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Visualizing dynamic and localized corrosion processes on cathodically protected steel exposed to soil with different moisture contents

journal contribution
posted on 2019-04-01, 00:00 authored by Ke Wang, Bob VarelaBob Varela, Mike Yongjun TanMike Yongjun Tan
Probing dynamic and localized electrode processes occurring on steel buried in inhomogeneous soils is a technological challenge. In this work, current mapping obtained with an electrochemically integrated multielectrode array has been used, in conjunction with electrode potential and surface pH monitoring, to address this challenge by enabling the visualization of dynamic localized electrode processes occurring on steel surfaces buried in soil. This has enabled understanding of localized corrosion initiation behavior of steel in soil with different moisture contents under the scenario that cathodic protection (CP) was disrupted. Soil moisture contents was found to influence the initiation of localized corrosion by affecting prior-CP generated surface pH and local hydroxyl depletion rates. The maximum localized corrosion was found to occur at 60% water holding capacity. Electrochemically calculated corrosion damages have been verified by surface profilometry measurements.

History

Journal

Corrosion: the journal of science & engineering

Volume

75

Issue

4

Pagination

398 - 407

Publisher

NACE International

Location

Houston, Tex.

ISSN

0010-9312

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2019, NACE International