Study of corrosion and its control in aluminum solar collectors. Progress report, September 1, 1977--March 31, 1978
Aluminum solar heat collectors operating on water/glycol heat transfer fluids are potentially attractive but for the critical problem of aluminum corrosion. A non-destructive electrochemical technique (linear polarization resistance method) was developed to determine the overall corrosion rate under various conditions. It was concluded that uninhibited ethylene glycol solutions most probably will cause catastrophic plant failure when used as a heat transfer medium in an aluminum solar collector system. The linear polarization resistance method and the pit depth measurement technique are used to evaluate the corrosion problems. In addition, a thin foil test method and an aluminum circulation panel (with a heat rejecting surface) were developed and successfully applied. The effects of using chemical scavengers for contaminants were also investigated. Also included are: (a) an investigation of the performance of the inhibited solution at high temperature (T > 100/sup 0/C), (b) an extension of the work to propylene glycol solutions, (c) the verification of the cube root law, and (d) the determination of the parameter a. An extensive literature review showed that phosphates, borates, nitrates, silicates and sodium mercaptobenzothiazole are the effective corrosion inhibitors used in ethylene glycol solutions.
- Research Organization:
- Giner, Inc., Waltham, MA (USA)
- OSTI ID:
- 6563670
- Report Number(s):
- COO-2934-6
- Country of Publication:
- United States
- Language:
- English
Similar Records
Study of corrosion and its control in aluminum solar collectors. Quarterly progress report, June 1, 1977--August 31, 1977
Study of corrosion and its control in aluminum solar collectors. Annual progress report, June 1, 1976--May 31, 1977
Related Subjects
141000* -- Solar Collectors & Concentrators
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALCOHOLS
ALKALI METAL COMPOUNDS
ALUMINIUM
ANTIFREEZE
AZOLES
BENZOTHIAZOLES
BORATES
CHEMICAL REACTIONS
CORROSION
CORROSION INHIBITORS
CORROSION PROTECTION
CORROSION RESISTANCE
ELEMENTS
FAILURES
FLUIDS
GLYCOLS
HEAT TRANSFER FLUIDS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
IMPURITIES
METALS
NITRATES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PITTING CORROSION
POLARIZATION
SCAVENGING
SILICATES
SILICON COMPOUNDS
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SODIUM NITRATES
SODIUM PHOSPHATES
SODIUM SILICATES
SOLAR COLLECTORS
THIAZOLES
WATER