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. 2017 Jun 30;7:4403. doi: 10.1038/s41598-017-04651-3

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© The Author(s) 2017

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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Potentiodynamic polarization curves of (a) uncoated, PDDA/PSC and PSC/TMS-SiO₂ coating with their respective CA images as inset. (b) Nyquist plot of uncoated and coated samples, equivalent circuits used to fit the EIS diagrams of (b1) uncoated and (b2) coated samples. (c) Bode impedance and (d) phase plot of uncoated and coated samples.