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Volume 13
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10.3390/ma13030499
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Discussion

Effect of K2ZrF6 Concentration on the Two-Step PEO Coating Prepared on AZ91 Mg Alloy in Alkaline Silicate Solution

by
Zeeshan Ur Rehman
1,
Bon Heun Koo
2,*,
Yeon-Gil Jung
2,
Je Hyun Lee
2 and
Dongjin Choi
1,*
1
School of Materials Science and Engineering, Hongik University, Sejong-si 30016, Korea
2
School of Material Science and Engineering, Changwon National University, Changwon 642968, Korea
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(3), 499; https://doi.org/10.3390/ma13030499
Submission received: 4 October 2019 / Revised: 1 January 2020 / Accepted: 8 January 2020 / Published: 21 January 2020
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Abstract

In this study, a two-step Plasma Electrolytic Oxidation (PEO) method with constant primary step parameters and varying K2ZrF6 concentration in the secondary electrolyte solution was carried out to obtain a hard and dense coating on AZ91D alloy. For lower concentrations of K2ZrF6, a mixture of granular and pancake structure with higher surface porosity was obtained. Increasing the concentration up to 6 g/L caused the granular structure to disappear and a significant decrease was observed in the surface porosity as well as inner layer damage. Due to the compact inner layer structure, significant improvement in the corrosion resistance and mechanical properties of the AZ91 was observed with K2ZrF6 concentration. Highest values of hardness and corrosion resistance, i.e., 1589.45 HV and 386.30 × 103 Ω cm2, respectively, were obtained for a 6 g/L K2ZrF6 concentration.
Keywords: PEO; magnesium; K2ZrF6; corrosion; hardness; two-step PEO; magnesium; K2ZrF6; corrosion; hardness; two-step

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MDPI and ACS Style

Ur Rehman, Z.; Heun Koo, B.; Jung, Y.-G.; Lee, J.H.; Choi, D. Effect of K2ZrF6 Concentration on the Two-Step PEO Coating Prepared on AZ91 Mg Alloy in Alkaline Silicate Solution. Materials 2020, 13, 499. https://doi.org/10.3390/ma13030499

AMA Style

Ur Rehman Z, Heun Koo B, Jung Y-G, Lee JH, Choi D. Effect of K2ZrF6 Concentration on the Two-Step PEO Coating Prepared on AZ91 Mg Alloy in Alkaline Silicate Solution. Materials. 2020; 13(3):499. https://doi.org/10.3390/ma13030499

Chicago/Turabian Style

Ur Rehman, Zeeshan, Bon Heun Koo, Yeon-Gil Jung, Je Hyun Lee, and Dongjin Choi. 2020. "Effect of K2ZrF6 Concentration on the Two-Step PEO Coating Prepared on AZ91 Mg Alloy in Alkaline Silicate Solution" Materials 13, no. 3: 499. https://doi.org/10.3390/ma13030499

APA Style

Ur Rehman, Z., Heun Koo, B., Jung, Y.-G., Lee, J. H., & Choi, D. (2020). Effect of K2ZrF6 Concentration on the Two-Step PEO Coating Prepared on AZ91 Mg Alloy in Alkaline Silicate Solution. Materials, 13(3), 499. https://doi.org/10.3390/ma13030499

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