Cathodic properties of different stainless steels in natural seawater

Journal Article · Wed May 01 00:00:00 EDT 1985 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3582007· OSTI ID:5265914

Johnsen, R; Bardal, E

The cathodic properties of a number of stainless steels, which were exposed to natural seawater flowing at 0 to 2.5 m/s and polarized to potentials from -300 to -950 mV SCE, have been studied. The current density development at constant potential and the free corrosion potential during the exposure time were recorded continuously. At the end of the exposure period, after approximately 28 to 36 days of exposure, polarization curves were determined. After one to three weeks of exposure, depending on the water velocity, microbiological activity on the surface caused an increase in the current density requirement of the specimen. An explanation for the mechanism behind the current density increase caused by slime production from marine bacteria may be increased exchange current density, i/sub 0/. There was no measurable calcareous deposit on the stainless steel surfaces at the end of the exposure periods.

• Research Organization: The Corrosion Centre, SINTEF, N-7034 Trondheim-NTH
• OSTI ID: 5265914
• Journal Information: Corrosion (Houston); (United States), Vol. 41:5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
02 PETROLEUM
03 NATURAL GAS
STAINLESS STEELS
CORROSION RESISTANCE
ELECTRICAL TESTING
CATHODIC PROTECTION
CORROSIVE EFFECTS
CURRENT DENSITY
SEAWATER
ALLOYS
CHROMIUM ALLOYS
CORROSION PROTECTION
CORROSION RESISTANT ALLOYS
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
NONDESTRUCTIVE TESTING
OXYGEN COMPOUNDS
STEELS
TESTING
WATER
360105* - Metals & Alloys- Corrosion & Erosion
020300 - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing