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Effect of NaOH Concentration on the Microstructure and Mechanical Properties of the PEO Coatings on Mg-Al3-Zn1 Alloy

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Abstract:

In this work, the effect of NaOH concentration on the properties of PEO coatings formed on AZ31B Mg alloy is studied. Composition and structure analysis of coatings were carried out by XRD and SEM. From the results, it was found that the number of pores, defects and width of the discharge traces are highly dependent on NaOH concentration. Major phases of the coating identified from XRD were consisted of MgO and Mg2SiO4. The crystallinity of the coatings and magnitude of MgO phase was highly incremented with NaOH concentration. From the Vickers hardness test it was observed that hardness of the coatings prepared in 2g/l of NaOH have the highest values~1050HV, with peak wear resistance values.

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Periodical:

Materials Science Forum (Volume 977)

Pages:

83-89

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.977.83

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Online since:

February 2020

Authors:

Zeeshan Ur Rehman, Chanyoung Jeong, Dong Jin Choi*

Keywords:

Mechanical Properties, Mg Alloy, PEO Coating, SEM, XRD

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References

[1] J.E. Gray, B. Luan, Protective coatings on magnesium and its alloys — a critical review. J. Alloys Compd. 336 (2002) 88-113.

DOI: 10.1016/s0925-8388(01)01899-0

Google Scholar

[2] Z.U. Rehman, Y. S. Jeong, B.H. Koo, Effect of Processing Time on the Microarc Oxidation Coatings Produced on Magnesium AZ61 Alloy at Constant Hybrid Voltage. Korean Journal of Materials Research. 25 (2015) 509-515.

DOI: 10.3740/mrsk.2015.25.10.509

Google Scholar

[3] Z.U. Rehman, B.H. Koo, Combined effect of long processing time and Na2SiF6 on the properties of PEO coatings formed on AZ91D, J. Mater. Eng. Perform. 25 (2016)3531–3537.

DOI: 10.1007/s11665-016-2177-2

Google Scholar

[4] Z.U. Rehman, S. H. Shin, I. Hussain, B. H. Koo, Structure and corrosion properties of the two-step PEO coatings formed on AZ91D Mg alloy in K2ZrF6-based electrolyte solution, Surf. Coat. Technol. 307 (2016) 484-490.

DOI: 10.1016/j.surfcoat.2016.09.030

Google Scholar

[5] G. Song, A. Atrens, Understanding Magnesium Corrosion—A Framework for Improved Alloy Performance. Advanced Engineering Materials. 5 (2003) 249-273.

DOI: 10.1002/adem.200310405

Google Scholar

[6] Wang Li, Wen Fu, Shiqin Wang, Jian Li, Plasma electrolytic oxidation coatings in KOH electrolyte and its discharge characteristics. J. Alloys Compd. 594 (2014) 27-31.

DOI: 10.1016/j.jallcom.2014.01.109

Google Scholar

[7] R. Arrabal, E. Matykina, T. Hashimot, P. Skeldon, and G.E. Thompson, Characterization of AC PEO Coatings on Magnesium Alloys, Surf. Coat. Technol. 203 (2009) 2207–2220.

DOI: 10.1016/j.surfcoat.2009.02.011

Google Scholar

[8] Young Gun Ko , Seung Namgung , Dong Hyuk Shin, Correlation between KOH concentration and surface properties of AZ91 magnesium alloy coated by plasma electrolytic oxidation. Surf. Coat. Technol. 205 2010, 2525-2531.

DOI: 10.1016/j.surfcoat.2010.09.055

Google Scholar

[9] L.O. Snizhko, A.L. Yerokhin, A. Pilkington, N.L. Gurevina, D.O. Misnyankin, A. Leyland, and A. Matthews, Anodic Processes in Plasma Electrolytic Oxidation of Aluminum in Alkaline Solutions. Electrochim. Acta. 49 (2004) pp.2085-2095.

DOI: 10.1016/j.electacta.2003.11.027

Google Scholar

[10] D. Salehi Doolabi, M. Ehteshamzadeh, and S.M.M. Mirhosseini, Effect of NaOH on the Structure and Corrosion Performance of Alumina and Silica PEO Coatings on Aluminum. JMEPEG. 21 (2012) 2195-2202.

DOI: 10.1007/s11665-012-0151-1

Google Scholar

[11] I. Han, J.H. Choi, B.H. Zhao, H.K. Baik, I. Lee, Micro-arc oxidation in various concentration of KOH and structural change by different cut off potential. Curr. Appl. Phys. 7S1 (2007) e23-e27.

DOI: 10.1016/j.cap.2006.11.008

Google Scholar

[12] Zeeshan Ur Rehman, Dong-Gun Lee, Bon Heun Koo. Effect of OH− Concentration on the Mechanical and Microstructural Properties of Microarc Oxidatoin Coating Produced on Al7075 Alloy. Korean Journal of Materials Research. 25 (2015) 503-508.

DOI: 10.3740/mrsk.2015.25.10.503

Google Scholar

[13] L.O. Snizhko, A.L. Yerokhin, N.L. Gurevina, V.A. Patalakha, A. Matthews; Excessive oxygen evolution during plasma electrolytic oxidation of aluminium, Thin Solid Films 516 (2007) 460–464.

DOI: 10.1016/j.tsf.2007.06.158

Google Scholar

[14] J.R. Morlidge, P. Skeldon, G.E. Thompson, H. Habazaki, K. Shimizu, G.C. Wood, Gel formation and the efficiency of anodic growth on Aluminium, Electrochim. Acta 44 (1999) 2423.

DOI: 10.1016/s0013-4686(98)00363-6

Google Scholar

[15] Hongfei Guo, Maozhong An, Shen Xu, Huibin Huo; Formation of oxygen bubbles and its influence on current efficiency in micro-arc oxidation process of AZ91D magnesium alloy, Thin Solid Films 485 (2005) 53–58.

DOI: 10.1016/j.tsf.2005.03.050

Google Scholar

[16] J.A. Williams, Wear modelling: analytical, computational and mapping: a continuum mechanics approach, Wear, 1, (1999) Part 1, 225–229.

DOI: 10.1016/s0043-1648(99)00060-5

Google Scholar

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