Sonochemistry preparation method allowing surface of copper powder to be coated with nickel and phosphorus alloy layer
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A technology of surface coating and sonochemistry, applied in the direction of coating, etc., can solve the problems of complex process, low nickel deposition rate, harsh experimental conditions, etc.
Inactive Publication Date: 2014-03-05
JIANGSU UNIV OF SCI & TECH
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The nickel-plated copper powder prepared by electroless plating has the advantages of uniform dispersion, good coating effect, strong corrosion resistance, compact coating, smooth surface, etc. At present, there are many methods for preparing nickel-coated composite powder. The patents for the preparation method of coated composite powder include: the invention patent with the publication number CN1988973A provides a preparation method for nickel-plated copper powder, which uses palladium as a catalyst and hydrazine (hydrazine) as a reducing agent to prepare nickel-plated copper powder; the document "Technology and Performance Research of Nickel-coated Copper Powder for Electronic Industry" adopts palladium chloride as the activator, and utilizes hydrazine (hydrazine) as the reducing agent to coat a layer of nickel on the copper powder; the publication number is CN1817512A The invention patent provides a production method of nickel-coated copper powder. Under the condition of alkaline plating solution, the nickel sulfate solution is heated to 80-90°C, and electrolytic copper powder is added to adjust the pH to 11.5-13.5. Hydrazine (hydrazine) is used to As a reducing agent, nickel-coated copper powder is prepared; when the above-mentioned documents all use hydrazine (hydrazine) as a reducing agent to prepare nickel-coated copper powder, the deposition rate of nickel in this method is relatively low, the process is complicated, the cost is high, and the environment problems such as pollution; the document "Preparation of New Ni-Cu Composite Coating" introduces the process of preparing nickel-clad copper powder by composite electroplating: copper powder is added to the nickel-plating electrolyte containing nickel sulfate, nickel chlorate and boric acid, Control the pH value of the electrolyte to 3-4, the temperature to 45-60°C, and the current density to 2-3A / dm2 to achieve the purpose of nickel plating on the surface of copper powder, but the experimental conditions are harsh, the cost is high, and the operation is complicated
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[0022] 1) The electronic balance accurately weighs the required chemical reagents: nickel sulfate 60g, sodium hypophosphite 80g, sodium acetate 60g, lactic acid 10g, propionic acid 6g, additive hydrochloric acid (1.18g / cm3), surfactant 0.2g, lead acetate 0.2 mg, the above reagents are all analytically pure; the temperature is 85°C, and the holding time is 5min.
[0023] 2) To prepare a 2L plating solution, first measure half the volume of the required plating solution, dissolve nickel sulfate, sodium acetate, lactic acid and propionic acid in different beakers, and stir the evenly dissolved complexing agent solution Slowly add nickel salt solution, stir evenly, add sodium hypophosphite, stir for 10 minutes, finally add surfactant and lead acetate, constant volume to obtain plating solution.
[0024] 3) Quantitatively weigh 50g of copper powder, after acidification and activation pretreatment, add to the plating solution, stir until the solution is in a suspended state, and adj...
example 2
[0029] 1) The electronic balance accurately weighs the required chemical reagents: nickel sulfate 120g, sodium hypophosphite 160g, sodium acetate 120g, lactic acid 20g, propionic acid 12g, additive hydrochloric acid (1.18g / cm3), surfactant 0.8g, lead acetate 0.4 mg, the above reagents are all analytically pure; the temperature is 85°C, and the holding time is 10min.
[0030] 2) To prepare 4L of plating solution, first measure half the volume of the required plating solution, dissolve nickel sulfate, sodium acetate, lactic acid and propionic acid in different beakers, and stir the evenly dissolved complexing agent solution Slowly add nickel salt solution, stir evenly, then add sodium hypophosphite, stir for 20 minutes, finally add surfactant and lead acetate, constant volume to obtain plating solution.
[0031] 3) Quantitatively weigh 120g of copper powder, after acidification and activation pretreatment, add it to the plating solution, stir until the solution is in a suspended s...
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Abstract
The invention relates to metal-coated composite powder, in particular to a sonochemistry preparation method allowing the surface of copper powder to be coated with a nickel and phosphorus alloy layer. The method is characterized in that high-energy ultrasonic agitation is effectively added into a traditional process of chemical plating, and the cavitation effect, the oscillation effect and other effects of the high-energy ultrasonic agitation are utilized, so that the preparation efficiency of composite copper powder coated with nickel is improved, and the problems of powder accumulating and the like are solved. In addition, when the copper powder coated with the nickel and phosphorus is prepared, sodium hypophosphite is used as a reducing agent of an acidic chemical plating solution, and the plating solution is easy to prepare and high in stability; due to the fact that activating treatment is carried out on the copper powder through hydrochloric acid before plating, the defect that traditionally, when salt activation and sensibilization are carried out on the surface of the copper powder, precious metal palladium salt is brought into the plating solution, so that the plating solution is decomposed is overcome, and also the activation processes of the powder are simplified. Meanwhile, because the high-energy ultrasonic agitation is kept in the whole plating process, the prepared composite powder is excellent in dispersity, the coating layer of the powder is complete and uniform, the plating of the powder is compact, and the powder is in an amorphous state.
Description
technical field [0001] The invention relates to a metal-coated composite powder, in particular to a sonochemical preparation method for coating a phosphorus-nickel alloy layer on the surface of copper powder. Background technique [0002] With the rapid development of modern science and technology, in many fields such as metallurgy, machinery, navigation, electronics, communication, and material protection, it is difficult for a single material to meet some special requirements, so that the research on composite materials has been paid more and more attention and has been rapidly developed. The development of metal-coated composite powder, as a type of composite material, has the characteristics of two or more substances, the cladding metal and the coated powder used as the core, so it has become a popular choice in many of the above-mentioned fields. essential material. [0003] Metal nickel powder and copper powder are widely used materials in metallurgy, machinery, chemi...
Claims
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