Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
On the Corrosion of Cast Iron by Various Sulphuric Gases at High Temperature
Hiroshi NAKAI
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1961 Volume 47 Issue 11 Pages 1613-1616

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Abstract

Sulphidation of iron and steel at high temperatures is lately discussed in many literatures. The author has experimented on the sulphidation of cast iron at high temperature. In this report, he dealt with the corrosion of cast iron at high temperature in S vapour, CS2 vapour, H2S gas and SO2 gas. The following results were obtained:
(1) The sulphidation product of cast iron was composed of pyrrhotite Fe1-xS. And from the X-ray analysis, it was found that the outer layer was composed of FeS and FeS2 in Svapour, FeS in CS2 vapour, FeS in H2S gas and that FeS and Fe3O4 in SO2 gas. In the outer layer C and P did not diffuse, on the contrary Mn diffused freely and Si did a little.
(2) The sulphidation rate was controlled by the parabolic rate law, and the following formula was obtained:
S vapour: W2=0.36×10-8 t
CS2 vapour: W2=0.64×10-7t
H2S gas: W2=1.15×10-6t
SO2 gas: W2=0.12×10-7 t W: sulphidation rate, g/cm2 t: sulphidation time, s.
(3) In this experiment, the sulphidation rate of cast iron in H2S gas was superior to those in other gases, which followed in order of CS2 vapour, SO2 gas and S vapour.

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© The Iron and Steel Institute of Japan
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