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| AN EXPERIMENTAL TECHNIQUE SIMULATING ELECTROCHEMICAL REACTION AT CRACK TIP |
| Lu Guoqiang Xie Zhigao and Lu Yizhong (Xian Jiaotong University) |
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Abstract In order to understand the phenomenon and mechanism of environ- ment-enhanced crack growth in high strength steels,it is necessary to study the kinetics of electrochemical reactions occurring at the crack tip.In this paper,an experimental technique for simulating the electrochemical reaction at the crack tip of a propagating crackhas been developed.The small fresh surface of a broken notched specimen immersed in an aqueous solution,was used as the anode,and a fully oxidized large specimen of the same material was used as the cathode. The galvanic current transient between the anode and the cathode was measured immediately when the notched specimen was broken.To de- monstrate this new technique,an electrochemical reaction test for 40CrNi steel in 3.5%NaCl aqueous solution was conducted,and the kinetics equation of the reaction was obtained with the analysis of the test results.
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Received: 25 June 1990
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| [1] Alavi,A.;Miller,C.D.and Wei,R.P.,Corrosion,43(4) ,204(1987) |
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