ISSN:
1573-4889
Keywords:
sulfidation
;
oxidation
;
alloy 800H, SO2−O2
;
H2−H2S
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The high-temperature-corrosion behavior of alloy 800H has been studied in an oxidizing (SO2−O2, $$P_{O_2 }$$ =0.23 atm, $$P_{s_2 } $$ =1.9×10−29 atm) and a reducing (H2−H2S−CO−CO2−N2, $$P_{O_2 }$$ =1.5×10−18 atm $$P_{s_2 } $$ =4.3×10−8 atm, ac=0.03) sulfidizing environment, at 750°C and 850°C, respectively. When corroded in SO2−O2, the protective chromia scale which developed on the alloy in the early stages cracked and spalled in quite a short time period. This led to the growth of iron and nickel sulfides beneath the chromia layer, causing more chromia spallation. When correded in H2−H2S−CO−CO2−N2, the alloy exhibited breakaway corrosion in about 35hr, at which stage liquid nodules formed on the sample surface. The nodules were studied in detail and were found to consist of three layers. The growth mechanism of such nodules is proposed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01196644
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