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Deposition and characterization of a sol-gel Mg-substituted fluorapatite coating with new stoichiometries.

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Title: Deposition and characterization of a sol-gel Mg-substituted fluorapatite coating with new stoichiometries.
Authors: Ferreira, J.M.1,2 (AUTHOR) jmfj@ufb.br, Rajendran, V.3 (AUTHOR), Simonelli, G.1 (AUTHOR) gsimonelli@ufba.br, Silva, A.C.M.1 (AUTHOR) acristinasilva@ufba.br, Santos, L.C.L.1 (AUTHOR) lclsantos@ufba.br, Mattedi, S.1 (AUTHOR), Pontes, L.A.M.1 (AUTHOR) uolpontes@uol.com.br, Costa, I.4 (AUTHOR) icosta@ipen.br, Rossi, J.L.4 (AUTHOR) jelrossi@ipen.br, Baker, M.A.3 (AUTHOR) m.baker@surrey.ac.uk
Source: Applied Surface Science. Mar2020, Vol. 505, pN.PAG-N.PAG. 1p.
Subjects: Stoichiometry, Electrophoretic deposition, Electrolytic corrosion, X-ray photoelectron spectroscopy, Fluorapatite, Surface coatings, Physiologic salines, Scanning electron microscopy
Abstract: • The sol-gel fluorapatite and Mg-substituted (6% and 7% of Mg) fluorapatite coatings on stainless steel were obtained. • After 100 h exposed to simulated body solution Mg-substituted fluorapatite coating with 7% of magnesium presents highest corrosion resistance and adhesion. • The magnesium addition causes a coating densification, lowest number of defects explaining the most capacitive results to coating 7% Mg-substituted fluoroapatite. The calcium substitution for magnesium on fluorapatite is attractive because this element is a natural substitute in biological apatites. There are several published stoichiometries for calcium substituted by magnesium fluorapatites and most works point out that the formation and fixation of biomimetic Ca-P coatings in Ringer's solution were strongly related to Mg2+ content and furthermore the Mg replacement improves the bioactivity of apatite. In the present study, fluorapatite (FA) and fluorapatite substituted with 6% and 7% of magnesium were obtained by deposition via sol-gel coating on substrates of AISI 316L stainless steel to investigate the effect of magnesium substitution on fluorapatite with not yet investigated stoichiometry. Characterization of coating thickness, chemical composition and crystalline structure was performed using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The coating adhesion was evaluated using the pull-out test and the corrosion resistance was undertaken using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The electrochemical results showed improvement in the corrosion resistance of magnesium-fluorapatite compared to fluorapatite coated on AISI 316L stainless steel substrates. The improvement corrosion protection and adhesion performance indicate that such magnesium fluorapatites coatings are very interesting candidates as bioactive coatings for implants. [ABSTRACT FROM AUTHOR]
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Abstract:• The sol-gel fluorapatite and Mg-substituted (6% and 7% of Mg) fluorapatite coatings on stainless steel were obtained. • After 100 h exposed to simulated body solution Mg-substituted fluorapatite coating with 7% of magnesium presents highest corrosion resistance and adhesion. • The magnesium addition causes a coating densification, lowest number of defects explaining the most capacitive results to coating 7% Mg-substituted fluoroapatite. The calcium substitution for magnesium on fluorapatite is attractive because this element is a natural substitute in biological apatites. There are several published stoichiometries for calcium substituted by magnesium fluorapatites and most works point out that the formation and fixation of biomimetic Ca-P coatings in Ringer's solution were strongly related to Mg2+ content and furthermore the Mg replacement improves the bioactivity of apatite. In the present study, fluorapatite (FA) and fluorapatite substituted with 6% and 7% of magnesium were obtained by deposition via sol-gel coating on substrates of AISI 316L stainless steel to investigate the effect of magnesium substitution on fluorapatite with not yet investigated stoichiometry. Characterization of coating thickness, chemical composition and crystalline structure was performed using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The coating adhesion was evaluated using the pull-out test and the corrosion resistance was undertaken using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The electrochemical results showed improvement in the corrosion resistance of magnesium-fluorapatite compared to fluorapatite coated on AISI 316L stainless steel substrates. The improvement corrosion protection and adhesion performance indicate that such magnesium fluorapatites coatings are very interesting candidates as bioactive coatings for implants. [ABSTRACT FROM AUTHOR]
ISSN:01694332
DOI:10.1016/j.apsusc.2019.144393