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http://dx.doi.org/10.5695/JKISE.2019.52.5.265

Effect of Na3PO4 Concentration on The Formation Behavior of PEO films on AZ31 Mg Alloy  

Moon, Sungmo (Surface Technology Division, Korea Institute of Materials Science)
Kim, Juseok (Surface Technology Division, Korea Institute of Materials Science)
Publication Information
Journal of the Korean institute of surface engineering / v.52, no.5, 2019 , pp. 265-274 More about this Journal
Abstract
Formation behavior of PEO (Plasma Electrolytic Oxidation) films on AZ31 Mg alloy was investigated under application of 310 Hz AC as a function of $Na_3PO_4$ concentration from 0.02 M to 0.2 M. Film formation voltage and in-situ observation of arcs generated on the specimen surface were recorded with time, and surface morphologies of the PEO films were investigated using optical microscopy, confocal scanning laser microscopy and scanning electron microscopy. PEO film formation voltage decreased linearly with increasing $Na_3PO_4$ concentration which is attributed to the increase of solution pH. PEO films were grown uniformly over the entire surface in $Na_3PO_4$ solutions between 0.05 M and 0.1 M. However, non-uniform PEO films with white spots were formed in $Na_3PO_4$ solutions containing more than 0.1 M. Thickness and roughness of PEO films on AZ31 Mg alloy increased linearly with increasing $Na_3PO_4$ concentration and their increasing rates appeared to be much higher under 1 M than above 1 M. The experimental results suggest that phosphate ions can contribute to the formation of PEO films but higher $Na_3PO_4$ concentration more than 1 M results in local damages of PEO films due to repeated generation of white arcs at the same surface site of AZ31 Mg alloy.
Keywords
$Na_3PO_4$ Concentration; PEO film; AZ31 Mg Alloy; Plasma Electrolytic Oxidation; Anodic oxide;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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1 Sungmo Moon, Cheolnam Yang, Sangjo Na, Effects of Hydroxide and Silicate ions on the Plasma Electrolytic Oxidation of AZ31 Mg Alloy, J. Kor. Inst. Surf. Eng. 47 (2014) 147-154.   DOI
2 S. Verdier, M. Boinet, S. Maximovitch, F. Dalard, Formation, structure and composition of anodic films on AM60 magnesium alloy obtained by DC plasma anodising, Corros. Sci. 47 (2005) 1429.   DOI
3 H. Duan, C. Yan, F. Wang, Effect of electrolyte additives on performance of plasma electrolytic oxidation films formed on magnesium alloy AZ91D, Electrochimica Acta. 52 (2007), 3785-3793.   DOI
4 R. Arrabal, E. Matykina, F. Viejo, P. Skeldon, G. E. Thompson, Corrosion resistance of WE43 and AZ91D magnesium alloys with phosphate PEO coatings, Corrosion Science 50 (2008) 1744-1752.   DOI
5 L. Chai, X. Yu, Z. Yang, Y. Wang, Masazumi Okido, Anodizing of magnesium alloy AZ31 in alkaline solutions with silicate under continuous sparking, Corros. Sci., 50 (2008) 3274.   DOI
6 A. Yabuki, M. Sakai, Anodic films formed on magnesium in organic, silicate-containing electrolytes, Corros. Sci. 51 (2009) 793.   DOI
7 J. Liang, P. B. Srinivasan, C. Blawert, M, Stormer, W. Dietzel, Electrochemical corrosion behaviour of plasma electrolytic oxidation coatings on AM50 magnesium alloy formed in silicate and phosphate based electrolytes, Electrochimica Acta. 54 (2009) 3842-3850.   DOI
8 S. Moon, Y. Nam, Anodic oxidation of Mg-Sn alloys in alkaline solutions, Corrosion Science 65 (2012) 494-501.   DOI
9 S. Yagi, A. Sengoku, K. Kubota, E. Matsubara, Surface modification of ACM522 magnesium alloy by plasma electrolytic oxidation in phosphate electrolyte, Corrosion Science. 57 (2012) 74-80.   DOI
10 T. S. Lim, H. S. Ryu, S. -H. Hong, Electrochemical corrosion properties of $CeO_2$-containing coatings on AZ31 magnesium alloys prepared by plasma electrolytic oxidation, Corros. Sci. 62 (2012) 104.   DOI
11 B. Kazanski, A. Kossenko, M. Zinigrad, A. Lugovskoy, Fluoride ions as modifiers of the oxide layer produced by plasma electrolytic oxidation on AZ91D magnesium alloy, Applied Surface Science 287 (2013) 461-466.   DOI
12 S. Moon, C. Yang, S. Na, Effects of Hydroxide and Silicate ions on the Plasma Electrolytic Oxidation of AZ31 Mg Alloy, Kor. Inst. Surf. Eng. 47(2014) 147-154.   DOI
13 S. Moon, A Blade-Abrading Method for Surface Pretreatment of Mg Alloys, Kor. Inst. Surf. Eng. 48 (2015) 194-198.   DOI
14 X. Lu, C. Blawert, M. L. Zheludkevich, K. U. Kainer, Insights into plasma electrolytic oxidation treatment with particle addition, Corrosion Science 101 (2015) 201-207.   DOI
15 X. Lu, C Blawert, Y. Huang, H Ovri, M. L. Zheludkevich, K. U. Kainer, Plasma electrolytic oxidation coatings on Mg alloy with addition of $SiO_2$ particles, Electrochimica Acta 187 (2016) 20-33.   DOI
16 S. Moon, R. Arrabal, E. Matykina, 3-Dimensional structures of open-pores in PEO films on AZ31 Mg alloy, Materials Letters 161 (2016) 439-441.   DOI
17 D. Kwon, S. Moon, Effects of NaOH Concentration on the Structure of PEO Films Formed on AZ31 Mg Alloy in $PO_4\;^{3-}$ and $SiO_3\;^{2-}$ Containing Aqueous Solution, Kor. Inst. Surf. Eng. 49 (2016) 46-53.   DOI
18 Sachiko Ono, Shuichi Moronuki, Yoichi Mori, Akihiko Koshi, Hidetaka Asoh, Effect of Electrolyte Concentration on the Structure and Corrosion Resistance of Anodic Films Formed on Magnesium through Plasma Electrolytic Oxidation, Electrochemica Acta, Volume 240, 20 June 2017, Pages 415-423.   DOI
19 Sungmo Moon, Duyoung Kwon, Anodic Oxide Films Formed on AZ31 Magnesium Alloy by Plasma Electrolytic Oxidation Method in Electrolytes Containing Various NaF Concentrations, Kor. Inst. Surf. Eng. 49 (2016) 225-230.   DOI