Effects of high temperature surface oxides on room temperature aqueous corrosion and environmental embrittlement of iron aluminides

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Studies were conducted to determine the effects of high-temperature surface oxides, produced during thermomechanical processing, heat treatment (750 {degrees}C in air, one hour) or simulated in-service-type oxidation (1000{degrees}C in air, 24 hours) on the room-temperature aqueous-corrosion and environmental-embrittlement characteristics of iron aluminides. Materials evaluated included the Fe{sub 3}Al-based iron aluminides, FA-84, FA-129, FAL and FAL-Mo, a FeAl-based iron aluminide, FA-385, and a disordered low-aluminum Fe-Al alloy, FAPY. Tests were performed in a mild acid-chloride solution to simulate aggressive atmospheric corrosion. Cyclic-anodic-polarization tests were employed to evaluate resistances to localized aqueous corrosion. The high-temperature oxide surfaces consistently produced detrimental results relative ... continued below

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40 p.

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Buchanan, R.A. & Perrin, R.L. September 1, 1996.

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Description

Studies were conducted to determine the effects of high-temperature surface oxides, produced during thermomechanical processing, heat treatment (750 {degrees}C in air, one hour) or simulated in-service-type oxidation (1000{degrees}C in air, 24 hours) on the room-temperature aqueous-corrosion and environmental-embrittlement characteristics of iron aluminides. Materials evaluated included the Fe{sub 3}Al-based iron aluminides, FA-84, FA-129, FAL and FAL-Mo, a FeAl-based iron aluminide, FA-385, and a disordered low-aluminum Fe-Al alloy, FAPY. Tests were performed in a mild acid-chloride solution to simulate aggressive atmospheric corrosion. Cyclic-anodic-polarization tests were employed to evaluate resistances to localized aqueous corrosion. The high-temperature oxide surfaces consistently produced detrimental results relative to mechanically or chemically cleaned surfaces. Specifically, the pitting corrosion resistances were much lower for the as-processed and 750{degrees} C surfaces, relative to the cleaned surfaces, for FA-84, FA-129, FAL-Mo, FA-385 and FAPY. Furthermore, the pitting corrosion resistances were much lower for the 1000{degrees}C surfaces, relative to cleaned surfaces, for FA-129, FAL and FAL-Mo.

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40 p.

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OSTI as DE97050496

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  • Other Information: PBD: Sep 1996

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  • Other: DE97050496
  • Report No.: ORNL/Sub--88-07685CT92/05
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/415344 | External Link
  • Office of Scientific & Technical Information Report Number: 415344
  • Archival Resource Key: ark:/67531/metadc675574

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  • September 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • May 2, 2016, 3:47 p.m.

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Buchanan, R.A. & Perrin, R.L. Effects of high temperature surface oxides on room temperature aqueous corrosion and environmental embrittlement of iron aluminides, report, September 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc675574/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.