Corrosion inhibitors for FGD systems
Laboratory screening tests were conducted to evaluate the performance of seven corrosion inhibitors on the corrosion behavior of 1020 carbon steel, Type 316L stainless steel, alloy G-3 and Grade 2 titanium in a pilot flue gas desulfurization limestone scrubber. Replicate coupon and U-bend specimens of the three passive alloys were exposed in the absorber; and replicate specimens of all four materials were exposed in the outlet duct pre-reheat and post-reheat test zones. Linear polarization and potentiodynamic polarization tests were also performed on electrodes of all four materials in the slurry and in the outlet duct condensate environments. In the majority of cases, inhibitor was introduced into the slurry at the start of each test. Grade 2 titanium did not suffer any corrosion attack in any of the tests, either in the presence or absence of corrosion inhibitor. In the absorber, no inhibitor was completely effective in eliminating crevice corrosion, the predominant form of attack on alloy G-3 and 316L stainless steel. In the outlet duct pre-reheat zone, carbon steel suffered general corrosion; and alloy G-3 and 316L stainless steel suffered bold surface pitting and crevice corrosion under the coupon specimen mounting washers in the control tests. Only one inhibitor, a complex amine (Cronox 806), when added directly to the slurry appeared to provide complete inhibition in alloy G-3 in the outlet duct pre-reheat zone. Significant inhibition of corrosion of 316L stainless steel and alloy G-3 was observed in the outlet duct pre-reheat zone when a 1% solution of Na/sub 2/HPO/sub 4/ was injected continuously at a rate of 25 mL/min. Corrosion of all four materials was reduced significantly when subjected to reheat conditions. No stress corrosion cracking was observed on any of the materials in any test zone. 51 refs., 28 figs., 13 tabs.
- Research Organization:
- LaQue Center for Corrosion Technology, Inc., Wrightsville Beach, NC (USA); Electric Power Research Inst., Palo Alto, CA (USA)
- OSTI ID:
- 6598653
- Report Number(s):
- EPRI-CS-5157; ON: TI87920418
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CORROSION INHIBITORS
FLUE GAS
DESULFURIZATION
SCRUBBERS
CORROSION PROTECTION
CREVICE CORROSION
MATERIALS TESTING
PITTING CORROSION
ACID PHOSPHATES
AMINES
CARBON STEELS
COMPARATIVE EVALUATIONS
ECONOMIC ANALYSIS
ELECTROCHEMISTRY
FOSSIL-FUEL POWER PLANTS
LIME-LIMESTONE WET SCRUBBING PROCESSES
NICKEL BASE ALLOYS
RECOMMENDATIONS
STAINLESS STEEL-316
STAINLESS STEELS
STRESS CORROSION
TITANIUM
ALLOYS
CHEMICAL REACTIONS
CHEMISTRY
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
ECONOMICS
ELEMENTS
EQUIPMENT
GASEOUS WASTES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
METALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
SCRUBBING
STEELS
TESTING
THERMAL POWER PLANTS
TRANSITION ELEMENTS
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
360105 - Metals & Alloys- Corrosion & Erosion