Properties of the passive films formed on ferritic stainless steels in Cl/sup -/ Solutions
Journal Article
·
· Corrosion (Houston); (United States)
OSTI ID:5054958
The pitting resistance of Fe-Cr and Fe-Cr-Mo alloys has been correlated with characteristics of the passive films analyzed by Auger electron spectroscopy (AES). Increased film protectiveness as a result of increased Cr in the alloy can be directly attributed to Cr enrichment of the film and decreased film thickness. Increased Mo in the alloy or passivation at noble potentials promotes passive film resistance to breakdown, but neither does much to change the macrocharacteristics of the film. Rather, it is suggested that the roles of alloying and/or passivation conditions are related to the susceptibility and distribution of weak points of the film. In solutions in which pitting occurs, chloride is generally not incorporated into the film, suggesting that the role of halides is to interact with weak points of the film at the solution/film interface. At 260/sup 0/C, the films are much thicker and likely to be much more defective in structure than those formed at 80/sup 0/C.
- Research Organization:
- Sandia National Laboratories, Albuquerque, NM
- OSTI ID:
- 5054958
- Journal Information:
- Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 40:10; ISSN CORRA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOY SYSTEMS
ALLOYS
AUGER ELECTRON SPECTROSCOPY
BINARY ALLOY SYSTEMS
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
COATINGS
CORROSION
CORROSION PROTECTION
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
ELECTRON SPECTROSCOPY
FERRITIC STEELS
HALOGEN COMPOUNDS
HIGH TEMPERATURE
IRON ALLOYS
IRON BASE ALLOYS
METALLURGICAL EFFECTS
MOLYBDENUM ALLOYS
PASSIVATION
PITTING CORROSION
PROTECTIVE COATINGS
SPECTROSCOPY
STAINLESS STEELS
STEELS
TERNARY ALLOY SYSTEMS
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOY SYSTEMS
ALLOYS
AUGER ELECTRON SPECTROSCOPY
BINARY ALLOY SYSTEMS
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
COATINGS
CORROSION
CORROSION PROTECTION
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
ELECTRON SPECTROSCOPY
FERRITIC STEELS
HALOGEN COMPOUNDS
HIGH TEMPERATURE
IRON ALLOYS
IRON BASE ALLOYS
METALLURGICAL EFFECTS
MOLYBDENUM ALLOYS
PASSIVATION
PITTING CORROSION
PROTECTIVE COATINGS
SPECTROSCOPY
STAINLESS STEELS
STEELS
TERNARY ALLOY SYSTEMS