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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 4    August 2009

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Improvement of corrosion resistance of AZ31 Mg alloy by anodizing with co-precipitation of cerium oxide
Salah Abdelghany SALMAN, Ryoichi ICHINO, Masazumi OKIDO

Department of Material Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku,
Nagoya, 464-8603, Japan

Abstract:Anodizing of AZ31 Mg alloy in NaOH solution by co-precipitation of cerium oxide was investigated. The chemical composition and phase structure of the coating film were determined via optical microscopy, SEM and XRD. The corrosion properties of the anodic film were characterized by using potentiodynamic polarization curves in 17 mmol/L NaCl and 0.1 mol/L Na2SO4 solution at 298 K. The corrosion resistance of AZ31 magnesium alloy is significantly improved by adding cerium oxide to alkaline solution. In addition, the surface properties are enhanced and the film contains no crack.

 

Key words: anodizing; AZ31 Mg alloy; corrosion; alkaline solution

ISSN 1672-7029
CN 43-1423/U

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