Failure analysis of brass portions of dielectric unions
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Abstract
Persistent failures (leakage) were observed in the brass portion of dielectric unions after a relatively short service period. Metallographic examination revealed evidence of severe stress-corrosion cracking within the brass as well as dealloying on the surface. Evaluations using stress calculations and the dynamics of freezing water indicated that the unions were not overtightened during installation, and the water passing through the unions did not freeze. The subject copper alloy was shown to have been insufficient for the intended application due to high susceptibility to corrosion.
Keywords
brass cracking dealloying/dezincification stress-corrosion crackingPreview
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References
- 1.Properties and Selection of Metals, vol. 1, Metals Handbook, 8th ed., American Society for Metals, 1961, p. 963.Google Scholar
- 2.“Strength of Materials,” Machinery’s Handbook, 22nd revised ed., Industrial Press Inc., New York, NY, 1986, p. 327.Google Scholar
- 3.Corrosion, vol. 13, Metals Handbook, 9th. ed., ASM International, 1987, p. 615.Google Scholar
- 4.Metals Handbook Desk Edition, American Society for Metals, 1985, p. 32–24.Google Scholar
- 5.Metallography and Microstructures, vol. 9, Metals Handbook, 9th ed., American Society for Metals, 1985, pp. 409, 412.Google Scholar
- 6.“Dealloying,” Properties and Selection: Nonferrous Alloys and Pure Metals, vol. 2, Metals Handbook, 9th ed., American Society for Metals, 1979, p. 461.Google Scholar
- 7.A. Parthasarathi and N.W. Polan: Metall. Trans. A, 1982, 13, p. 2027.CrossRefGoogle Scholar
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