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Investigating effects of potential excursions and pH variations on cathodic protection using new electrochemical testing cells

journal contribution
posted on 01.01.2016, 00:00 authored by Ying HuoYing Huo, Mike Yongjun TanMike Yongjun Tan, Maria ForsythMaria Forsyth
Excursion from safe cathodic protection (CP) potentials occurs on buried steel pipelines due to various forms of electrical interferences such as stray currents. Variations in pH can also occur over some pipeline sections such as seashore and river crossing pipes. Currently, the exact effects of potential excursion and the pH on CP efficiency have not been sufficiently quantified preliminary due to difficulties in measuring these effects. In this work, these effects have been investigated using electrochemical cells designed to mimic the high resistivity and pH conditions observable over underground steel pipes, including a new electrochemical cell that has been designed to facilitate the effective simulation and control of pH, potential excursion and other CP testing parameters. The pH has been shown to be a key factor affecting the patterns of corrosion and CP efficiency. Localised corrosion has been found to be the dominating form of corrosion under potential excursions conditions.

History

Journal

Corrosion engineering, science and technology

Volume

51

Issue

3

Pagination

171 - 178

Publisher

Taylor & Francis

Location

Abingdon, Eng.

ISSN

1478-422X

eISSN

1743-2782

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2016, Institute of Materials, Minerals and Mining