Anodic Oxidation of Titanium in Sulphuric Acid and Phosphoric Acid Electrolytes

• DOI: 10.15744/2348-9812.1.s106
• Publication Date: 2014-09-21T13:02:05Z
• Authors: Uttiya S; Contarino D; Prandi S; Carnasciali MM; Gemme G; Mattera L; Rolandi R; Canepa M; Cavalleri O
• Keywords: 02 engineering and technology; 0210 nano-technology

Introduction Anodisation of pure titanium has been carried out in sulphuric and in phosphoric acid solutions at potentials ranging from 50 to 150V. The SEM and AFM morphological analysis indicates that, within this potential range, oxidation in sulphuric acid solution produces better developed mesoporous oxide layers. XPS analysis of the Ti2p core level region and Raman spectroscopy measurements show that oxide layers grown in sulphuric acid are characterised by a better defined oxidation state of titanium and by a higher content in anatase crystalline phase. XPS measurements indicate that oxidation in phosphoric acid solution produces oxide layers with two components of stoichiometric oxide and with the presence of phosphate inclusions which can be interesting in view of biomedical applications. Titanium and its alloys are largely employed for the development of orthopaedic and dental implants because of their good mechanical strength and low density. Thanks to its thin native oxide layer which prevents ion release, titanium offers good resistance to corrosion in body fluids and good biocompatibility. These properties can be further improved by surface treatments able to grow thicker oxide layers with controlled morphological and physico-chemical properties. Several methods have been used to this purpose, from thermal treatment [1-3], to acid solution immersion [4], peroxide immersion [5], anodic-plasma chemical treatment [6], plasma immersion ion implantation [7] and anodisation [8,9]. Volume 1 | Issue 1