Page 743 - Corrosion Engineering Principles and Practice

694 C h a p t e r 1 5 H i g h - Te m p e r a t u r e C o r r o s i o n 695

10.00

Lines of constant
corrosion rates

0.51 mm y – 1
0.38 ..
0.25 ..
0.18 ..
1.00 0.13 ..
0.10 ..
0.076 ..
Hydrogen sulfide (%) 0.025 ..
0.051 ..

0.10

0.01
250 300 350 400 450 500 550 600 650 700 750
Temperature (°C)

FIGURE 15.20 Effect of temperature and hydrogen sulfide concentration
on corrosion rates of austenitic stainless steels for exposure longer than
150 hours.

one year of exposure (note the decreasing corrosion penetration
scale in Figs. 15.22 to 15.24). The carbon steel line, in Fig. 15.21, stops
for lower concentrations of H S because FeS is not stable and the
2
steel does not corrode in such environment [2]. Increasing the
temperature and H S concentration increases the sulfidation rate.
2