The Effect of Electrolytic Solution Composition on the Structure, Corrosion, and Wear Resistance of PEO Coatings on AZ31 Magnesium Alloy
Source abstract
Abstract
Plasma electrolytic oxidation coatings were prepared in aluminate, phosphate, and silicate-based electrolytic solutions using a soft-sparking regime in a multi-frequency stepped process to compare the structure, corrosion, and wear characteristics of the obtained coatings on AZ31 magnesium alloy. The XRD results indicated that all coatings consist of MgO and MgF2, while specific products such as Mg2SiO4, MgSiO3, Mg2P2O7, and MgAl2O4 were also present in specimens based on the selected solution. Surface morphology of the obtained coatings was strongly affected by the electrolyte composition. Aluminate-containing coating showed volcano-like, nodular particles and craters distributed over the surface. Phosphate-containing coating presented a sintering-crater structure, with non-uniform distributions of micro-pores and micro-cracks. Silicate-containing coating exhibited a scaffold surface involving a network of numerous micro-pores and oxide granules. The aluminate-treated sample offered the highest corrosion resistance and the minimum wear rate (5 × 10−5 mm3 N−1 m−1), owing to its compact structure containing solely 1.75% relative porosity, which is the lowest value in comparison with other samples. The silicate-treated sample was degraded faster in long-term corrosion and wear tests due to its porous structure, and with more delay in the phosphate-containing coating due to its larger thickness (30 µm).
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Research context
OpenAlex topics: Magnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · Corrosion Behavior and Inhibition
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
Yekta Mobaddel Pars Co., Science and Technology Campus, Yazd University, Yazd 89158-18411, Iran
Dipartimento di Ingegneria, Universita di Palermo, Viale delle Scienze, Ed. 6, 90128 Palermo, Italy
References (52)
Show source-provided references
1. Magnesium properties—Applications—Potential10.1016/S0921-5093(00)01351-4 ↗
2. Novel Magnesium Alloys Developed for Biomedical Application: A Review10.1016/j.jmst.2013.02.005 ↗
3. Effect of microstructure evolution on corrosion of different crystal surfaces of AZ31 Mg alloy in a chloride containing solution10.1016/j.corsci.2011.09.005 ↗
4. General and localized corrosion of magnesium alloys: A critical review10.1361/10599490417533 ↗
5. Fundamentals and advances in magnesium alloy corrosion10.1016/j.pmatsci.2017.04.011 ↗
6. Investigation of wear properties of magnesium and aluminum alloys for automotive applications10.1016/j.jmatprotec.2004.04.247 ↗
7. A review of recent work on discharge characteristics during plasma electrolytic oxidation of various metals10.1080/09506608.2018.1466492 ↗
8. Hryniewicz, T. (2018). Plasma electrolytic oxidation of metals and alloys. Metals, 8.10.3390/met8121058 ↗
9. Plasma electrolysis for surface engineering10.1016/S0257-8972(99)00441-7 ↗
10. Systematic study of the electrolytic plasma oxidation process on a Mg alloy for corrosion protection10.1016/j.tsf.2005.08.156 ↗
11. Tsai, D., and Chou, C. (2018). Review of the Soft Sparking Issues in Plasma Electrolytic Oxidation. Metals, 8.10.3390/met8020105 ↗
12. Porosity in plasma electrolytic oxide coatings10.1016/j.actamat.2005.12.029 ↗
13. Plasma electrolytic oxidation of magnesium and its alloys: Mechanism, properties and applications10.1016/j.jma.2017.02.004 ↗
14. Influence of pulse parameters on the microstructure of ceramic oxide coatings produced on al alloy by pulsed dc plasma electrolytic oxidation10.1166/nnl.2016.2100 ↗
15. Structure and corrosion resistance of peo ceramic coatings on az91d mg alloy under three kinds of power modes10.1111/j.1744-7402.2012.02833.x ↗
16. Effect of cathodic micro-discharges on oxide growth during plasma electrolytic oxidation (PEO)10.1016/j.surfcoat.2015.01.076 ↗
17. Effect of PEO-modes on the electrochemical and mechanical properties of coatings on MA8 magnesium alloy10.1016/j.phpro.2012.01.023 ↗
18. Effects of current frequency on the structural characteristics and corrosion property of ceramic coatings formed on magnesium alloy by PEO technology10.1016/j.jmatprotec.2007.12.125 ↗
19. Effect of pulse frequency on the microstructure, phase composition and corrosion performance of a phosphate-based plasma electrolytic oxidation coated AM50 magnesium alloy10.1016/j.apsusc.2010.01.052 ↗
20. The preparation and corrosion behaviors of MAO coating on AZ91D with rare earth conversion precursor film10.1016/j.apsusc.2010.11.153 ↗
21. Interaction effect between different constituents in silicate-containing electrolyte on PEO coatings on Mg alloy10.1016/j.surfcoat.2016.09.031 ↗
