Materials testing in synthetic FGD environments. Final report

Technical Report · Thu Nov 01 04:00:00 EST 1984

OSTI ID:6428870

Koch, G H; Beavers, J A; Christman, T K

A laboratory study was performed to evaluate the corrosion behavior of several alloys in simulated flue gas desulfurization (FGD) or SO/sub 2/ scrubber systems. The alloys were selected according to generic groups, e.g., nickel-base alloys, austenitic stainless steels, ferritic and duplex stainless steels, titanium and zirconium alloys and cobalt-base alloys. The synthetic scrubber environments contained chlorides, fluorides, calcium, magnesium, sodium and sulfates. The study showed that alloys suffered the most severe corrosion at intermediate chloride concentrations, 30,000 g/m/sup 3/, low pH and high temperatures, whereas at high ionic concentrations corrosion rates reduced. It was further shown that the amount of acid needed to achieve a pH of 1 was much higher at the low and intermediate chloride concentrations than at the high concentrations. It was argued that the higher hydrogen ion concentration would increase the corrosion rate of the alloys studied and that addition of fluoride to the test solution would further increase the corrosion rates. Although the nickel-base alloys were generally found to be the most resistant to different forms of corrosion attack such as general corrosion, pitting, intergranular corrosion and stress-corrosion cracking, other alloys such as the ferritic and duplex stainless steels and titanium alloys also showed excellent corrosion resistance in certain environments. However, titanium suffered severe attack in solutions that contained relatively high fluoride concentrations. 43 references, 84 figures, 39 tables.

• Research Organization: Battelle Columbus Labs., OH (USA)
• OSTI ID: 6428870
• Report Number(s): EPRI-CS-3740; ON: TI85920139
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
AIR POLLUTION CONTROL
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
COBALT ALLOYS
COBALT BASE ALLOYS
CONTROL
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DATA
DESULFURIZATION
EQUIPMENT
EXPERIMENTAL DATA
FERRITIC STEELS
FLUE GAS
FLUORIDES
FLUORINE COMPOUNDS
GASEOUS WASTES
HALIDES
HALOGEN COMPOUNDS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PH VALUE
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SCRUBBERS
SIMULATION
STAINLESS STEELS
STEELS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TESTING
TITANIUM ALLOYS
WASTES
ZIRCONIUM ALLOYS