采用丝束电极研究金属的缝隙腐蚀*

采用丝束电极研究了铜在5%NaCl介质中的缝隙腐蚀行为。研究表明，铜发生缝隙腐蚀的过程中，缝隙内金属的腐蚀电位分布是不均匀的，不均匀的程度相差达数十毫伏。在缝隙腐蚀的初期，缝隙内金属腐蚀电位随着缝隙腐蚀的发生逐渐正移。随着缝隙腐蚀程度的加深，缝隙内金属的腐蚀电位发生负移，且逐渐均匀分布。这一过程与经典的金属缝隙腐蚀机理相吻合。

STUDY ON CREVICE CORROSION OF COPPER USING WIRE BEAM ELECTRODE

As a natural extension of our previous work,the novel wire beam electrode was used to study crevice corrosion of copper.As special electrochemical sensor.it remarkably improved the reproducibility of electrochemical measurement.The electrochemical parameters related to crevice corrosion process could be measured directly using wire beam electrode.As non-destructive and simple method,potential measurement had some advantages over other electrochemical testing methods.The crevice corrosion of copper in 5%NaCl solution was studied using a wire beam electrode.It was pointed out that the distribution of corrosion potential in crevice was inhomogeneous.At the early stage of immersion,the corrosion potentials in the crevice shifted towards positive.With propagation of crevice corrosion,the corrosion potentials in crevice began to shift negatively,and became homogeneous gradually.This process was coincident with classic theory of crevice corrosion of metal.