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. 2018 Jul 19;8:10925. doi: 10.1038/s41598-018-29299-5

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a) XRD patterns of the samples coated by plasma electrolytic oxidation (PEO), and samples coated by PEO process followed by DC with thiourea. Scan range, are from 20 to 90°; Cu Kα radiation source. (b) FT-IR spectra of the coated materials with and without thiourea. (c) Raman spectra of the (plasma electrolytic oxidation) PEO coatings and PEO coatings followed by dip-coating (DC) with thiourea. (d) Full XPS spectra of the PEO coatings and PEO coatings followed by DC with thiourea. Normalized, high-resolution XPS scan of (e) Mg and (f) Al for PEO coating alone and PEO-DC coating, respectively.