Study of aluminum corrosion in aluminum solar heat collectors using aqueous glycol solution for heat transfer. Semiannual technical progress report, July 30, 1979-January 31, 1980

Technical Report · Fri Feb 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/5195385· OSTI ID:5195385

Wong, D; Cocks, F H; Giner, J

The present work is addressed primarily to the study of the effects of glycol aging at elevated temperatures (above 100/sup 0/C). Glycols are known to be susceptible to thermal decomposition producing new product species which may be aggressive to aluminum. In addition, the possible breakdown of corrosion inhibitors due to long term exposure to high temperature are also investigated. Both uninhibited and inhibited ethylene (as well as propylene) glycols have been aged at temperatures up to 190/sup 0/C for over 2000 h continuously to date. Aliquot samples of each glycol solution tested in this program were taken at 1000 and 2000 h of exposure for chemical analysis and pH measurement. Based on the data obtained so far, solution pH was found to decrease steadily with exposure time. The critical pitting potential of 1100 series aluminum in a 50 vol % aqueous ethylene glycol solution is reported as functions of both temperature and chloride ion concentration. This information is essential in the cathodic protection of pitting corrosion of aluminum.

• Research Organization: Giner, Inc., Waltham, MA (USA)
• DOE Contract Number: AC04-79CS31072
• OSTI ID: 5195385
• Report Number(s): DOE/CS/31072-T1
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
ALUMINIUM
PITTING CORROSION
GLYCOLS
THERMAL DEGRADATION
SOLAR COLLECTORS
AGING
AQUEOUS SOLUTIONS
CORROSION INHIBITORS
PH VALUE
ALCOHOLS
CHEMICAL REACTIONS
CORROSION
DISPERSIONS
ELEMENTS
EQUIPMENT
HYDROXY COMPOUNDS
METALS
MIXTURES
ORGANIC COMPOUNDS
SOLAR EQUIPMENT
SOLUTIONS
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