Effect of marine microbiofouling and countermeasures on corrosion of some aluminum alloys under OTEC heat exchanger conditions
Aluminum alloys 5052, 3004 and Alclad (7072) 3003 and 3004 have been exposed to warm Hawaiian surface sea water and cold, deep ocean water under simulated OTEC heat exchanger conditions for over three years. Flow velocity has been maintained at 1.85 m/s ( 6 fps) through loops of tubular samples which also contained heat transfer monitors. Development of heat transfer resistance due to biofouling was monitored and biofouling and corrosion rates were determined. Loops were operated under the following conditions: cold water - no countermeasures; warm water - free fouling for 25-40 days, then brushing clean; chlorinated on an intermittent schedule to maintain zero heat transfer resistance; and mechanically cleaned with sponge rubber balls on a daily schedule. It was found that the corrosion film does provide some protection of biofouling which becomes embedded in it, but that neither biofilm, nor chlorination, nor intermittent brushing had any effects on the corrosion rate. Daily mechanical cleaning, on the other hand, caused severe erosion-corrosion of all alloys tested, except alloy 5052.
- OSTI ID:
- 6959488
- Report Number(s):
- CONF-870314-
- Resource Relation:
- Conference: Corrosion '87, San Francisco, CA, USA, 9 Mar 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CORROSION PROTECTION
HEAT EXCHANGERS
BIOLOGICAL FOULING
OCEAN THERMAL POWER PLANTS
AQUATIC ORGANISMS
CLEANING
COMPARATIVE EVALUATIONS
CORROSION
CORROSIVE EFFECTS
MATERIALS TESTING
MONITORING
PACIFIC OCEAN
SEAWATER
THERMODYNAMIC PROPERTIES
ALLOYS
CHEMICAL REACTIONS
FOULING
HYDROGEN COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWER PLANTS
SEAS
SOLAR POWER PLANTS
SURFACE WATERS
TESTING
THERMAL POWER PLANTS
WATER
140800* - Solar Energy- Ocean Energy Systems
360105 - Metals & Alloys- Corrosion & Erosion