Investigation of titanium corrosion in concentrated NaOH solutions

Abstract

The rate of both spontaneous and polarization assisted formation of oxide films on commercially grade titanium, DIN 3.7025, was studied in concentrated, 1–5M NaOH solutions, with particular attention to the early stages of oxide formation. Simultaneous chemical dissolution of oxides was considered. The rate of spontaneous oxide formation was examined with cyclic voltammetry as an in‐situ method. The shape of potentiodynamic curves recorded in different alkaline solutions indicated that the electrolyte concentration affects the oxide composition. Titanium electrodes were covered with oxide films of different thickness, and the time dependence of polarization resistance was measured under a fixed anodic polarization. The polarization resistance may either increase or decrease tending to attain a stationary value, which, for a fixed polarization, depends on both the initial thickness and the NaOH concentration.

In Vitro Investigation of Hemocompatibility of Hydrothermally Treated Titanium and Titanium Alloy Surfaces

“…The rate of the reaction is influenced by various factors such as the concentration of NaOH, reaction temperature, and time. 38 These corrosive reactions led to unique nanostructures on the material surface. 39 The modified surfaces were characterized for surface morphology, surface energy, surface chemistry, and crystal structure.…”

“…In this study, titanium and its alloy, Ti–6Al–4V, were exposed to an alkaline solution (NaOH), which leads to a corrosive reaction on the surface along with oxidization of the element(s) present (eq ). Various permutations and combinations of variables such as NaOH concentration, temperature, and time for treatment were used to determine the optimal conditions for fabrication that resulted in uniform and repeatable nanostructures on different surfaces. The rate of the reaction is influenced by various factors such as the concentration of NaOH, reaction temperature, and time . These corrosive reactions led to unique nanostructures on the material surface .…”

The Galvanic Effect of Titanium and Amalgam in the Oral Environment

“…The dissolution in basic solution comes as a relative surprise, as an oxide film would be expected to form, hindering dissolution. Mentus et al studied the corrosion of Ti in 1–5M of NaOH and saw a similarly surprising result [ 40 ]. What may be occurring is the formation of low-quality TiO 2 , with the subsequent dissolution of TiO 2 by the production of titanates: …”

Corrosion Behavior Analysis of Plasma-assited PVD Coated Ti-6Al-4V alloy in 2 M NaOH Solution

“…These results agree with Pjescic and collaborators 13 , who studied titanium's behavior in concentrated NaOH solutions, ranging from 1 to 5 M at 25 °C. Shahba et al…”

“…TiO 2 is formed spontaneously on the surface of Ti-6Al-4V alloy when immersed in NaOH according to the following anodic reaction 11,13 : the amplitude of the oscillating current, ω is the angular frequency of disturbance and ϕ is the phase angle 19 . Electrochemical impedance spectroscopy reflects the dielectric behavior, the oxi-reduction reactions and the mass transfer in the electrochemical interface (EI).…”