Browse > Article
http://dx.doi.org/10.5695/JKISE.2020.53.6.351

Effect of Na3PO4 Concentration on the Formation Behavior and Properties of PEO Films on AA2024  

Kim, Juseok (Surface Materials Division, Korea Institute of Materials Science)
Shin, Heon-cheol (Department of Materials Science and Engineering, Pusan National University)
Moon, Sungmo (Surface Materials Division, Korea Institute of Materials Science)
Publication Information
Journal of the Korean institute of surface engineering / v.53, no.6, 2020 , pp. 351-359 More about this Journal
Abstract
Formation behavior and properties of PEO (Plasma Electrolytic Oxidation) film on AA2024 were investigated under application of pulsed current as a function of Na3PO4 concentration in 0.05 M Na2SiO3 solution by analyzing voltage-time behavior, in-situ observation of arc generation, observation of surface morphology and measurements of thickness and surface roughness. Arc generation voltage decreased with increasing Na3PO4 concentration. Color difference of PEO films between edge and inner part disappeared by addition of Na3PO4. It was also observed that size of nodules on PEO film decreased with increasing Na3PO4 concentration. Thickness of PEO films formed on AA2024 increased with increasing Na3PO4 concentration. Whereas, surface roughness of PEO films decreased with increasing Na3PO4 concentration up to 0.05 M of Na3PO4 which is attributed to the deceased size of nodules on the PEO films. However, the surface roughness increased with increasing Na3PO4 concentration more than 0.07 M of Na3PO4 which seems to be due to the formation of non-uniform PEO films with smooth surface and large size pores formed by orange-colored big arcs. The experimental results suggest that added sodium phosphate less than 0.2 M in an alkaline silicate solution can contribute to the formation of relatively thick and uniform thickness of PEO films under arc generation voltage lower than 300 V.
Keywords
Plasma electrolytic oxidation; Phosphate concentration; AA2024; Anodic oxide;
Citations & Related Records
Times Cited By KSCI : 13  (Citation Analysis)
연도 인용수 순위
1 F. C. Walsh, C. T. J. Low, R. J. K. Wood, K. T. Stevens, J. Archer, A. R. Poeton & A. Ryder, Plasma electrolytic oxidation (PEO) for production of anodised coatings on lightweight metal (Al, Mg, Ti) alloys, Transactions of the IMF, 87:3 (2009) 122-135.   DOI
2 T. W. Clyne, S. C. Troughton, A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals, International Materials Reviews, 64:3 (2019) 127-162.   DOI
3 S. Moon and Y. Kim, Lateral Growth of PEO Films on Al1050 Alloy in an Alkaline Electrolyte, J. Kor. Inst. Surf. Eng. 50 (2017) 10-16.   DOI
4 S. Moon, Y. Nam, Anodic oxidation of Mg-Sn alloys in alkaline solutions, Corrosion Science 65 (2012) 494-501.   DOI
5 D. Kwon, S. Moon, Effects of NaOH Concentration on the Structure of PEO Films Formed on AZ31 Mg Alloy in PO43- and SiO32- Containing Aqueous Solution, Kor. Inst. Surf. Eng. 49 (2016) 46-53.   DOI
6 S. Moon, Y. Kim, PEO film formation behavior of Al1050 alloy under direct current in an alkaline electrolyte, J. Korean Inst. Suf. Eng., 50 (2017) 17-23.   DOI
7 S. Moon, Y. Jeong, Generation mechanism of microdischarges during plasma electrolytic oxidation of Al in aqueous solutions, Corrosion Science 51 (2009) 1506-1512.   DOI
8 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
9 W. Liu, C. Blawert, Mikhail-L. Zheludkevich, C. Fan, M. Talha, Y. Lin, Microstructure, wear and corrosion performance of plasma electrolytic oxidation coatings formed on D16T Al alloy, Rare Met. 39(2020) 1425-1439.   DOI
10 J. Lee, K. Jung, S. Kim, Characterization of ceramic oxide coatings prepared by plasma electrolytic oxidation using pulsed direct current with different duty ratio and frequency, Applied Surface Science, 516 (2020) 146049.   DOI
11 Fattah-alhosseini, A., Gashti, S.O. & Molaie, M. Effects of Disodium Phosphate Concentration (Na2HPO4·2H2O) on Microstructure and Corrosion Resistance of Plasma Electrolytic Oxidation (PEO) Coatings on 2024 Al Alloy, J. of Materi Eng and Perform 27 (2018) 825-834.   DOI
12 A. V. Kolomeichenko, I. N. Kravchenko, Elemental Composition and Microhardness of the Coatings Prepared on Faced Aluminum Alloys by Plasma Electrolytic Oxidation in a Silicate-Alkaline Electrolyte, Russian Metallurgy (Metally), 13 ( 2019) 1410-1413.   DOI
13 H. XIE, Y. CHENG, S. LI, J. CAO, L CAO, Wear and corrosion resistant coatings on surface of cast A356 aluminum alloy by plasma electrolytic oxidation in moderately concentrated aluminate electrolytes, Trans. Nonferrous Met. Soc. China 27(2017) 336-351.   DOI
14 Ding, ZY., Wang, YH., Ouyang, JH. et al. Insights into structure and high-temperature oxidation behavior of plasma electrolytic oxidation ceramic coatings formed in NaAlO2-Na2CrO4 electrolyte. J Mater Sci 53 (2018) 9978-9987.   DOI
15 E. Matykina, R. Arrabal, M. Mohedano, B. Mingo, J. Gonzalez, A. Pardo, M.C. Merino, Recent advances in energy efficient PEO processing of aluminium alloys, Trans. Nonferrous Met. Soc. China 27 (2017) 1439-1454.   DOI
16 S. Moon and J. Kim, Effect of Na3PO4 Concentration on The Formation Behavior of PEO films on AZ31 Mg Alloy, J. Kor. Inst. Surf. Eng. 52 (2019) 265-274.   DOI
17 G. Lv, W. Gu, H. Chen, W. Feng, M. L. Khosa, L. Li, E. Niu, G. Zhang, S. Yang, Characteristic of ceramic coatings on aluminum by plasma electrolytic oxidation in silicate and phosphate electrolyte, Appl. Surf. Sci. 253 (2006) 2947-2952.   DOI
18 E. Song, Y. Kim, J. Choi, Effects of Na3PO4 Concentration on the Porosity of Plasma Electrolytic Oxidation Coatings Surface on the 6061 Al Alloy, and Subsequent-NaAlO2 Sealing, J. Kor. Inst. Surf. Eng. 52 (2019) 117-122.   DOI
19 S. Moon, Anodic Oxidation Treatment Methods of Metals, Kor. Inst. Surf. Eng., 51 (2018), 1-10.
20 A. L. Yerokhin, X. Nie, A. Leyland, A. Matthews, and S. J. Dowey, Plasma electrolysis for surface engineering, Surface and Coatings Technology., 122 (1999) 73.   DOI