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Title: Electrochemistry of stress corrosion cracking of brass

Abstract

Stress corrosion cracking (SCC) susceptibility of pure copper and two brass (copper-zinc alloy) compositions (80/20 and 60/39) was studied in several ammoniacal and nonammoniacal aqueous solutions at open circuit potential, applying a constant load technique. The SCC tests, using tensile stress and loop specimens, showed pure copper to be immune in all solutions tested, the ..cap alpha..BETA'-brass (60/39) alloy to be most susceptible to SCC, and the (80/20) alloy to have intermediate SCC susceptibility. The electrochemical tests (corrosion potential and Tafel plots) were utilized to prove the validity of the dissolution mechanism for the SCC propagation in solution with intermediate corrosion rates (approx.0.1 < I/sub cor/ < approx.5 mA/cm/sup 2/). The electrochemical tests were also used to predict the preferential dissolution of zinc (dezincification) in noncomplexing solutions, and the higher dissolution of copper (than that of zinc) in complexing solutions. The formation of intermediate cuprous complexes was detected using a rotating ring disc electrode (RRDE) composed of a brass (80/20) disc and platinum ring, in ammonium chloride-cupric chloride solution. At very low corrosion rates, the stress corrosion cracking (is present) is assumed to operate by the brittle mechanical fracture mechanism in solution where ammonium ions (NH/sub 4//sup +/) can bemore » generated.« less

Authors:
Publication Date:
Research Org.:
Iowa State Univ. of Science and Technology, Ames (USA)
OSTI Identifier:
7241074
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BRASS; CRACKS; STRESS CORROSION; COPPER; ELECTROCHEMISTRY; ZINC; DISSOLUTION; AMMONIA; AQUEOUS SOLUTIONS; ALLOYS; CHEMICAL REACTIONS; CHEMISTRY; COPPER ALLOYS; COPPER BASE ALLOYS; CORROSION; DISPERSIONS; ELEMENTS; HYDRIDES; HYDROGEN COMPOUNDS; METALS; MIXTURES; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; SOLUTIONS; TRANSITION ELEMENTS; ZINC ALLOYS; 360105* - Metals & Alloys- Corrosion & Erosion; 360103 - Metals & Alloys- Mechanical Properties

Citation Formats

Seleet, M M. Electrochemistry of stress corrosion cracking of brass. United States: N. p., 1986. Web.
Seleet, M M. Electrochemistry of stress corrosion cracking of brass. United States.
Seleet, M M. 1986. "Electrochemistry of stress corrosion cracking of brass". United States.
@article{osti_7241074,
title = {Electrochemistry of stress corrosion cracking of brass},
author = {Seleet, M M},
abstractNote = {Stress corrosion cracking (SCC) susceptibility of pure copper and two brass (copper-zinc alloy) compositions (80/20 and 60/39) was studied in several ammoniacal and nonammoniacal aqueous solutions at open circuit potential, applying a constant load technique. The SCC tests, using tensile stress and loop specimens, showed pure copper to be immune in all solutions tested, the ..cap alpha..BETA'-brass (60/39) alloy to be most susceptible to SCC, and the (80/20) alloy to have intermediate SCC susceptibility. The electrochemical tests (corrosion potential and Tafel plots) were utilized to prove the validity of the dissolution mechanism for the SCC propagation in solution with intermediate corrosion rates (approx.0.1 < I/sub cor/ < approx.5 mA/cm/sup 2/). The electrochemical tests were also used to predict the preferential dissolution of zinc (dezincification) in noncomplexing solutions, and the higher dissolution of copper (than that of zinc) in complexing solutions. The formation of intermediate cuprous complexes was detected using a rotating ring disc electrode (RRDE) composed of a brass (80/20) disc and platinum ring, in ammonium chloride-cupric chloride solution. At very low corrosion rates, the stress corrosion cracking (is present) is assumed to operate by the brittle mechanical fracture mechanism in solution where ammonium ions (NH/sub 4//sup +/) can be generated.},
doi = {},
url = {https://www.osti.gov/biblio/7241074}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1986},
month = {Wed Jan 01 00:00:00 EST 1986}
}

Thesis/Dissertation:
Other availability
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