Ultrafine zinc alloy powder and preparation method thereof

Abstract

The invention provides a ultrafine zinc alloy powder and a preparation method thereof, wherein the particle size range of the ultrafine zinc alloy powder is 1-100nm. The ultrafine zinc alloy powder comprises light rare earth element lanthanum, cerium and heavy rare earth element gadolinium, wherein the light rare earth element lanthanum, and the cerium and the heavy rare earth element gadolinium can restrain crystal particles to grow on one hand and form a fine crystal particle grain boundary strengthening mechanism, can play the role of degassing and removing impunities on the other hand, thereby reducing damage to alloy. Simultaneously, less nickel, cobalt and stibium are added into the ultrafine zinc alloy powder, can obviously improve anti-corrosion and oxidation resistance. Trace amount of indium, bismuth, aluminum and calcium metal are added into the ultrafine zinc alloy powder, and the alloy performance of the ultrafine zinc alloy powder is enhanced. The ultrafine zinc alloy powder does not comprise poisonous and harmful elements such as mercury, lead and cadmium, can not cause environment pollution and ecological damage, and is green and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal alloy powder materials, and in particular relates to an ultrafine zinc alloy powder and a preparation method thereof, which are mainly used as an additive for paint. Background technique [0002] Zinc powder is an important industrial raw material with great market demand. It is widely used in metallurgy, chemical industry, construction, transportation, medicine, electronics and other fields. The production methods of zinc powder include atomization method and evaporation condensation method. Preparation of zinc powder by atomization methods, such as air jet atomization and hydraulic jet atomization, has low product recovery rate, high power consumption, and problems such as uneven particles. At present, the method of domestic industrialized production of zinc powder is mostly based on the evaporation condensation method, with coal, gas or electricity as the energy source, and the zinc i...

AI Technical Summary

Problems solved by technology

The ultra-fine zinc powder produced by high-energy ball milling is in the shape of scales, but it is easy to pollute

The process proposed in Chinese patents CN1450182A and CN1482263A has promoted the large-scale production of the alkaline electrolytic zinc powder process, but the particle size of the zinc powder produced by this process is relatively large, and the thickness is uneven, and the preparation of ultra-fine zinc powder needs to be ground by a ball mill , high energy consumption, complex process

[0005] However, the technical problem of using pure zinc powder as an additive for coatings is that the corrosion resistance of pure zinc powder can no longer meet the development requirements of coatings, so people gradually try to replace pure zinc powder with zinc alloy powder as a corrosion-resistant coating Additive use

Currently commonly used zinc alloy powders usually use toxic and harmful alloying elements such as mercury and lead. Adding zinc alloy powders using these elements to coatings will cause environmental pollution and ecological damage, and cannot meet the current environmental protection requirements.