Pitting corrosion of nominally protected land-based pipelines

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Materials Performance; (USA)

OSTI ID:6064805

Cherry, B W ^[1]; Gould, A N ^[2]

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1. Monash Univ., Clayton (Australia). Dept. of Materials Engineering
2. Corrosion Mitigation Division, Engineering Department, Gas and Fuel Corporation of Victoria, Melbourne, Victoria 3000 (AU)

Pitting associated with a cathodically disbonded area adjacent to a coating holiday has been observed on pipelines that are nominally subjected to an adequate level of cathodic protection. To examine the reason for this pitting, a technique has been developed for the examination of both the potential profile and the composition of the solution within the crevice formed beneath the coating suggest that most of the steel in the crevice is in the passive state and that disbondment of the coating takes place either by dissolution of the passive film or as a result of an instability of the coating/substrate interface as a result of the cathodic polarization.

• OSTI ID: 6064805
• Journal Information: Materials Performance; (USA), Vol. 29:8; ISSN 0094-1492
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
02 PETROLEUM
03 NATURAL GAS
36 MATERIALS SCIENCE
PIPELINES
PITTING CORROSION
STEELS
CREVICE CORROSION
CATHODIC PROTECTION
CHEMICAL COMPOSITION
INTERFACES
PASSIVATION
POLARIZATION
PROTECTIVE COATINGS
THIN FILMS
ALLOYS
CHEMICAL REACTIONS
COATINGS
CORROSION
CORROSION PROTECTION
FILMS
IRON ALLOYS
IRON BASE ALLOYS
420205* - Engineering- Transport & Storage Facilities- (1980-)
022000 - Petroleum- Transport
Handling
& Storage
032000 - Natural Gas- Transport
Handling
& Storage
360105 - Metals & Alloys- Corrosion & Erosion