Protection of stainless steel in sulfuric acid solution containing hydrogen sulfide by inhibitorsстатья
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Дата последнего поиска статьи во внешних источниках: 11 сентября 2018 г.
Аннотация:The corrosion of chromium-nickel steel 1Kh18N9T in 2 М H2SO4 at t = 20–100°C was
studied using the mass loss method. In addition, steel hydrogenation in the corrosive
medium was measured by the vacuum extraction method. IFKhAN-92 (a 1,2,4-triazole
derivative) and its combination with KI were studied as corrosion inhibitors. It was shown
that 1Kh18N9T steel has low corrosion resistance in H2SO4 solutions, particularly at
temperatures (t) close to 100°C. The steel corrosion rate is k = 1.7–727 g/(m2xh) under the
conditions studied and increases with increasing t. Steel hydrogenation occurs at t = 40–
100°C and is the strongest at 100°C (12 ml / 100 g). The presence of 15 mM H2S in the
H2SO4 solution slows down steel corrosion (k = 2.8–274 g/(m2хh)) but intensifies hydrogen
absorption. The highest content of hydrogen absorbed in the metal (36 ml / 100 g) was
observed at t = 40°C and 1 h exposure of the specimens. It has been shown that, by
themselves, 5 mM IFKhAN-92 or 5 mM KI are not suitable for protection of 1Kh18N9T
steel in the specified media, since IFKhAN-92 has low efficiency in H2SO4 solution
without H2S, whereas, conversely, KI has low efficiency in H2SO4 solution containing H2S.
However, their mixture shows versatile protection in these media. The formulation
containing 2.5 mM IFKhAN-92 + 2.5 mM KI that suppresses steel corrosion in H2Scontaining
medium up to 100оС and totally prevents hydrogen absorption up to 60°C,
inclusive, has been recommended for steel protection in H2SO4, both in the absence and in
the presence of H2S. This mixture is particularly efficient in solutions without H2S where it inhibits steel corrosion in the entire t range studied while keeping the content of hydrogen in the metal at metallurgical level.