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| THE VARIATION OF POTENTIAL DISTRIBUTION IN THE COURSE OF STRESS CORROSION CRACKING OF α-BRASS IN AMMONIA SOLUTION |
| Qiao Lijie (University of Science and Techology Beijing)(Xiamen University) |
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Abstract An apparatus for measuring the potential distribution on a flat specimen immersed in an electrolyte was used to study stress corrosion cracking of α-brass/ammonia system un- der mode Ⅱ loading.in which the maximum normal stress site at the notch tip is different from that of maximum shear stress.The apparatus was connected with a computer to con- trol a micro-reference electrode(MRE).The MRE scanned a micro-region on a specimen. Potential distribution around the notch tip was measured during strew corrosion cracking, and was displayed in three-dimensions and in isopotential contour by a plotter.The poten- tial varied slightly around the notch region scanned by MRE and the notch could be recog- nized on the equipotential contour map for unstressed specimen.When stress was applied, strained atoms at edge of the notch were much more subject to corrosion than other atoms.As a result,potential peak was formed symmetrically to the notch.The peak be- came unsymmetrical during stress corrosion cracking.Corrosion speed at the site of the maximum normal stress was much higher than at any other point.Therefore,an active path was formed along the direction of the maximum normal stress after a period of time. This indicated that a crack would nucleate.If the specimen was tested continuously,a crack could then be observed. In this system,the site and duration of a crack nucleation could be measured.The role of normal stress and shear stress could be distinguished.
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Received: 25 February 1991
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Cite this article:
Qiao Lijie (University of Science and Techology Beijing)(Xiamen University). THE VARIATION OF POTENTIAL DISTRIBUTION IN THE COURSE OF STRESS CORROSION CRACKING OF α-BRASS IN AMMONIA SOLUTION. J Chin Soc Corr Pro, 1991, 11(1): 67-74.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1991/V11/I1/67
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