Zairyo-to-Kankyo
Online ISSN : 1881-9664
Print ISSN : 0917-0480
ISSN-L : 0917-0480
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Stress Corrosion Cracking Test for Pure Copper Tube Using C-Ring Specimen under Ammoniacal Environment
Masahiro SakaiMitsuki KiyaTomoyoshi IrieHiroshi Yakuwa
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2016 Volume 65 Issue 12 Pages 494-497

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Abstract

A 3-week exposure test of the C-ring specimen sampled from a commercial phosphorous deoxidized copper tube in ammoniacal environment were carried out to investigate stress corrosion cracking of a pure copper tube. C-ring specimens were applied high and low stresses; a high stress was over a proof stress, whereas a low stress was within an elastic region. Stress corrosion cracking occurred in the highly stressed C-ring specimen after the 3-week exposure test in gas-phase ammonia derived from 3 and 9wt% ammonia water. On the other hand, intergranular corrosion was observed in the C-ring specimens under low stress. A diameter recovery rate of C-ring specimen for which stress corrosion cracking developed was smaller than that of C-ring specimen without stress corrosion cracking.

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© 2016 Japan Society of Corrosion Engineering
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