Effect of ferrite on corrosion of Fe-Mn-Al alloys in sodium chloride solution

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Corrosion

DOI:https://doi.org/10.5006/1.3293550· OSTI ID:131405

Ruscak, M; Perng, T P ^[1]

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1. National Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Materials Science and Engineering

The corrosion behaviors of five Fe-Mn-Al (Femnal) alloys with ferrite contents varying from 0.5% to 98% were studied in 3.5% sodium chloride (NaCl) at room temperature. Potentiodynamic polarization tests and immersion tests were performed. In deaerated solution, the corrosion potentials (E{sub corr}) of these alloys were very close. The passive current (i{sub p}) increased and the width of the passive region decreased as the ferrite content increased. However, the nearly ferritic alloy showed much better passivation behavior, presumably because of the addition of 6.23% Cr. In aerated solution, either no passive region or a very small passive region was observed. From the immersion test, general corrosion was found to be minor. Pitting was the primary corrosion form, except for the ferritic alloy. The pits were found more frequently in the ferrite phase or at the interface between the ferrite and austenite phases.

• Sponsoring Organization: USDOE
• OSTI ID: 131405
• Journal Information: Corrosion, Journal Name: Corrosion Journal Issue: 10 Vol. 51; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
AUSTENITE
CHROMIUM ALLOYS
CORROSION
ELECTRIC POTENTIAL
FERRITE
INTERFACES
IRON ALLOYS
MANGANESE ALLOYS
MATERIALS TESTING
MICROSTRUCTURE
PASSIVATION
PITTING CORROSION
SODIUM CHLORIDES