| 1. |
- Wallinder, D., et al.
(författare)
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Hydrogen in chromium : influence on corrosion potential and anodic dissolution in neutral NaCl solution
- 2001
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Ingår i: Corrosion Science. - 0010-938X .- 1879-0496. ; 43:7, s. 1267-1281
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Tidskriftsartikel (refereegranskat)abstract
- The influence of hydrogen charging, outgassing, pickling and passivation of mechanically polished chromium was investigated with respect to corrosion potential and anodic dissolution in 0.3 M NaCl solution. Secondary ion mass spectroscopy measurements were used to detect hydrogen after hydrogen charging by means of cathodic polarization. The results show that hydrogen in chromium decreases the corrosion potential and increases the anodic dissolution rate. Passivation in HNO3 and pickling in HNO3 + HF increases the corrosion potential, whereas no significant effect on the anodic dissolution could be observed, probably due to a hydrogen uptake in these surface treatments.
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| 2. |
- Wallinder, D., et al.
(författare)
-
Influence of hydrogen in iron and in two stainless steels on aqueous and gaseous corrosion
- 2002
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Ingår i: Journal of the Electrochemical Society. - : The Electrochemical Society. - 0013-4651 .- 1945-7111. ; 149:9, s. B393-B397
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Tidskriftsartikel (refereegranskat)abstract
- The influence of hydrogen in Fe, 301 stainless steel (SS 301), and Avesta 353MA on corrosion resistance in aqueous solutions was studied. The oxidation kinetics of uncoated and Pt-coated Fe was also investigated in O-2 at 500 and 700degreesC. Electrochemical and weight loss measurements were used to evaluate the corrosion resistance in aqueous solutions, and the high-temperature oxidation rate was determined by measuring the pressure decrease in a closed volume. Observations of a high dissolution rate of Fe and SS 301 in deionized water, as well as a high oxidation rate in O-2, can be explained by an increased metal cation transport in the oxide film induced by hydrogen in the metal. However, hydrogen up to a certain concentration in Avesta 353MA was found to increase the resistance to localized corrosion in chloride solution. Pt coating on Fe was found to decrease the oxidation rate and improve scale adherence. The presented results are discussed in view of recent findings of balanced metal cation and oxygen anion transport in protective metal oxides.
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