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Effect of HAP decomposition on the corrosion behavior of Ti–HAP biocomposites
Author(s) -
Toptan Fatih,
Alves Alexandra C.,
Ferreira Margarida A.,
da Silva Oliveira Catarina I.,
Pinto Ana M.P.
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201810049
Subject(s) - corrosion , materials science , dielectric spectroscopy , decomposition , composite number , electrochemistry , chemical engineering , polarization (electrochemistry) , metallurgy , composite material , chemistry , electrode , organic chemistry , engineering
Ti–HAP biocomposites are gained attention for combining the attractive properties of Ti and hydroxyapatite (HAP). However, the decomposition of HAP at elevated processing temperatures is a major concern since it can lead to structural flaws and may deteriorate the corrosion resistance of Ti. The present study aims to investigate the corrosion behavior of Ti–HAP composite processed by powder metallurgy by performing potentiodynamic polarization and electrochemical impedance spectroscopy in 0.9 wt% NaCl solution at body temperature. Results show that the presence of Ti lowers the HAP decomposition temperatures resulting in the formation of HAP‐depleted zones acting as electrochemically active sites, decreasing the corrosion resistance.