Formation conditions, chloride content, and stability of passive films on an iron-chromium alloy

Journal Article · Thu Jul 01 04:00:00 EDT 1993 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2220735· OSTI ID:6098505

Hubschmid, C; Landolt, D ^[1]

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1. Ecole Polytechnique Federale de Lausanne (Switzerland). Dept. des Materiaux

Passive films were formed on a high purity Fe-23 Cr alloy in acid sulfate solutions in the presence and absence of chloride ion. The resulting film composition was investigated by Auger depth profiling. The passivated samples were exposed to a 1M NaCl solution at a constant potential slightly above the critical pitting potential, and the current-time transient was measured in order to compare the relative stability of the different films. The results obtained suggest that the formation conditions influence the chloride content of the passive film and the breakdown behavior. Passive films formed in the presence of chloride contain and are slightly less stable towards breakdown. No chloride was found in films formed in sulfate and subsequently exposed to chloride well below the pitting potential.

• OSTI ID: 6098505
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:7; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALLOYS
AUGER ELECTRON SPECTROSCOPY
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CORROSION
CORROSION PRODUCTS
CORROSION RESISTANCE
ELECTRIC POTENTIAL
ELECTRON SPECTROSCOPY
FILMS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IRON ALLOYS
IRON BASE ALLOYS
OXYGEN COMPOUNDS
PASSIVATION
PITTING CORROSION
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM SULFATES
SPECTROSCOPY
STABILITY
SULFATES
SULFUR COMPOUNDS
SULFURIC ACID