According to the EIS analysis is suggested a charge transfer resistance and the presence of different diffusional process through the sulfide film, e.g., iron ions and atomic hydrogen , as well as the bisulfide ions favoring the growth of the sulfide film.
Kane, "Prediction and assessment of ammonium bisulfide corrosion under refinery sour water service conditions," NACE Paper No.
The precipitation of uraninite via reduction of uranyl complexes can proceed with bisulfide
(see (4)) or magnetite ([Fe.sup.2+]) as reductants.
 submitted a possible gold precipitation trigger related to phase separation where the partitioning of reduced gas in the vapor phase modifies the oxidation state of the liquid, which destabilized bisulfide
complexes Au[(HS).sub.2.sup.-] and hence gold solubility.
Hydrocarbons which are weaker ligands would react with sulfates to generate bisulfide
(H[S.sup.-]), which in turn would easily react with metal chlorides to form metal sulphides according to the following mass balance equations:
Gold is predominantly transported as gold chloride (Au[Cl.sup.2-]) and gold bisulfide
complexes (Au[(HS).sub.2.sup.-]) in hydrothermal solutions [104-107].
Thus the role of SRB would be indirect through the production of final (sulfides, bisulfides
, hydrogen sulfide) or intermediate metabolites (thiosulfates, polythionates) which are corrosive to carbon steel; d) cathodic effects such as cathodic depolarization attributed to SRB hydrogenase of to iron sulfide films would be developed later that passivity breakdown when the corrosion process is in progress; e) the corrosive action of biogenic sulfides can be enhanced by other corrosive ions already present in the medium (e.g.