Surface changes in well-casing pipe exposed to high concentrations of organics in aqueous solution. Special report
This preliminary study was undertaken to assess how the surface structural characteristics of four common well casing materials-polyvinyl chloride (PVC), Teflon (polytetrafluoroethylene, PTFE), stainless steel 304 (SS304) and stainless steel 316 (SS316)-are affected by exposure to an aqueous solution containing tetrachloroethylene, toluene, p-dichlorobenzene and 0-dichlorobenzene in concentrations near their solubility. Casing samples that had been exposed to a test solution for 1 week, 1 month and 6 months were examined with a scanning electron microscope (SEM) and compared with control samples placed in well water for an equivalent time period. Pieces of casing that had not been placed in any aqueous solution were also examined and are assumed to be representative of the initial structure of the casing's surface. These organics are of concern at hazardous waste sites, where they often occur in ground water. The observations indicate that the surface characteristics of PVC, SS316 and SS304 did not change when exposed to the organic aqueous solution. The surface variability and lack of distinguishing features at high magnification made it difficult to tell if the PTFE surface had changed. However, no obvious changes (swelling, pitting etc.) were seen.
- Research Organization:
- Cold Regions Research and Engineering Lab., Hanover, NH (USA)
- OSTI ID:
- 6652444
- Report Number(s):
- AD-A-222447/5/XAB; CRREL-SR-90-7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CHLORINATED ALIPHATIC HYDROCARBONS
ENVIRONMENTAL EFFECTS
CHLORINATED AROMATIC HYDROCARBONS
GROUND WATER
CONTAMINATION
TOLUENE
WELL CASINGS
CORROSION
AQUEOUS SOLUTIONS
ELECTRON MICROSCOPY
PVC
SOLUBILITY
STAINLESS STEEL-304
STAINLESS STEEL-316
SURFACE PROPERTIES
WATER POLLUTION
ALKYLATED AROMATICS
ALLOYS
AROMATICS
AUSTENITIC STEELS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CORROSION RESISTANT ALLOYS
DISPERSIONS
HALOGENATED ALIPHATIC HYDROCARBONS
HALOGENATED AROMATIC HYDROCARBONS
HEAT RESIS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
HYDROCARBONS
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MICROSCOPY
MIXTURES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLLUTION
POLYMERS
POLYVINYLS
SOLUTIONS
STAINLESS STEELS
STEEL-CR17NI12MO3
STEEL-CR19NI10
STEELS
WATER
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
360604 - Materials- Corrosion
Erosion
& Degradation