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Open AccessArticle

Electrodeposition of a Pd-Ni/TiO2 Composite Coating on 316L SS and Its Corrosion Behavior in Hot Sulfuric Acid Solution

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School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
2
School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, China
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MATEIS UMR CNRS 5510, Universitéde Lyon, INSA-Lyon, Bat L. de Vinci, 21 Avenue Jean Capelle, 69621 Villeurbanne CEDEX, France
4
School of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
*
Authors to whom correspondence should be addressed.
Coatings 2018, 8(5), 182; https://doi.org/10.3390/coatings8050182
Received: 2 April 2018 / Revised: 27 April 2018 / Accepted: 3 May 2018 / Published: 11 May 2018
(This article belongs to the Special Issue Advanced Coatings for Corrosion Protection in Extreme Environments)
Pd-Ni/TiO2 composite coatings were elaborated on 316L stainless steel by an electrodeposition method. The specimens were obtained from an electrolytic bath that contained various contents (5, 10, and 15 g L−1) of nanosized TiO2 particles. X-ray diffraction (XRD) characterization showed that increasing the TiO2 content in the coatings can decrease the crystal grain size. The surface morphology and chemical composition of the composite coatings were modified by the addition of TiO2 particles in the electrolyte, as shown by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) methods, respectively. The TiO2 content also significantly affected the mechanical and electrochemical properties of the Pd-Ni/TiO2 composite coatings. The microhardness of the Pd-Ni/TiO2 composite coatings can be enhanced by increasing the TiO2 content in the coatings. With the addition of 5 g L−1 TiO2 particles to the electrolyte, the deposited Pd-Ni/TiO2 composite coating presented a remarkably increased corrosion resistance when exposed to a sulfuric acid solution at 60 °C compared with that of the Pd-Ni alloy coating. Nevertheless, the further addition of TiO2 particles into the electrolytic bath did not further improve the corrosion resistance of the composite coating. View Full-Text
Keywords: Pd-Ni/TiO2; electrodeposition; composite coating; corrosion Pd-Ni/TiO2; electrodeposition; composite coating; corrosion
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Zhang, Z.; Tang, J.; Wang, Y.; Wang, H.; Normand, B.; Zuo, Y. Electrodeposition of a Pd-Ni/TiO2 Composite Coating on 316L SS and Its Corrosion Behavior in Hot Sulfuric Acid Solution. Coatings 2018, 8, 182.

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Coatings, EISSN 2079-6412, Published by MDPI AG
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