Dependence of the rate of corrosion and hydrogen diffusion of 09Mn2Si steel on the concentration of hydrogen sulphide in chloride-acetate environments

B. Datsko, M. Chuchman, V. Ivashkiv, S. Halaichak
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Abstract

It is found that with increasing concentration of hydrogen sulphide (H2S) to 100, 1000 and 2800 mg/dm3 (H2Ssat) the corrosion rate (C) of steel 09Mn2Si increases by ~1,48; 1,58 and ~1,64 times in 24 hours of exposure, however, in 720 h, it increases by ~1,8 and ~3,3 times at its concentration of 1000 mg/dm3 and saturation, while at 100 mg/dm3 C decreases by 1,8 times, which is due to the formation of continuous sulphide films. It is shown that the volume amount of hydrogen in 09Mn2Si steel increases with the increase of H2S content of the solution from 100; 500; 1500 and 2800 mg/dm3 in 1,2; 1,5; 1,9 and 2,5 times. Hydrogen diffusion increases from 0.9·10-6 to 2.7·10-6 cm2/s with the increase of membrane thickness from 0,75 to 1,50 mm and does not depend on the H2S content.
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氯化物-醋酸盐环境中硫化氢浓度对09Mn2Si钢腐蚀速率和氢扩散速率的影响
结果表明:随着硫化氢(H2S)浓度分别增加到100、1000和2800 mg/dm3 (H2Ssat), 09Mn2Si钢的腐蚀速率(C)提高了~1,48;在浓度为1000mg /dm3和饱和时,在720h内,C增加了~1,8和~3,3倍,而在100mg /dm3时,C减少了1,8倍,这是由于形成了连续的硫化物膜。结果表明:溶液中H2S含量从100开始,随着H2S含量的增加,09Mn2Si钢中氢的体积量增加;500;1、2中1500、2800 mg/dm3;1、5;1 9和2 5次。随着膜厚从0.75 mm增加到1.5 mm,氢扩散从0.9·10-6 cm2/s增加到2.7·10-6 cm2/s,且与H2S含量无关。
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