Electrophoretic Deposition of Nanocomposite Hydroxyapatite/Titania Coating on 2205 Duplex Stainless Steel Substrate
- PDF / 2,131,480 Bytes
- 10 Pages / 593.972 x 792 pts Page_size
- 86 Downloads / 208 Views
https://doi.org/10.1007/s11837-020-04437-5 Ó 2020 The Minerals, Metals & Materials Society
ADVANCED COATING AND THIN FILM MATERIALS FOR ENERGY, AEROSPACE AND BIOLOGICAL APPLICATIONS
Electrophoretic Deposition of Nanocomposite Hydroxyapatite/ Titania Coating on 2205 Duplex Stainless Steel Substrate ALI SABEA HAMMOOD ,1,2 MAHMOOD SHAKIR NASER,1,3 and ZAINAB SHAKIR RADEEF1,4 1.—Department of Materials Engineering, Faculty of Engineering, University of Kufa, Najaf, Iraq. 2.—e-mail: [email protected]. 3.—e-mail: [email protected]. 4.—e-mail: [email protected]
This paper reports on electrophoretic deposition (EPD) of hydroxyapatite/titania nanocomposite coatings on 2205 duplex stainless steel (DSS). A homogeneous thin coating was obtained using the EPD process at a potential of 30 V for 1 min. The microstructure of the coated substrate was studied by optical microscopy, atomic force microscopy (AFM), and scanning electron microscopy (SEM). The formed phases of the primary materials were analyzed by x-ray diffraction (XRD). The effects of using deposition voltages of 20 V, 30 V, and 40 V on the kinetics during EPD were identified. The corrosion behavior of coated and uncoated samples was studied in Ringer’s solution using potentiodynamic and cyclic polarization tests. A homogeneous morphology and crack-free structure were obtained at the optimum condition of 30 V, with minimum porosity and the highest corrosion resistance. The current results confirm that these materials offer excellent corrosion resistance with stability, being suitability for use in medical applications as a substrate coated with a biocomposite hydroxyapatite/titania layer.
INTRODUCTION Duplex stainless steels (DSS) contain approximately equal amounts of ferrite (a) and austenite (c) phases in their microstructure,1 resulting in a useful combination of mechanical properties such as strength, ductility, and corrosion resistance.2,3 The stress corrosion cracking (SCC) and yield strength of austenitic stainless steels exhibit an increase in the presence of the ferrite phase, while the presence of the austenite phase might improve the ferritic stainless steel’s toughness.4 The lower nickel content of DSS as compared with austenitic stainless steel makes it a better biomaterial by eliminating or minimizing the harmful effect of the allergic reaction when Ni is released, thus DSS are considered as alternative materials to austenitic stainless steel for use in the medical field. Nickel hypersensitivity and content represent problematic issue in the medical treatment field, and mitigation of such problems will be helpful in many fields.5–8
(Received April 8, 2020; accepted October 5, 2020)
More than 90% of implants fail due to low crevice and pitting corrosion resistance of 316L stainless steel in the human body.9 However, direct contact between metal and body fluid can be minimized by coating the metallic substrate with a bioceramic material such as hydroxyapatite (HAp) Ca10(PO4)6(OH)2 to reduce the release of toxic m
Data Loading...
