Abstract
Metal surfaces can be polished effectively and in an environmentally friendly way by virtue of the mechanical and electrochemical interaction between ion-exchange resin particles and the metal substrate. This paper studied this ‘dry’ polishing process and its property effects on 65 brass alloys. Surface morphology analysis revealed that the surface roughness can be reduced by over 71.5% from 0.764 ± 0.031 μm to 0.218 ± 0.080 μm with longer polishing time, and by over 67.1% from 0.764 ± 0.031 μm to 0.252 ± 0.02 μm with higher voltage. XPS and EDS results showed that only a small amount of oxygen species remained on the polished metal surface, while Cu and Zn were apparently present in the metallic state. The decrease in self-corrosion current indicated by the Tafel curves and the increase in the radius of the capacitive reactance circle contained in the Nyquist plots indicate that the surface corrosion resistance of the polished materials has been improved.
Highlights
Copper and its alloys, due to their good corrosion resistance, thermal conductivity, and mechanical properties, are widely used in many industrial and livelihood elds, such as automotive, microelectronic components, and ornaments
Dry electrochemical polishing (DECP) was rst described by Millet in his patents,[11,12] describing a novel polishing medium prepared using the porous properties of ion-exchange resin particles
Paper adjusted to ensure the specimen was completely buried by resin particles, and the required power voltage was set according to requirements, and the rotation rate of the anode electrode was set at 300 rpm
Summary
Due to their good corrosion resistance, thermal conductivity, and mechanical properties, are widely used in many industrial and livelihood elds, such as automotive, microelectronic components, and ornaments. Dry electrochemical polishing (DECP) was rst described by Millet in his patents,[11,12] describing a novel polishing medium prepared using the porous properties of ion-exchange resin particles. Based on the renewable properties of the ion-exchange resin, the resin particles used in DECP can be reused a er a series of cleaning and regeneration processes.[16] DECP is a more cost-effective and environmentally friendly method than conventional electrochemical polishing. DECP has not been widely discussed in the processing and application of copper alloys This investigation focused on the characteristics and properties of 65 brass samples before and a er polishing with DECP. The effects of the polishing voltage and time on the surface roughness and morphology were investigated
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