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http://dx.doi.org/10.14773/cst.2018.17.1.30

Development of Hybrid Sol-Gel Coating to Prevent Corrosion of Magnesium Alloys  

Lee, Dong Uk (Department of Industrial Chemistry, Pukyong National University)
Kim, Young Hoon (Department of Industrial Chemistry, Pukyong National University)
Moon, Myung Jun (Department of Industrial Chemistry, Pukyong National University)
Publication Information
Corrosion Science and Technology / v.17, no.1, 2018 , pp. 30-36 More about this Journal
Abstract
The high rate of corrosion of magnesium alloys makes it limited for industrial applications. Therefore, surface treatment is required to enhance their corrosion resistance. In our study, a chemical conversion coating for protecting the corrosion of the magnesium alloy, AZ31B, was prepared by using a phosphate-permanganate solution. The chemical conversion coating had a limited protection ability due to defects arising from cracks and pores in the coating layer. The sol-gel coating was prepared by using trimethoxymethylsilane (MTMS) and 3-glycidoxypropyltrimethoxysilane (GPTMS) as precursors, and aluminum acetyl acetonate as a ring opening agent. The corrosion protection properties of sol-gel and conversion coatings in 0.35wt% NaCl solution were measured by the electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization test. The EIS results indicated that the resistance of the chemical conversion coating with the sol-gel coating was significantly improved through the sol-gel sealed phosphate-permanganate conversion coating. The results of the potentiodynamic polarization test revealed that the sol-gel coating decreased the corrosion current density ($I_{corr}$). The SEM image showed that the sol-gel coating sealed conversion coating and improved corrosion protection.
Keywords
conversion coating; sol-gel coating; corrosion protection; EIS; Potentiodynamic polarization test;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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