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Achievement of Cathodic Protection of Buried Steel Pipelines by Either Passivity or Immunity

Behavior of corrosion protection in passivity and immunity domains respectively by considering the relation between cathodically polarized potential and pH at the steel/soil interface. As an example of corrosion protection in passivity domain steel in aerated sandy soil was taken.

Product Number: 51317--8829-SG
ISBN: 8829 2017 CP
Author: Fumio Kajiyama
Publication Date: 2017
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Corrosion control of steel pipelines in soils can be achieved by applying cathodic protection to make either passivity or immunity of the steel surface. Passivity and immunity domains are depicted by potential-pH diagram presented by M. Pourbaix. This paper elucidates the behavior of corrosion protection in passivity and immunity domains respectively by considering the relation between cathodically polarized potential and pH at the steel/soil interface. As an example of corrosion protection in passivity domain steel in aerated sandy soil was taken. Steel in active SRB (sulfate-reducing bacteria)-containing soil was taken as an example of corrosion protection in immunity domain.

Key words: steel pipelines, cathodic protection, Pourbaix diagram, passivity, immunity, pH, iron bacteria, sulfate-reducing bacteria

Corrosion control of steel pipelines in soils can be achieved by applying cathodic protection to make either passivity or immunity of the steel surface. Passivity and immunity domains are depicted by potential-pH diagram presented by M. Pourbaix. This paper elucidates the behavior of corrosion protection in passivity and immunity domains respectively by considering the relation between cathodically polarized potential and pH at the steel/soil interface. As an example of corrosion protection in passivity domain steel in aerated sandy soil was taken. Steel in active SRB (sulfate-reducing bacteria)-containing soil was taken as an example of corrosion protection in immunity domain.

Key words: steel pipelines, cathodic protection, Pourbaix diagram, passivity, immunity, pH, iron bacteria, sulfate-reducing bacteria

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