Materials Technology for Coal-Conversion Processes Quarterly Report: October-Decemeber 1978 Page: 29
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corrosion, i.e., the combined value of the thickness of surface scale and
internal corrosive penetration, for the various materials varies from 7 to
15 um. It should be noted that although the values of total corrosion for
Inconel 601, Inconel 617, and Inconel 671 specimens shown in Figs. 27 and
28 are small, the internal corrosive attack in some areas of these specimens
was significantly greater. The results for the corrosion tests in which
salt was present show that for all materials, the addition of 0.3 mol %
CaCl2 to the fluidized bed has no effect on the corrosion behavior. In
fact, for most of the materials, the total corrosion is slightly lower than
that without salt addition. However, addition of 0.5 mol % NaCl increases
the total corrosion in all the materials. The high-nickel alloys, viz.,
Inconel 601, Inconel 617, Inconel 671, RA 333, and Incoloy 800 show sig-
nificant increase in internal corrosive penetration.
Examination of the data for Type 310 stainless steel from the
three corrosion tests shows that the total corrosion of this material is
greater at the location 102 mm above the gas distributor plate (Fig. 27)
than at the 610-mm position (Fig. 28). Similar comparisons for other
materials will provide a better understanding of the effect of position
within the combustor on the corrosion behavior.
d. Conclusions
Results from the 360-ks tests indicate that the addition of
0.3 mol % CaCl2 to the fluidized bed has no effect on the corrosion behavior
of the various materials. The addition of 0.5 mol % NaCl increases the cor-
rosion rates of all the materials. In the presence of NaCl, austenitic
stainless steels and Haynes alloy 188 exhibit better corrosion resistance
than the high-nickel alloys, although Hastelloy-X, Inconel 625, and Inconel
718 also show good resistance to accelerated corrosion. Longer-duration
tests are being considered to further evaluate the effect of salts on the
corrosion behavior of various structural materials.29
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Argonne National Laboratory. Materials Science Division. Materials Technology for Coal-Conversion Processes Quarterly Report: October-Decemeber 1978, report, 1979?; Argonne, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc283206/m1/43/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.