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Author Moffat, T. P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ALUMINIUM BASE ALLOYS ♦ PITTING CORROSION ♦ MANGANESE ALLOYS ♦ CORROSION RESISTANCE ♦ ELECTRODEPOSITED COATINGS ♦ EXPERIMENTAL DATA ♦ MICROSTRUCTURE ♦ SODIUM CHLORIDES ♦ ALKALI METAL COMPOUNDS ♦ ALLOYS ♦ ALUMINIUM ALLOYS ♦ CHEMICAL REACTIONS ♦ CHLORIDES ♦ CHLORINE COMPOUNDS ♦ COATINGS ♦ CORROSION ♦ DATA ♦ HALIDES ♦ HALOGEN COMPOUNDS ♦ INFORMATION ♦ NUMERICAL DATA ♦ SODIUM COMPOUNDS ♦ Metals & Alloys- Corrosion & Erosion
Abstract The corrosion behavior of a series of electrodeposited Al-Mn alloys has been investigated. Three different microstructures were examined. A supersaturated face-centered cubic (fcc) structure was produced with up to 5 atomic percent (a/o) Mn. Deposits containing 5--22 a/o Mn were composed of a glassy phase in combination with a supersaturated (1 a/o Mn) fcc phase, while alloys with 22--26 a/o Mn were single-phase metallic glasses. The pitting characteristics of these materials, in aqueous chloride solutions, were controlled by the alloy microstructure. Relative to aluminum, a 250 to 400 mV increase in the pitting potential was observed for the single-phase Al-Mn alloys. In contrast, the dual-phase material exhibited pitting potentials closer to that of aluminum due to selective pitting of the (1 a/o Mn) fcc phase. The enhanced pitting resistance of single-phase Al-Mn alloys is remarkable in view of the reactive nature of elemental manganese.
ISSN 00134651
Educational Use Research
Learning Resource Type Article
Publisher Date 1993-10-01
Publisher Place United States
Journal Journal of the Electrochemical Society
Volume Number 140
Issue Number 10


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