Pretreatment effect of the pure titanium surface on hybrid coating adhesion based on tetraethoxysilane and methyltriethoxysilane

• Published in: JCT research Vol. 15; no. 5; pp. 1089 - 1106
• Main Authors: Casagrande, Rosiana Boniatti, Kunst, Sandra Raquel, Beltrami, Lilian Vanessa Rossa, Aguzzoli, Cesar, Brandalise, Rosmary Nichele, de Fraga Malfatti, Célia
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-09-2018; Springer Nature B.V
• Subjects: Adhesion; Biomedical materials; Chemistry and Materials Science; Coating effects; Corrosion and Coatings; Dip coatings; Electrochemical analysis; Field emission microscopy; Immersion coating; Industrial Chemistry/Chemical Engineering; Materials Science; Metal surfaces; Polymer Sciences; Precursors; Pretreatment; Scanning electron microscopy; Silicon; Sodium hydroxide; Sol-gel processes; Stability analysis; Surface energy; Surface preparation; Surface roughness; Surfaces and Interfaces; Tetraethyl orthosilicate; Thermal stability; Thermogravimetric analysis; Thickness; Thin Films; Titanium; Tribology; Wettability; Titanium; Surface modification; MTES/TEOS; Coatings; Sol–gel
• ISSN: 1547-0091; 1935-3804; 2168-8028
• DOI: 10.1007/s11998-017-0035-2

Hybrid coatings based on silicon alkoxide precursors are one of the options for coating metal surface biomaterials such as pure titanium (Ti). However, the nature and the metal surface preparation, before the coating application, are of fundamental importance for perfecting the coating/surface adhesion. In this study, three different pretreatments were used for the Ti surface: Kroll, Piranha and NaOH. After the pretreatment, the coating was applied by the dip-coating process, using the sol–gel method from the silicon alkoxide precursors, tetraethoxysilane and methyltriethoxysilane. The results of thermogravimetric analysis showed that the tested coatings had excellent thermal stability. The pretreatment with NaOH solution increased the surface roughness of the Ti, thus modifying its surface energy and increasing its wettability. Field emission scanning electron microscopy showed a homogeneous coating with good adhesion of the hybrid coating to the Ti surface, and higher layer thickness on the surface treated with NaOH. In addition, its electrochemical performance was better than the surfaces pretreated with acids.
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