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Characterization of hydroxyapatite layer on AISI 316L stainless steel.

Hlinka, Josef; Lasek, Stanislav; Siostrzonek, René; Faisal, Nadimul

Authors

Josef Hlinka

Stanislav Lasek

René Siostrzonek



Abstract

Bioactive coatings can be divided into two main groups - organic and inorganic coatings. Hydroxyapatite (HA) is well known as one of inorganic part of mammal's bone structure and is highly recommended for use in implantology. This paper is mainly focused on characterization of hydroxyapatite particles electrochemically deposited from water solution of Ca(NO3)2 and NH4H2PO4 on surface of AISI 316L (1.4404) stainless steel with different roughness profiles and surface treatment. The effect of surface roughness itself is discussed as well as heat treatment (400 {deg}C) of samples after coating deposition. Electrodeposition of HA was carried out at cycling of potential values of -2.0 V for 2 s and 0 V (NHE) for 1 s; 200 cycles was used for this study. Electrochemical properties of such treated samples were characterized using voltammetry and EIS methods. It was found, that time of deposition significantly changes electrochemical parameters of equivalent el. circuit used for closer characterization of coating properties but only marginally affects corrosion properties like open circuit potential (OCP), corrosion potential (Ecorr) or potential of passive layer breakdown (Ebreak). Pull-off test also proved significant correlation between surface roughness, heat treatment and adhesion of deposited coatings.

Start Date May 24, 2017
Publication Date May 26, 2017
Publisher New Publisher Required
Pages 1292-1297
Institution Citation HLINKA, J., LASEK, S., SIOSTRZONEK, R. and FAISAL, N. 2017. Characterization of hydroxyapatite layer on AISI 316L stainless steel. In Proceedings of the 26th International conference on metallurgy and materials (METAL 2017), 24-26 May 2017, Brno, Czech Republic. Ostrava: Tanger, pages 1292-1297.
Keywords Biomaterials; Corrosion resistance; Electrochemical treatment; Hydroxyapatite; Implants

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