The growth of oxide layers on lead and its alloys at a constant potential in the PbO2 potential region at different temperatures

E. Hämeenoja, Timo Laitinen, Göran Sundholm, Arto Yli-Pentti

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The growth of dense oxide layers on Pb, PbCa and PbCaSn alloys and a low-Sb (0.85%) alloy is sulphuric acid solutions follows a parabolic rate law at a constant potential in the PbO2 potential region.
This proves that the oxidation rate is controlled by a diffusion process. In the case of antimonial alloys with a higher Sb content the parabolic rate law cannot be applied during the early part of the oxidation, which is probably due to the addition reactions of the PbSb eutectic and the precipitated Sb particles.
Compared to pure Pb all the alloying agents studied increase the effective rate constant and decrease the activation energy of the oxidation at a constant potential.
These effects may be due to an increase in the concentration of oxygen vacancies in the oxide layer, changes in the electronic conductivity of the layer or an increased contribution of grain boundary corrosion.
Original languageEnglish
Pages (from-to)233-241
JournalElectrochimica Acta
Volume34
Issue number2
DOIs
Publication statusPublished - 1989
MoE publication typeA1 Journal article-refereed

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Lead alloys
Oxides
Lead
Oxidation
Addition reactions
Oxygen vacancies
Alloying
Temperature
Eutectics
Rate constants
Grain boundaries
Activation energy
Corrosion
Acids

Cite this

Hämeenoja, E. ; Laitinen, Timo ; Sundholm, Göran ; Yli-Pentti, Arto. / The growth of oxide layers on lead and its alloys at a constant potential in the PbO2 potential region at different temperatures. In: Electrochimica Acta. 1989 ; Vol. 34, No. 2. pp. 233-241.
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abstract = "The growth of dense oxide layers on Pb, PbCa and PbCaSn alloys and a low-Sb (0.85{\%}) alloy is sulphuric acid solutions follows a parabolic rate law at a constant potential in the PbO2 potential region. This proves that the oxidation rate is controlled by a diffusion process. In the case of antimonial alloys with a higher Sb content the parabolic rate law cannot be applied during the early part of the oxidation, which is probably due to the addition reactions of the PbSb eutectic and the precipitated Sb particles. Compared to pure Pb all the alloying agents studied increase the effective rate constant and decrease the activation energy of the oxidation at a constant potential. These effects may be due to an increase in the concentration of oxygen vacancies in the oxide layer, changes in the electronic conductivity of the layer or an increased contribution of grain boundary corrosion.",
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The growth of oxide layers on lead and its alloys at a constant potential in the PbO2 potential region at different temperatures. / Hämeenoja, E.; Laitinen, Timo; Sundholm, Göran; Yli-Pentti, Arto.

In: Electrochimica Acta, Vol. 34, No. 2, 1989, p. 233-241.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The growth of oxide layers on lead and its alloys at a constant potential in the PbO2 potential region at different temperatures

AU - Hämeenoja, E.

AU - Laitinen, Timo

AU - Sundholm, Göran

AU - Yli-Pentti, Arto

PY - 1989

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AB - The growth of dense oxide layers on Pb, PbCa and PbCaSn alloys and a low-Sb (0.85%) alloy is sulphuric acid solutions follows a parabolic rate law at a constant potential in the PbO2 potential region. This proves that the oxidation rate is controlled by a diffusion process. In the case of antimonial alloys with a higher Sb content the parabolic rate law cannot be applied during the early part of the oxidation, which is probably due to the addition reactions of the PbSb eutectic and the precipitated Sb particles. Compared to pure Pb all the alloying agents studied increase the effective rate constant and decrease the activation energy of the oxidation at a constant potential. These effects may be due to an increase in the concentration of oxygen vacancies in the oxide layer, changes in the electronic conductivity of the layer or an increased contribution of grain boundary corrosion.

U2 - 10.1016/0013-4686(89)87091-4

DO - 10.1016/0013-4686(89)87091-4

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JO - Electrochimica Acta

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