Titanium anodizing in citric acid

• Autor(a) principal: Kieser, Tayná Aparecida
• Data de Publicação: 2022
• Outros Autores: Kunst, Sandra Raquel, Morisso, Fernando Dal Pont, Machado, Tiele Caprioli, Oliveira, Cláudia Trindade
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Research, Society and Development
• Texto Completo: https://rsdjournal.org/index.php/rsd/article/view/30872
• topic: Titanio; Anodizado; Acido citrico.; Titanium; Anodizing; Citric acid.; Titânio; Anodização; Ácido cítrico.

The industrial process of anodizing titanium used in implantology and craniofacial orthopedics, currently uses hydrofluoric acid (HF) based electrolyte to obtain porous structures in titanium. HF is highly corrosive and its disposal is restricted to companies with special authorization to do so. Thus, the objective of this work is to anodize titanium samples using citric acid electrolyte and evaluate the behavior of anodized titanium samples under different conditions, determining the best process parameters. The electrolyte concentrations used were: 62%, 31% and 15%, and the anodizing times: 1, 5, 30 and 60 minutes. For that, analyzes of the anodizing transients of the samples and morphological analyzes were carried out by means of Scanning Electron Microscopy (SEM) and Wetability, semiquantitative chemical analyzes by means of Energy Dispersive Spectroscopy (EDS) and also electrochemical analysis of Electrodynamic Polarization. The Ti15-300 and Ti62-1800 samples showed significant porous formations. Through the results obtained, it is possible to affirm that there was chemical dissolution of the oxide to form the pores, due to the concentration of the electrolyte, since it has a small amount of oxygen compared to an aqueous solution. These results were confirmed through tests carried out on the samples after anodizing. Thus, it was concluded that citric acid is a promising alternative to replace the HF-based electrolyte to obtain porous structures, mainly using citric acid electrolyte at a concentration of 15%, with an anodizing time of 5 minutes.