Galvanostatic anodization of titanium has been studied in N2-de-aerated, 1 normal solutions of NaOH, Na2SO4, H2SO4, HCI, HClO4, HNO3, and H3PO4 at 25 C at current densities ranging from (4 to 50) 10−6 Acm−2. Valve metal behavior was evident in all media. The parameters of the empirical law are calculated; both were highest in the NaOH solution and lowest in the H2SO4 solution. From unitary formation rate values, the following arrangement of passivation was obtained: NaOH > Na2SO4 > HClO4 > HNO3 > HCl > H3PO4 > H2SO4. The open circuit potential rate of increase with oxide accumulation parallels the passivation property of the medium. Oxide building continues in acid media above the arrest potential.

Subject
Circuit potentials, Oxides, Oxide formation, Oxide films, Open circuits, Constants, Current densities, Titanium, Polarization, Anodic polarization, Electrodes, Electrolytes, Electrode potential
National Association of Corrosion Engineers
1988
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