Fe
++ and Fe
+++ ion are most usually found in the solutions of acid cleaning of any equipments. Besides, when petroleum reformer is cleaned with acids, a large amount of H
2S is evolved on dissolution of FeS scale and the acid solutions are saturated with H
2S.
The effect of inhibition was examined under the co-existence of these materials with four commercial inhibitors, and the following results were obtained.
1) The effect of H
2S on the corrosion of steel somewhat differed according to the kind of inhibitors, although H
2S was generally considered to increase the corrosion rate.
2) Fe
++ ion scarcely affected the corrosion rate.
3) Fe
+++ ion, in the presence of H
2S, was reduced to Fe
++ and did not accelerate the corrosion rate so remarkably.
Data in some actual field were also shown.
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