corrosion mechanism of the magnesium alloy was analyzed with respect to the conversion coating in a Cl− containing environment.
Vorheriger Artikel Preparation and high-frequency soft magnetic property of FeCo-based thin films
Nächster Artikel Corrosion behaviors for peak-aged Mg–7Gd–5Y–1Nd–0.5Zr alloys with oxide films

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Metadaten
Titel
Electrochemical behaviors of magnesium alloy with phosphate conversion coating in NaCl solutions
verfasst von
Li-Hua Fu
Chao-Fang Dong
Xiao-Gang Li
Wei Han
Publikationsdatum
01.10.2016
Verlag
Nonferrous Metals Society of China
Erschienen in
Rare Metals / Ausgabe 10/2016
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI
https://doi.org/10.1007/s12598-016-0784-6

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