22. Influence of Phosphate Concentration on Plasma Electrolytic Oxidation of AZ80 Magnesium Alloy in Alkaline Aluminate Solution10.2320/matertrans.M2009226 ↗
23. Characterization and mechanical properties of coatings on magnesium by micro arc oxidation10.1016/j.apsusc.2012.08.099 ↗
24. Characterization and corrosion behavior of ceramic coating on magnesium by micro-arc oxidation10.1016/j.jallcom.2011.06.059 ↗
25. Comparison of coating properties obtained by MAO on magnesium alloys in silicate and phytic acid electrolytes10.1016/j.cap.2009.06.008 ↗
26. Biodegradation behavior of micro-arc oxidized AZ31 magnesium alloys formed in two different electrolytes10.1016/j.apsusc.2012.07.105 ↗
27. Corrosion and wear properties of PEO coatings formed on AM60B alloy in NaAlO2 electrolytes10.1016/j.apsusc.2011.05.115 ↗
28. Tribological behaviour of plasma electrolytic oxide coatings on Ti6Al4V and cp-Ti alloys10.1179/1743294415Y.0000000075 ↗
29. Synergistic effect of W incorporation and pulsed current mode on wear and tribocorrosion resistance of coatings grown by plasma electrolytic oxidation on 7075 Al alloy10.1088/2053-1591/ab3630 ↗
30. Rahmati, M., Raeissi, K., Toroghinejad, M.R., and Hakimizad, A. (2019). Effect of Pulse Current Mode on Microstructure, Composition and Corrosion Performance of the Coatings Produced by Plasma Electrolytic Oxidation. Coatings, 9.10.3390/coatings9100688 ↗
31. Dong, H., Blawert, C., and Srinivasan, P.B. (2010). Plasma electrolytic oxidation treatment of magnesium alloys. Surface Engineering of Light Alloys, Woodhead Publishing.10.1533/9781845699451.2.155 ↗
32. Development of corrosion and wear resistant micro-arc oxidation coating on a magnesium alloy10.1016/j.surfcoat.2018.10.089 ↗
33. Lu, X., Chen, Y., Blawert, C., Li, Y., Zhang, T., Wang, F., Kainer, K.U., and Zheludkevich, M. (2018). Influence of SiO2 particles on the corrosion and wear resistance of plasma electrolytic oxidation-coated AM50 Mg alloy. Coatings, 8.10.3390/coatings8090306 ↗
34. Growth behaviour of low-energy plasma electrolytic oxidation coatings on a magnesium alloy10.1016/j.jma.2018.05.008 ↗
35. Spectroscopic study of electrolytic plasma and discharging behaviour during the plasma electrolytic oxidation (PEO) process10.1088/0022-3727/43/10/105203 ↗
36. Using a synthetic body fluid (SBF) solution of 27 mM HCO3− to make bone substitutes more osteointegrative10.1016/j.msec.2007.10.058 ↗
37. Growth process of plasma electrolytic oxidation films formed on magnesium alloy AZ91D in silicate solution10.1016/j.electacta.2007.02.021 ↗
38. New findings on properties of plasma electrolytic oxidation coatings from study of an Al–Cu–Li alloy10.1016/j.electacta.2013.06.022 ↗
39. Investigation of electrode distance impact on PEO coating formation assisted by simulation10.1016/j.apsusc.2016.01.030 ↗
40. Characteristics and corrosion resistance of plasma electrolytic oxidation coatings on AZ31B Mg alloy formed in phosphate—Silicate mixture electrolytes10.1016/j.corsci.2014.07.038 ↗
41. Investigation of tribological properties of micro-arc oxidation ceramic coating on Mg alloy under dry sliding condition10.1016/j.ceramint.2018.05.137 ↗
42. Effect of fluoride ions modifier and ceramic Al2O3 particles additives on plasma electrolytic oxidation of AZ3110.1080/02670844.2016.1214407 ↗
43. The formation of metallic W and amorphous phase in the plasma electrolytic oxidation coatings on an Al alloy from tungstate-containing electrolyte10.1016/j.surfcoat.2019.01.024 ↗
44. Microstructural characteristics of PEO coating: Effect of surface nanocrystallization10.1016/j.jallcom.2020.153823 ↗
45. Preparation and corrosion performance of PEO coating with low porosity on magnesium alloy AZ91D in acidic KF system10.1016/S1452-3981(23)18402-1 ↗
46. Fast migration of fluoride ions in growing anodic titanium oxide10.1016/j.elecom.2006.12.023 ↗
47. Corrosion resistance and microstructure characteristics of plasma electrolytic oxidation coatings formed on AZ31 magnesium alloy10.1179/026708410X12506873242822 ↗
48. A mathematical description accounting for the superfluous hydrogen evolution and the inductive behaviour observed during electrochemical measurements on magnesium10.1016/j.electacta.2018.04.116 ↗
49. Corrosion and erosion properties of silicate and phosphate coatings on magnesium10.1016/j.tsf.2004.06.168 ↗
50. Influence of graphene oxide additive on the tribological and electrochemical corrosion properties of a PEO coating prepared on AZ31 magnesium alloy10.1016/j.triboint.2019.106135 ↗
51. Plasma electrolytic oxidation coatings on AZ31 magnesium alloys with Si 3 N 4 nanoparticle additives10.1016/j.surfcoat.2017.05.094 ↗
52. The influence of various additives on the properties of PEO coatings formed on AZ31 Mg Alloy10.1142/S0218625X16500062 ↗