A technique for determination of cathodic activity during corrosion of a metal matrix composite

Hall, I W; Bao, L

doi:10.1016/1359-6462(95)00631-1

Title: A technique for determination of cathodic activity during corrosion of a metal matrix composite

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Abstract

During the aqueous corrosion of aluminum in the presence of oxygen, Al loses electrons to form Al{sup 3+} ions and the O{sub 2} is reduced and forms (OH){sup {minus}} ions. These reactions occur at local anodic and cathodic sites and it is difficult to determine where the micro-cathode is for several reasons. In this research, Al specimens were immersed in 3.5 wt% NaCl solution containing also 0.5--1 ppm of PdCl{sub 2}. During the corrosion process the Pd{sup 2+} ions gain electrons at the micro-cathodic sites and are deposited there. Pd distribution micrographs can then be easily obtained in the SEM due to the great atomic weight difference between Al and Pd. The Pd distribution micrographs can be used directly to demonstrate the cathodic activity of very fine microstructural features such as precipitates and 0.5 {micro}m diameter SiC whiskers. Results from two aluminum matrix composites are reported. The first is a SiC whisker reinforced 2124 composite (SiC{sub w}/2124), the other is an alumina particulate reinforced 6061 composite (Al{sub 2}O{sub 3}/6061).

Authors:

Hall, I W; Bao, L ^[1]

Univ. of Delaware, Newark, DE (United States). Materials Science Program

Publication Date:: Mon Apr 01 00:00:00 EST 1996

OSTI Identifier:: 205229

Resource Type:: Journal Article

Journal Name:: Scripta Materialia

Additional Journal Information:: Journal Volume: 34; Journal Issue: 7; Other Information: PBD: 1 Apr 1996

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; COMPOSITE MATERIALS; CORROSION; SILICON CARBIDES; ALUMINIUM OXIDES; ALUMINIUM BASE ALLOYS; SODIUM CHLORIDES; AQUEOUS SOLUTIONS; PALLADIUM CHLORIDES; TRACE AMOUNTS; OXYGEN; SCANNING ELECTRON MICROSCOPY; PRECIPITATION; WHISKERS; X-RAY SPECTROSCOPY

Citation Formats


                    Hall, I W, and Bao, L. A technique for determination of cathodic activity during corrosion of a metal matrix composite.  United States: N. p., 1996. 
        Web.  doi:10.1016/1359-6462(95)00631-1.

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                    Hall, I W, & Bao, L. A technique for determination of cathodic activity during corrosion of a metal matrix composite.  United States.  https://doi.org/10.1016/1359-6462(95)00631-1

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                    Hall, I W, and Bao, L. 1996.  
        "A technique for determination of cathodic activity during corrosion of a metal matrix composite".  United States.  https://doi.org/10.1016/1359-6462(95)00631-1.

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@article{osti_205229,

  title        = {A technique for determination of cathodic activity during corrosion of a metal matrix composite},

  author       = {Hall, I W and Bao, L},

  abstractNote = {During the aqueous corrosion of aluminum in the presence of oxygen, Al loses electrons to form Al{sup 3+} ions and the O{sub 2} is reduced and forms (OH){sup {minus}} ions. These reactions occur at local anodic and cathodic sites and it is difficult to determine where the micro-cathode is for several reasons. In this research, Al specimens were immersed in 3.5 wt% NaCl solution containing also 0.5--1 ppm of PdCl{sub 2}. During the corrosion process the Pd{sup 2+} ions gain electrons at the micro-cathodic sites and are deposited there. Pd distribution micrographs can then be easily obtained in the SEM due to the great atomic weight difference between Al and Pd. The Pd distribution micrographs can be used directly to demonstrate the cathodic activity of very fine microstructural features such as precipitates and 0.5 {micro}m diameter SiC whiskers. Results from two aluminum matrix composites are reported. The first is a SiC whisker reinforced 2124 composite (SiC{sub w}/2124), the other is an alumina particulate reinforced 6061 composite (Al{sub 2}O{sub 3}/6061).},

  doi          = {10.1016/1359-6462(95)00631-1},

  url          = {https://www.osti.gov/biblio/205229},
  journal      = {Scripta Materialia},
number       = 7,

  volume       = 34,

  place        = {United States},

  year         = {Mon Apr 01 00:00:00 EST 1996},

  month        = {Mon Apr 01 00:00:00 EST 1996}

}

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