Characterization of hydroxyapatite layer on AISI 316L stainless steel.

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.

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.

• Conference Name: 26th International conference on metallurgy and materials (METAL 2017)
• Conference Location: Brno, Czech Republic
• Start Date: May 24, 2017
• End Date: May 26, 2017
• Acceptance Date: Apr 30, 2017
• Online Publication Date: May 24, 2017
• Publication Date: May 26, 2017
• Deposit Date: Mar 30, 2018
• Publicly Available Date: Mar 30, 2018
• Publisher: Tanger Ltd.
• Pages: 1292-1297
• Keywords: Biomaterials; Corrosion resistance; Electrochemical treatment; Hydroxyapatite; Implants
• Public URL: http://hdl.handle.net/10059/2839