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Effect of Anodizing Time on the Surface Morphology and Corrosion Resistance of AZ31 Magnesium Alloy

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The anodizing of AZ31 magnesium alloy in 1 M NaOH alkaline solution at a constant potential of 100 V was investigated. The corrosion resistance of the anodic film was characterized using potentiodynamic polarization and a salt spray test. The surface morphology and phase structure of the anodic film were analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the anodic film could form in a very short time (0.5 s), but the grown film was not sufficient to protect the magnesium substrate against corrosion. The thickness of the anodic film increased with the anodizing time up to 30 s, and then it slightly decreased with the anodizing time up to 600 s. The corrosion resistance was enhanced with anodizing, and good quality protection was achieved at an anodizing time of 2 s. No notable enhancement of this property could be observed by increasing the anodizing time over 2 s.
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Document Type: Research Article

Publication date: January 1, 2015

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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