Corrosion Resistance of Micro-arc Oxidation and Sol-gel Composite Coating on Magnesium Alloy by Cyclic Heat-NaCl Solution Spray/dry Test

Journal of Chinese Society for Corrosion and protection

2013, Vol. 33

Issue (5): 435-440 DOI:

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Corrosion Resistance of Micro-arc Oxidation and Sol-gel Composite Coating on Magnesium Alloy by Cyclic Heat-NaCl Solution Spray/dry Test

SHI Huiying, YANG Chaojing, ZHANG Mian

Material Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

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Abstract A composite coating was prepared by means of micro-arc oxidation (MAO) and sol-gel technique on a magnesium alloy, the coating consisted of a micro-arc oxidation (MAO) sub-layer and sol-gel top-layer. The corrosion resistance of the composite coating was examined by cyclic heat-NaCl solution spray/dry test, while the free corrosion potential of the coated alloy was measured in Na₂Cl solution. Then the surface topography and adhesion of the composite coating were characterized by SEM with EDS, and cross cut test respectively. The results show that white spots appeared on the coating surface due to cyclic corrosion test and the number of spots increased with time. The adhesion of composite coatings is good. The coating exhibits a free corrosion potential about -1.43 V, and a rather good adhesion to the substrate. It is observed that there exist many micro-cracks and holes on the coating surface, however the number and size of which reduced with the increase of cyclic corrosion time; and a few corrosion pits can be observed until 720 h corrosion test. It follows that the applied sol-gel permeated into and then sealed the cracks and holes on the coating, thus enhanced the protectiveness of the later.

Key words: magnesium alloy micro-arc oxidation sol-gel heat-spray/dry cyclic corrosion
resistance

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TG174.3+1

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SHI Huiying,YANG Chaojing,ZHANG Mian. Corrosion Resistance of Micro-arc Oxidation and Sol-gel Composite Coating on Magnesium Alloy by Cyclic Heat-NaCl Solution Spray/dry Test. Journal of Chinese Society for Corrosion and protection, 2013, 33(5): 435-440.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2013/V33/I5/435

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