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초록· 키워드
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A chromium-free Ce-based conversion coating formed by immersion in a solution containing cerium chloride and nitric acid on AZ31 magnesium alloy has been studied. The effects of acid pickling on the morphology and the corrosion resistance of the cerium conversion coating were investigated. The corrosion resistance of the conversion coating prepared on AZ31 Mg alloy after organic acid pickling was better than that of inorganic acid pickling. The morphology of the conversion-coated layer was observed using optical microscope and SEM. Results show that the conversion coatings are relatively uniform and continuous, with thickness 1.0 to 1.1 μm. The main elements of the conversion coating of AZ31 Mg alloy are Mg, O, Al, Ce and Zn by EDS analysis. The electrochemical polarization results showed that the Ce-based conversion coating could reduce the corrosion activity of the AZ31 Mg alloy substrates in the presence of chloride ions.
목차
Abstract
1. 서론
2. 실험 방법
3. 실험 결과 및 고찰
4. 결론
References
참고문헌 (23)
참고문헌 신청
M. Avedesian, H. Baker, Magnesium and Magnesium Alloy, ASM Specialty Handbook 12 (1999).
G. L. Song, A. Atrens, Corrosion Mechanisms of Magnesium Alloys, Adv. Eng. Mater., 1 (1999) 11-33.
D. Peixoto Barbosa, G. Knörnschild, Anodization of Mg-Alloy AZ91 in NaOH Solutions, Surf. Coat. Tech., 203 (2009) 1629-1636.
Z. Liu, W. Gao. A Novel Process of Electroless Ni-P Plating with Plasma Electrolytic Oxidation Pretreatment, Appl. Surf. Sci. 253 (2006) 2988- 2991.
W. X. Zhang, Z. G. He, Z. H. Jiang, J. S. Lian, Electroless Ni–P Layer with a Chromium-Free Pretreatment on AZ91D Magnesium Alloy, Surf. Coat. Tech., 201 (2007) 4594-4600.
G. L. Song, A. Atrens, Corrosion Mechanisms of Magnesium Alloys, Adv. Eng. Mater., 1 (1999) 11-33.
D. Peixoto Barbosa, G. Knörnschild, Anodization of Mg-Alloy AZ91 in NaOH Solutions, Surf. Coat. Tech., 203 (2009) 1629-1636.
Z. Liu, W. Gao. A Novel Process of Electroless Ni-P Plating with Plasma Electrolytic Oxidation Pretreatment, Appl. Surf. Sci. 253 (2006) 2988- 2991.
W. X. Zhang, Z. G. He, Z. H. Jiang, J. S. Lian, Electroless Ni–P Layer with a Chromium-Free Pretreatment on AZ91D Magnesium Alloy, Surf. Coat. Tech., 201 (2007) 4594-4600.
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UCI(KEPA) : I410-ECN-0101-2016-581-002663484