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Study of corrosion and its control in aluminum solar collectors. Annual progress report, June 1, 1976--May 31, 1977

Technical Report ·
OSTI ID:7089196
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The corrosion resistance of aluminum alloys in water/ethylene glycol mixtures has been studied in detail under experimental conditions directly relevant to the operation of existing solar thermal energy collector systems. An aqueous ethylene glycol solution with 35% ethylene glycol by volume was chosen as the typical heat transfer medium throughout the entire program. The scope of this study covers the following range of conditions: (1) four different aluminum alloys (i.e., 99.9%, 1100, 3003 and 3004 series aluminum); (2) 70/sup 0/ to 210/sup 0/F (approx. 20/sup 0/ to 100/sup 0/C); (3) stagnant solution, laminar and turbulent flow; (4) under N/sub 2/ and air; (5) in the presence of contaminants (e.g., Cl/sup -/, Cu/sup +2/ and Fe/sup +3/ ions); and (6) effects of ethylene glycol decomposition products. The program has been divided into five tasks: (I) field study of the existing solar collectors, (II) laboratory study of the corrosion of 1100 series aluminum in ethylene glycol/water solutions, (III) laboratory study of other alloy/coolant systems, (IV) determination of an aluminum alloy galvanic series in ethylene glycol/water, and (V) the study of a method of predicting the onset of pits via direct electrochemical measurement. In these experiments the linear polarization resistance technique is used in determining the overall corrosion rate, along with accompanying quantitative metallographic analysis of pit formation and growth. The status of these five tasks are discussed. (WHK)
Research Organization:
Giner, Inc., Waltham, Mass. (USA)
OSTI ID:
7089196
Report Number(s):
COO/2934-4
Country of Publication:
United States
Language:
English

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Related Subjects

14 SOLAR ENERGY
141000* -- Solar Collectors & Concentrators
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALCOHOLS
ALLOYS
ALUMINIUM
ALUMINIUM ALLOYS
AQUEOUS SOLUTIONS
CHEMICAL REACTIONS
CORROSION
CORROSION PROTECTION
CORROSION RESISTANCE
CORROSIVE EFFECTS
DISPERSIONS
ELECTROCHEMICAL CORROSION
ELEMENTS
FLUIDS
GLYCOLS
HYDROXY COMPOUNDS
METALS
MIXTURES
ORGANIC COMPOUNDS
PITTING CORROSION
POLARIZATION
SOLAR COLLECTORS
SOLUTIONS
STRESS CORROSION
TEMPERATURE EFFECTS
WORKING FLUIDS