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Improvement of corrosion resistance of rare earth element (REE)-based anodic oxidation coating on AZ91D magnesium alloy


Zain, M.Z.M. and Illias, S. and Salleh, Mohamed Najib and Ismail, K. Azwan and Nooraizedfiza, Z. (2012) Improvement of corrosion resistance of rare earth element (REE)-based anodic oxidation coating on AZ91D magnesium alloy. Applied Mechanics and Materials, 187. pp. 210-214. ISSN 1662-7482

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Abstract

Anodization is a useful technique for forming protective films on magnesium alloys and improves its corrosion resistance. Based on the rare earth metal (REE) salt solution, the optimum parameter was selected by comparing the anti-corrosion property of anodic film. The structure, component and surface morphology of anodic film and cross-section were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) coupled with Energy Dispersive Spectroscopy (EDS). The corrosion behavior was evaluated by immersion test. In this paper, a dense anodic film approximately 20 µm thick was prepared on a AZ91D magnesium alloy through anodic oxidation coating. The results show that the anodic films were mainly composed of Mg17Al12, Mg17La2, MgO and amorphous compounds. The best corrosion resistance was obtained with specimen anodized in solution containing both lanthanum nitrate and magnesium, whose corrosion resistance is approximately 3 times higher than that of as-received AZ91D magnesium alloy.

Item Type: Article
Uncontrolled Keywords: Anodization, Corrosion Resistance, Magnesium Alloy, Rare Earths Element
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: School of Technology Management & Logistics
Depositing User: Dr. Mohamed Najib Salleh
Date Deposited: 22 Mar 2016 03:41
Last Modified: 21 Apr 2016 03:35
URI: http://repo.uum.edu.my/id/eprint/17670

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