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Abstract Corrosion behavior of pure titanium in H2SO4, HCl and HNO3 with different concentrations of F- was studied with electrochemical testing and morphology observation. The threshold F- concentration triggering severe… Click to show full abstract
Abstract Corrosion behavior of pure titanium in H2SO4, HCl and HNO3 with different concentrations of F- was studied with electrochemical testing and morphology observation. The threshold F- concentration triggering severe corrosion is between 0.0005 and 0.001 M in the three acids. The F- promotes anodic dissolution and inhibits oxygen reduction, resulting in the decrease of cathodic current density. The corrosion process presents a two-step reaction mechanism, and the influence mechanism of fluoride in different acids is different. The oxidizing NO- 3 participates in the corrosion reaction as an oxidant and accelerates the corrosion, resulting in the most severe corrosion in fluoride-bearing HNO3.
Journal Title: Corrosion Science
Year Published: 2021
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