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The use of electrochemical noise, acoustic emission and complementary measuring techniques for detection and characterization of intergranular SCC = Uporaba elektrokemijskega šuma, akustične emisije in komplementarnih metod za zaznavanje in karakterizacijo interkristalnega NKP
Kovač, Jaka, 1981- ; Govekar, Edvard ; Legat, Andraž
Stress-corrosion cracking (SCC) is one of the most dangerous corrosion processes as it can cause unexpected failure of vital construction elements. Various SCC mechanisms have been proposed in the ...past few decades, but despite good agreement of these models with specific parameters obtained in selected corrosion systems the exact pattern of individual dissolution events and cracking steps has not been yet determined. Tensile specimens, made from thermally sensitized austenitic stainless steel type AISI 304, were constantly loaded and exposed to the aqueous solution of sodium thiosulphate. Intergranular SCC process was monitored simultaneously by means of three different techniques: electrochemical noise, acoustic emission and elongation measurements. In order to follow the development of stress-corrosion cracks, asection of specimen, where cracks were expected, was monitored by the digital imaging system. It was observed that electrochemical noise and elongation are associated with crack propagation from the early stages of crack initiation, whereas acoustic emission is only associated with the final stages of fracture. Correlations among the signals from the different techniques were also observed. An attempt to relate certain characteristics of the measured signals of electrochemical noise, acoustic emission, and elongation with the SCC process, particularly with the individual events, was also successfully accomplished.
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