Passivation of titanium in molybdate-containing sulphuric acid solution

Tzyy Ping Cheng; Ju Tung Lee; Wen Ta Tsai

doi:10.1016/0013-4686(91)85211-O

Passivation of titanium in molybdate-containing sulphuric acid solution

Tzyy Ping Cheng, Ju Tung Lee, Wen Ta Tsai

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Abstract

The effect of molybdate ions on the passivation reaction of commercial pure (CP) Ti in sulphuric acid solution was studied by conducting an immersion test, measuring dc polarization curves and electrochemical impedance spectroscopy (EIS). It is found that the addition of molybdate in boiling sulphuric acid with concentrations higher than 10^-3 M could greatly reduce the corrosion rate to a negligible value. dc Polarization curves showed that the passivation behaviour was strongly affected by the solution temperature as well as the concentration of molybdate ion present in the sulphuric acid. The passive film resistance (R_pf) determined by EIS was found to increase with the externally applied anodic potential and/or with the molybdate ion concentration. The increase of R_pf is mainly attributed to the thickening process of oxide film at more noble potentials.

Original language	English
Pages (from-to)	2069-2076
Number of pages	8
Journal	Electrochimica Acta
Volume	36
Issue number	14
DOIs	https://doi.org/10.1016/0013-4686(91)85211-O
Publication status	Published - 1991

All Science Journal Classification (ASJC) codes

General Chemical Engineering
Electrochemistry

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10.1016/0013-4686(91)85211-O

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abstract = "The effect of molybdate ions on the passivation reaction of commercial pure (CP) Ti in sulphuric acid solution was studied by conducting an immersion test, measuring dc polarization curves and electrochemical impedance spectroscopy (EIS). It is found that the addition of molybdate in boiling sulphuric acid with concentrations higher than 10-3 M could greatly reduce the corrosion rate to a negligible value. dc Polarization curves showed that the passivation behaviour was strongly affected by the solution temperature as well as the concentration of molybdate ion present in the sulphuric acid. The passive film resistance (Rpf) determined by EIS was found to increase with the externally applied anodic potential and/or with the molybdate ion concentration. The increase of Rpf is mainly attributed to the thickening process of oxide film at more noble potentials.",

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AU - Cheng, Tzyy Ping

AU - Lee, Ju Tung

AU - Tsai, Wen Ta

PY - 1991

Y1 - 1991

N2 - The effect of molybdate ions on the passivation reaction of commercial pure (CP) Ti in sulphuric acid solution was studied by conducting an immersion test, measuring dc polarization curves and electrochemical impedance spectroscopy (EIS). It is found that the addition of molybdate in boiling sulphuric acid with concentrations higher than 10-3 M could greatly reduce the corrosion rate to a negligible value. dc Polarization curves showed that the passivation behaviour was strongly affected by the solution temperature as well as the concentration of molybdate ion present in the sulphuric acid. The passive film resistance (Rpf) determined by EIS was found to increase with the externally applied anodic potential and/or with the molybdate ion concentration. The increase of Rpf is mainly attributed to the thickening process of oxide film at more noble potentials.

AB - The effect of molybdate ions on the passivation reaction of commercial pure (CP) Ti in sulphuric acid solution was studied by conducting an immersion test, measuring dc polarization curves and electrochemical impedance spectroscopy (EIS). It is found that the addition of molybdate in boiling sulphuric acid with concentrations higher than 10-3 M could greatly reduce the corrosion rate to a negligible value. dc Polarization curves showed that the passivation behaviour was strongly affected by the solution temperature as well as the concentration of molybdate ion present in the sulphuric acid. The passive film resistance (Rpf) determined by EIS was found to increase with the externally applied anodic potential and/or with the molybdate ion concentration. The increase of Rpf is mainly attributed to the thickening process of oxide film at more noble potentials.

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Passivation of titanium in molybdate-containing sulphuric acid solution

Abstract

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