NOUFERROUS METALLURGICAL EQUIPMENT

In the study, the vacuum diffusion welding process was used to successfully weld T2 copper and 1060Al. The scanning electron microscope and energy dispersive spectrometer were utilized to analyze the microstructure and phase composition of the diffusion layer. Corrosion immersion tests and research on the electrochemical corrosion performance were carried out in a 3.5wt%NaCl solution to study and compare the corrosion resistance of each diffusion layer and the base materials. The results show that a diffusion layer composed of the AlCu layer, Al₂Cu layer, and Al₄Cu₉ layer was formed at the interface of the T2 copper/1060Al vacuum diffusion joint. The corrosion resistance varied in different regions of the diffusion layer. The corrosion degree in the diffusion layer region on the copper side was relatively mild. In the diffusion layer region on the aluminum side, the pitting holes developed into pitting pits, and with the passage of time, irregular deep gullies were formed, which eventually developed into exfoliation corrosion. In terms of the corrosion resistance, the base materials and each diffusion layer were ranked as follows: T₂Cu ＞ Al₄Cu₉ ＞ AlCu ＞ Al₂Cu ＞ 10₆0Al.