Toward a nearly defect-free coating via high-energy plasma sparks

Abstract A nearly defect-free metal-oxide-based coating structure was made on Al-Mg-Si alloy by plasma electrolytic oxidation at high current density accompanying high-energy plasma sparks. The present coatings were performed at two different current densities of 50 and 125 mA/cm2 in the alkaline-ph...

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Autores principales:	Mosab Kaseem, Hae Woong Yang, Young Gun Ko
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/daa20a8804b2435bb70ec163fb28c560
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spelling	oai:doaj.org-article:daa20a8804b2435bb70ec163fb28c5602021-12-02T16:06:20ZToward a nearly defect-free coating via high-energy plasma sparks10.1038/s41598-017-02702-32045-2322https://doaj.org/article/daa20a8804b2435bb70ec163fb28c5602017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02702-3https://doaj.org/toc/2045-2322Abstract A nearly defect-free metal-oxide-based coating structure was made on Al-Mg-Si alloy by plasma electrolytic oxidation at high current density accompanying high-energy plasma sparks. The present coatings were performed at two different current densities of 50 and 125 mA/cm2 in the alkaline-phosphate-based electrolytes with different concentrations of sodium hexafluoroaluminate (Na3AlF6). The addition of (Na3AlF6) to the electrolyte used in this study would result in a decrease in the size of the micropore, and a reasonably defect-free coating structure was achieved in the sample treated at high current density of 125 mA/cm2. This was attributed mainly to the hydrolysis of AlF6 3− triggered by intense plasma sparks, which resulted in a uniform distribution of fluorine throughout the coating. Accordingly, the corrosion performance of the coating formed in the electrolyte containing 1.5 g/L Na3AlF6 at 125 mA/cm2 was improved significantly as confirmed by electrochemical impedance analysis. In addition, the formation mechanism of the nearly defect-free coating in the presence of Na3AlF6 was discussed.Mosab KaseemHae Woong YangYoung Gun KoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mosab Kaseem Hae Woong Yang Young Gun Ko Toward a nearly defect-free coating via high-energy plasma sparks
description	Abstract A nearly defect-free metal-oxide-based coating structure was made on Al-Mg-Si alloy by plasma electrolytic oxidation at high current density accompanying high-energy plasma sparks. The present coatings were performed at two different current densities of 50 and 125 mA/cm2 in the alkaline-phosphate-based electrolytes with different concentrations of sodium hexafluoroaluminate (Na3AlF6). The addition of (Na3AlF6) to the electrolyte used in this study would result in a decrease in the size of the micropore, and a reasonably defect-free coating structure was achieved in the sample treated at high current density of 125 mA/cm2. This was attributed mainly to the hydrolysis of AlF6 3− triggered by intense plasma sparks, which resulted in a uniform distribution of fluorine throughout the coating. Accordingly, the corrosion performance of the coating formed in the electrolyte containing 1.5 g/L Na3AlF6 at 125 mA/cm2 was improved significantly as confirmed by electrochemical impedance analysis. In addition, the formation mechanism of the nearly defect-free coating in the presence of Na3AlF6 was discussed.
format	article
author	Mosab Kaseem Hae Woong Yang Young Gun Ko
author_facet	Mosab Kaseem Hae Woong Yang Young Gun Ko
author_sort	Mosab Kaseem
title	Toward a nearly defect-free coating via high-energy plasma sparks
title_short	Toward a nearly defect-free coating via high-energy plasma sparks
title_full	Toward a nearly defect-free coating via high-energy plasma sparks
title_fullStr	Toward a nearly defect-free coating via high-energy plasma sparks
title_full_unstemmed	Toward a nearly defect-free coating via high-energy plasma sparks
title_sort	toward a nearly defect-free coating via high-energy plasma sparks
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/daa20a8804b2435bb70ec163fb28c560
work_keys_str_mv	AT mosabkaseem towardanearlydefectfreecoatingviahighenergyplasmasparks AT haewoongyang towardanearlydefectfreecoatingviahighenergyplasmasparks AT younggunko towardanearlydefectfreecoatingviahighenergyplasmasparks
_version_	1718385059345465344

Toward a nearly defect-free coating via high-energy plasma sparks

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