Localized Corrosion of Iron in Alkaline Sulfide Solutions: Iron Sulfide Formation and the Breakdown of Passivity

1986 ◽  
Vol 133 (3) ◽  
pp. 461-467 ◽  
Author(s):  
J. Vera ◽  
S. Kapusta ◽  
N. Hackerman
Keyword(s):  
Iron Sulfide ◽  
Localized Corrosion ◽  
Corrosion Of Iron ◽  
Alkaline Sulfide

Application of AC resistmetry to monitoring of localized corrosion of iron

2002 ◽  
Vol 44 (6) ◽  
pp. 1329-1341 ◽  
Author(s):  
Kazuhisa Azumi ◽  
Kei Iokibe ◽  
Tomohiro Ueno ◽  
Masahiro Seo
Keyword(s):  
Localized Corrosion ◽  
Corrosion Of Iron

Effect of nitrate and chromate on the localized corrosion of iron and nickel

1981 ◽  
Vol 46 (11) ◽  
pp. 2834-2841 ◽  
Author(s):  
Jaromír Toušek
Keyword(s):  
Activation Energy ◽  
Corrosion Rate ◽  
Competitive Adsorption ◽  
Localized Corrosion ◽  
Favourable Effect ◽  
Water Molecules ◽  
Metal Dissolution ◽  
Breakdown Potential ◽  
Passivation Potential ◽  
Corrosion Of Iron

The combined effect of some inorganic inhibitors - chromate and nitrate - on the rate of localized corrosion of iron and nickel was investigated. The efficiency of these inhibitors and the mechanism of their effect were found to depend on the potential. If the breakdown potential is lower than the second passivation potential, the corrosion rate decreases owing to the competitive adsorption of inhibitor and of aggresive ions and owing to a change in the activation energy of the metal dissolution. Substances that are strongly adsorbed on the electrode act in this region as strong inhibitors. In the range of the second passivation potential there operates another mechanism consisting in a favourable effect of the water molecules in the inhibitor hydration sphere on the rate of the passivation reaction. In this range, even such substances that are only weakly adsorbed on the electrode can act as strong inhibitors.

Corrosion of Iron in an H2S-CO2-H2O System: Some Factors Affecting Hydrogen Penetration Rate Through 8640 Steel

CORROSION ◽  
1965 ◽  
Vol 21 (2) ◽  
pp. 48-52 ◽  
Author(s):  
W. F. BRICKELL ◽  
E. C GRECO ◽  
J. B. SARDISCO
Keyword(s):  
Hydrogen Sulfide ◽  
Iron Sulfide ◽  
Penetration Rate ◽  
Martensitic Structure ◽  
Factors Affecting ◽  
Sulfide Film ◽  
Hydrogen Penetration ◽  
Corrosion Of Iron

Abstract The rate of hydrogen penetration through 8640 steel exposed to an H2S-CO2-H2O environment was shown to depend on concentration of the hydrogen sulfide, structure of the steel and condition of the surface through which the emerging hydrogen passed. Greater penetration rate resulted from an increase in corrodent concentration and from a decrease in martensitic structure. Surfaces coated with iron sulfide film were found to retard penetration by hydrogen to a significantly greater extent than mechanically prepared surfaces.

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