A Study on the Corrosion Behavior of Magnesium Alloy Sealed with Chemical Conversion Coating and Sol-gel Coating

이동욱; Shivshankar Chaudhari; 최성용; 문명준; 손민영

doi:10.14773/cst.2021.20.4.175

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자료유형: 학술저널

저자정보: 이동욱 (부경대학교) Shivshankar Chaudhari (부경대학교) 최성용 (부경대학교) 문명준 (부경대학교) 손민영 (부경대학교)

저널정보: 한국부식방식학회 Corrosion Science and Technology CORROSION SCIENCE AND TECHNOLOGY 제20권 제4호

발행연도: 2021.8

수록면: 175 - 182 (8page)

DOI: 10.14773/cst.2021.20.4.175

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Magnesium alloy is limited in the industrial field because its standard electrode potential is ?2.363 V vs. NHE (Normal Hydrogen Electrode) at 25 oC. This high electrochemical activity causes magnesium to quickly corrode with oxygen in air; chemical conversion coating prevents corrosion but causes surface defects like cracks and pores. We have examined the anti-corrosion effect of sol-gel coating sealed on the defected conversion coating layer. Sol-gel coatings produced higher voltage current and smaller pore than the chemical conversion coating layer. The conversion coating on magnesium alloy AZ31 was prepared using phosphate-permanganate solution. The sol-gel coating was designed using trimethoxymethylsilane (MTMS) and (3-Glycidyloxypropyl) trimethoxysilane (GPTMS) as precursors, and aluminum acetylacetonate as a ring-opening agent. The thermal shock resistance was tested by exposing specimens at 140 oC in a convection oven; the results showed changes in the magnesium alloy AZ31 surface, such as oxidization and cracking. Scanning electron microscope (FE-SEM) analysis confirmed a sealed sol-gel coating layer on magnesium alloy AZ31. Electrochemical impedance spectroscopy (EIS) measured the differences in corrosion protection properties by sol-gel and conversion coatings in 0.35 wt% NaCl solution, and the potentiodynamic polarization test and confirmed conversion coating with the sol-gel coating show significantly improved resistance by crack sealing.

#Sol-gel coating #EIS #Chemical conversion coating #Polarization test #Thermal shock test

참고문헌 (15)

참고문헌 신청

Dong Han / 2020 / A review on ignition mechanisms and characteristics of magnesium alloys / Journal of Magnesium and Alloys 8(2):329~344

William J. Joost / 2017 / Towards magnesium alloys for high-volume automotive applications / Scripta Materialia 128:107~112

Mark Easton / 2008 / Magnesium alloy applications in automotive structures / JOM 60(11):57~62

Wei Gan / 2020 / WITHDRAWN: Study on surface modification and properties of the AZ91D magnesium alloy used for automobile engine / Journal of Materials Research and Technology

G. Song / 2005 / Corrosion of magnesium alloys in commercial engine coolants / Materials and Corrosion 56(1):15~23

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