Corrosion resistance of metallic solar absorber materials in a range of heat transfer fluids. Final technical report
The work described in this report is intended to provide manufacturers, designers, and installers with reliable corrosion compatibility data, meaningful maintenance schedule, and confidence in durability and performance of solar collector units. The corrosion behavior of Cu alloy 122, Al alloy 1100, mild steel 1010, and a ferritic stainless steel (alloy 444) was determined in a variety of potential solar heat transfer fluids. The fluids included potable waters, water glycol solutions, and four non-aqueous fluids. The test apparatus cycled the temperatures of the fluids through those typical of an operating solar energy collector unit. The 444 stainless steel was the most corrosion resistant material and in uninhibited solutions demonstrated only extremely shallow pits during the 180 day test. The use of inhibited solutions generally prevented pits from forming. Cu alloy 122 showed quite low corrosion rates in uninhibited solutions although the presence of excess solder flux promoted some crevice corrosion. In such solutions, uniform, corrosive attack produced general surface roughening along with a protective surface oxide. The overall corrosion rate of the alloy was generally lower in inhibited glycol solutions although pitting within the crevice region occurred in limited cases. Exposure in the non-aqueous fluids resulted in extremely low corrosion rates with little evidence of localized attack.
- Research Organization:
- Olin Corp., New Haven, CT (USA). Metals Research Lab.
- DOE Contract Number:
- AC04-81AL16222
- OSTI ID:
- 6031124
- Report Number(s):
- DOE/AL/16222-T1; ON: DE85004586
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CORROSION RESISTANCE
CARBON STEELS
COPPER ALLOYS
GLYCOLS
CORROSIVE EFFECTS
HEAT TRANSFER FLUIDS
SOLAR ABSORBERS
STAINLESS STEELS
WATER
SIMULATION
SWIMMING POOLS
TESTING
ALCOHOLS
ALLOYS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
EQUIPMENT
FLUIDS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SOLAR EQUIPMENT
STEELS
SURFACE WATERS
141000* - Solar Collectors & Concentrators
360105 - Metals & Alloys- Corrosion & Erosion