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A tensiostatic study of the anodic behaviour of tungsten in acid solutions

1975; Elsevier BV; Volume: 42; Issue: 3 Linguagem: Inglês

10.1016/0022-5088(75)90051-x

1878-2728

Agatino Di Paola, F. Di Quarto, G. Serravalle,

Concrete Corrosion and Durability

Tensiostatic anodization of tungsten has been studied in 1 N solutions of H2SO4, HClO42, HNH2SO3 and HCl at 25 °C. For several voltage values, the curves of current vs. time and open-circuit voltage vs. time have been obtained. All results indicate that the oxide films produced during the polarization are slowly dissolved in the acid solutions. The HCl, and to a lesser extent the HNH2SO3 solutions, show a more aggressive behaviour. For values of the applied voltage above about 50 V, gas evolution begins. In the case of HCl solutions, the gas is Cl2and the electrode is rapidly corroded.