한국주조공학회지 (Journal of Korea Foundry Society)

  • 제36권2호
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  • Pages.60-66
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  • 2016
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  • 1598-706X(pISSN)
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  • 2288-8381(eISSN)
한국주조공학회 (Korea Foundry Society)
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금형 주조한 GZ21 합금과 AZ91 합금의 부식특성 비교

Comparison of Electrochemical Corrosion Properties of Permanent Mold Casting GZ21 Alloy and AZ91 Alloy

  • 투고 : 2016.01.05
  • 심사 : 2016.03.14
  • 발행 : 2016.04.30
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초록

In this study, comparison of corrosion properties of the Mg-1.5Ge-1Zn (GZ21) alloy and Mg-9Al-1Zn (AZ91) alloy were investigated. The studied alloys were fabricated by permanent mold casting method. And the potentiodynamic test, hydrogen evolution test, immersion test and A.C Impedance test were carried out in a 3.5% NaCl solution with pH7.2 at room temperature to measure the corrosion properties. The microstructure of GZ21 alloy was composed of ${\alpha}-Mg$ and $Mg_2Ge$ phases and AZ91 alloy was composed of ${\alpha}-Mg$ and $Mg_{17}Al_{12}$ phases. From the test results, the corrosion property was improved by adding Ge. It seemed that the corrosion mechanism was changed from galvanic corrosion (AZ91) to filiform corrosion (GZ21).

키워드

참고문헌

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피인용 문헌

  1. Grain Refinement를 통한 Mg-Ca-Zn합금의 기계적 특성 및 부식 특성 향상 vol.18, pp.9, 2017, https://doi.org/10.5762/kais.2017.18.9.418