Abstract
AbstractIn this work, the influence of pulse frequency on the corrosion resistance of Cu–Zn binary alloy has been investigated by using electrochemical workstation, scanning electron microscope and X-ray diffraction. The results have shown that after the electric pulse treatment, the average grain size in the microstructure of high-zinc binary brass decreased and the corrosion resistance increased. The thickness of dezincification layer decreased from 49.8 to 30.8 µm. The diameter of capacitive reactance arc increased from 741.1 to 2898.0 µm. The corrosion potential increased from −0.2719 to −0.2378 V, and the corrosion current density decreased from 6.3147 × 10−6 to 4.6971 × 10−7 A cm−2 by one magnitude order.
Highlights
In this work, the influence of pulse frequency on the corrosion resistance of Cu–Zn binary alloy has been investigated by using electrochemical workstation, scanning electron microscope and X-ray diffraction
1 Introduction corrosion resistance of brass can be improved by the trace elements of Boron and Arsenic
The influence of pulse frequency on the corrosion resistance of Cu–Zn binary alloy has been examined by the method of adjusting the pulse frequency, based on the cluster theory and the existing research results of the solidification process of liquid metal
Summary
Brass alloy (Zn: 52 wt%, Cu bar) was used as the experiment material for the present study. The graphite crucible was preheated to 800°C, and the furnace with silicon carbide rods was heated to 1,150°C. When Cu and Zn were melted, the temperature was held for 5 min. The melt was poured into a permanent mold. After EPT with different pulse frequencies, the residual melt was poured, and the experimental samples were obtained. The graphite electrode was inserted vertically into the alloy melt of 3 cm depth. The electric pulse frequencies were 3, 8 and 15 Hz. The pulse voltage was 500 V, and the treatment time was 30 s. When the samples solidified and cooled, the samples were sealed by epoxy resin for metallography, and corrosion tests were prepared.
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