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A novel method to detect cathodic second-phase particles in Mg alloys

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Abstract

In this work, a new method for detecting cathodic second-phase particles on the Mg alloy surface has been developed based on in situ observation of the blade-abraded surfaces of AZ31, AZ61, and 99.9 % pure Mg during the immersion in concentrated alkaline solutions. Continuous local gas evolutions were observed at certain points on the blade-abraded surface, and second-phase particles were found at the same positions, revealing the presence of cathodic particles at the gas evolution sites. The continuous local gas evolution reaction was found to be coupled with not only oxide formation reaction on the Mg matrix around the cathodic particles but also dissolution of Mg at the area within 2–3 μm distance from the cathodic particle. The gas evolution rate appeared to be proportional to the size of cathodic particles, and various cathodic particles containing Fe, Mn, Al, and/or Si were found to be present in the Mg alloys. Based upon the experimental results, it is concluded that the new method is simple, fast, and non-destructive, and it can be used to detect all the cathodic second-phase particles present on the entire surface of Mg alloys, irrespective of the sample shape and size.

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Acknowledgments

This research was financially supported by the research grant of general research program (PNK3632) from Korea Institute of Materials Science. One of the authors (SIP) would like to also express his heartfelt gratitude to Professor Dr.-Eng. Suk-Joong L Kang, Department MSE, KAIST for his full support to continuing scientific work.

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Authors and Affiliations

  1. Korea Institute of Materials Science, Changwon, South Korea

    Sungmo Moon & Cheolnam Yang

  2. Korea University of Science and Technology, Changwon, South Korea

    Sungmo Moon

  3. Korea Advanced Institute of Science and Technology, Daejeon, South Korea

    Su-Il Pyun

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  1. Sungmo Moon
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  2. Cheolnam Yang
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  3. Su-Il Pyun
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Correspondence to Sungmo Moon.

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Moon, S., Yang, C. & Pyun, SI. A novel method to detect cathodic second-phase particles in Mg alloys. J Solid State Electrochem 19, 3491–3499 (2015). https://doi.org/10.1007/s10008-015-2768-0

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  • DOI: https://doi.org/10.1007/s10008-015-2768-0

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