Abstract
<p class="PaperAbstract"><span lang="EN-US">Electrochemical formation of passive films and active/passive transition on Ti and Nb metal surfaces in various concentrations of H<sub>2</sub>SO<sub>4</sub> and KOH solutions was investigated using potentiostatic and cyclic voltammetry methods. By simultaneous electrochemical and in-situ ellipsometric measurements the coefficients of film thickness growth of passive films in the potential region from -1.5 V to 4 V were determined. Results indicate the strong influence of the concentration and electrolyte nature to the active/passive transitions and stability of passive films. The influence of cathodic pre-treatment on the passive films dissolution and appearance of the reactivation peaks during the reverse potential cycling were shown. By multiple cycle sequences in which the final anodic potential was gradually enlarged, the barrier properties of passive films on investigated electrodes were confirmed. The electrochemical and ellipsometric data showed that the passive films formed on Nb electrode are more resistant that passive films formed on Ti electrode, especially in higher concentrations of investigated aggressive solutions.</span></p><br />
Highlights
Over the past 50 years there has been a growing interest for the use of titanium and niobium, as well as theirs alloys, in various branches of the chemical and mechanical industry as construction materials, in transport and stocking of aggressive fluids
Results indicate the strong influence of the concentration and electrolyte nature to the active/passive transitions and stability of passive films
The electrochemical and ellipsometric data showed that the passive films formed on Nb electrode are more resistant that passive films formed on Ti electrode, especially in higher concentrations of investigated aggressive solutions
Summary
Over the past 50 years there has been a growing interest for the use of titanium and niobium, as well as theirs alloys, in various branches of the chemical and mechanical industry as construction materials, in transport and stocking of aggressive fluids. Abstract Electrochemical formation of passive films and active/passive transition on Ti and Nb metal surfaces in various concentrations of H2SO4 and KOH solutions was investigated using potentiostatic and cyclic voltammetry methods. By simultaneous electrochemical and in-situ ellipsometric measurements the coefficients of film thickness growth of passive films in the potential region from -1.5 V to 4 V were determined.
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