Corrosion inhibitors for SO/sub 2/ scrubber outlet ducts: Final report

Technical Report · Sat Jul 01 04:00:00 EDT 1989

OSTI ID:5959235

Phull, B S

Baseline (inhibitor-free) corrosion data were obtained on 1020 carbon steel, Types 316L and 317L stainless steels, and alloys G-3 and 625, in the outlet duct of the model SO/sub 2/ scrubber. The effect of mounting replicate test specimens of each alloy at 0, 8 and 16 mm from the scrubber wall, on their corrosion behavior, was also investigated in one of the baseline runs. In separate runs, the influence on corrosion behavior of spraying water, an alkaline solution, and a 0.1% solution of a commercial inhibitor (Cronox-806) was investigated. The objectives of the water and alkaline spray tests were to determine the roles played by water and pH respectively, in mitigating corrosion in the final run of the study (Phase 1), where a 0.1% solution of Na/sub 2/HPO/sub 4/ had been sprayed in the outlet duct. Further evaluation of the Cronox-806 inhibitor was based on dramatic inhibition obtained from alloy G-3 in a screening test in the previous (Phase 1) study. Corrosion potential and polarization resistance measurements were performed intermittently on separate electrodes of the five alloys, exposed in the outlet duct, during each test run. 24 refs., 45 figs., 8 tabs.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (USA)
• OSTI ID: 5959235
• Report Number(s): EPRI-GS-6464
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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ALLOYS
AUSTENITIC STEELS
CARBON STEELS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHEMISTRY
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CORROSION INHIBITORS
CORROSION PROTECTION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DESULFURIZATION
DOCUMENT TYPES
DUCTS
EFFICIENCY
ELECTROCHEMISTRY
EQUIPMENT
FLUE GAS
GASEOUS WASTES
HEAT RES
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
PROGRESS REPORT
RECOMMENDATIONS
SCRUBBERS
STAINLESS STEEL-316L
STAINLESS STEELS
STEEL-CR17NI12MO3-L
STEELS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES