The anodic behavior of iron in hydrogen sulfide solutions
- SRI International, Menlo Park, CA (USA)
- Auckland Univ. (New Zealand). Dept. of Chemistry
The anodic behavior of iron in 0.032 mol . L/sup -1/ NaCl/0.003 mol . L/sup -1/ NaHCO/sub 3/ and 1 mol . L/sup -1/ Na/sub 2/SO/sub 4//0.003 mol . L/sup -1/ NaHCO/sub 3/ solutions containing 0.05 mol . L/sup -1/ H/sub 2/S at ambient temperature was studied using cyclic voltammetry and the potentiostatic technique. In both solutions, a nonprotective film of mackinawite (Fe/sub 1+chi/S) was formed on the iron, but the film growth kinetics differ for the two solutions. The film growth in chloride solutions does not appear to follow a conventional type of model for multilayer fils whereas the formation of the film in sulfate solutions can be represented in terms of a pre-resistance model. At more anodic potentials, the mackinawite is oxidized to a higher sulfide, possibly pyrite (FeS/sub 2/), as suggested from a comparison of the anodic and cathodic peak potentials with the equilibrium potential. The formation of the higher sulfide(s) in the chloride solution appears to follow a similar film growth mechanism to that for mackinawite, whereas it is not clear whether this is the case for the sulfate solution.
- OSTI ID:
- 5374980
- Journal Information:
- Corrosion (Houston); (USA), Vol. 45:5; ISSN 0010-9312
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROGEN SULFIDES
CORROSIVE EFFECTS
IRON
CHEMICAL REACTION KINETICS
IRON SULFIDES
THIN FILMS
SOLUTIONS
ANODES
CHLORIDES
ELECTROCHEMISTRY
POTENTIOSTATS
SODIUM CARBONATES
SODIUM SULFATES
VOLTAMETRY
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMISTRY
CHLORINE COMPOUNDS
DISPERSIONS
ELECTRODES
ELEMENTS
FILMS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
IRON COMPOUNDS
KINETICS
MEASURING INSTRUMENTS
METALS
MIXTURES
OXYGEN COMPOUNDS
REACTION KINETICS
SODIUM COMPOUNDS
SULFATES
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
360105* - Metals & Alloys- Corrosion & Erosion
400400 - Electrochemistry
400201 - Chemical & Physicochemical Properties