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A kind of electrochemical polishing method of palladium and its alloy

An electrochemical and palladium alloy technology, applied in the field of electrochemical treatment of metal surfaces, can solve problems such as scratches on deformed layers, low hardness of alloys, and scratches on the surface, so as to reduce waste liquid discharge, consume less raw materials, and have little environmental impact Effect

Active Publication Date: 2017-01-04
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the polishing of palladium and its alloys is mainly mechanical polishing; but because the hardness of such alloys is generally very low, it is easy to produce deformation layers and scratches
Generally, after mechanical grinding and polishing, it is necessary to use an acid etchant containing chromic anhydride to remove the scratches on the surface of the sample to obtain a relatively smooth surface, but the process is more complicated, and the surface obtained after treatment will still have small scratches. there are still defects

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  • A kind of electrochemical polishing method of palladium and its alloy
  • A kind of electrochemical polishing method of palladium and its alloy

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Effect test

Embodiment 1

[0019] The electrochemical polishing method of this palladium, its concrete steps are as follows: at first take palladium as anode, carbon rod is cathode, with the organic acid that is 40% by mass percentage, the oxidizing acid of 10%, the organic alcohol of 10%, 1% The homogeneous mixed liquid composed of surfactant and the balance of water is the electrolyte, and the temperature of the electrolyte is 15°C, and the voltage is 10V. Polishing for 5 minutes, the palladium after electrochemical polishing can be taken out and cleaned to obtain a smoother surface. Ideal palladium, the surface topography of the metal before and after polishing is as follows figure 1 , 2 shown.

[0020] Wherein the organic acid is acetic acid; the oxidizing acid is perchloric acid; the organic alcohol is glycerol; the surfactant is nonylphenol polyoxyethylene ether; the power supply for controlling the voltage is a DC power supply; the above reagents are all analytically pure.

Embodiment 2

[0022] The electrochemical polishing method of this palladium-silver-copper alloy, its specific steps are as follows: first, take the palladium-silver-copper alloy (the mass percentage content of Pd is 35%) as the anode, the carbon rod as the cathode, and the organic acid with 60% by mass percentage , 5% of oxidizing acid, 10% of organic alcohol, 0.001% of surfactant and the balance of water are uniformly mixed liquid as electrolyte, and the temperature of the electrolyte is 30 ℃, and the voltage is 50V. Polishing 60min, The palladium-silver-copper alloy with an ideal surface can be obtained after the electrochemically polished palladium-silver-copper alloy is taken out and cleaned.

[0023] Among them, the organic acid is a mixed acid of formic acid and propionic acid with a volume ratio of 1:1; the oxidizing acid is nitric acid; the organic alcohol is a mixed alcohol of ethylene glycol, polyethylene glycol and polyvinyl alcohol with a volume ratio of 1:1:1; surface active Th...

Embodiment 3

[0025] The electrochemical polishing method of the palladium-silver-zinc alloy, its specific steps are as follows: first, the palladium-silver-zinc alloy (the mass percent content of Pd is 35%) is used as the anode, the carbon rod is the cathode, and the organic acid with a mass percent of 50% , 10% of oxidizing acid, 20% of organic alcohol, 0.01% of surfactant and the balance of water are uniformly mixed liquid as the electrolyte, and the temperature of the electrolyte is 15°C, and the voltage is 2V. Polishing for 40min, The palladium-silver-zinc alloy with an ideal surface can be obtained after the electrochemically polished palladium-silver-zinc alloy is taken out and cleaned.

[0026] Among them, the organic acid is oxalic acid; the oxidizing acid is a mixed acid of perchloric acid and nitric acid with a volume ratio of 1:1; the organic alcohol is polyvinyl alcohol; A mixture of oxyethylene ether and block polyoxyethylene-polyoxypropylene ether; the power supply for contro...

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Abstract

The invention relates to an electrochemical polishing method of palladium and an alloy thereof, belonging to the technical field of metal surface electrochemical treatment. The electrochemical polishing method comprises the following steps: firstly, polishing for 2 minutes-60 minutes under conditions with electrolyte temperature of 0 DEG C-30 DEG C and voltage of 2V-50V by using palladium or the palladium alloy as an anode, using a carbon rod as a cathode and using a uniformly mixed liquid consisting of organic acid, oxidizing acid, organic alcohol, a surfactant and the balance of water as electrolyte; and then, taking out and cleaning the electrochemically-polished palladium or palladium alloy to obtain the palladium or palladium alloy with a more ideal surface. The electrochemical polishing method of the palladium and the alloy thereof disclosed by the invention adopts commonly-used industrial materials, and a reagent is very low in consumption in a using process; and moreover, different palladium and alloys thereof can be polished by preferably selecting proportion of polishing liquor or adjusting process parameters, so that scratches and pollution generated in a mechanical polishing process are avoided.

Description

technical field [0001] The invention relates to an electrochemical polishing method for palladium and its alloys, belonging to the technical field of metal surface electrochemical treatment. Background technique [0002] Palladium and its alloys have the advantages of easy cold processing, good hydrogen permeability, good corrosion resistance and low temperature coefficient of resistance, and are widely used in the fields of hydrogen purification, electrical contact materials, electrode materials, resistors and dental materials, among which The most widely used is palladium-silver alloy. [0003] The surface treatment of palladium and its alloys has a significant impact on the appearance and contact resistance of the material. The polishing of palladium and its alloys can not only change the roughness of the metal surface, but also enhance its electrical and chemical properties due to the removal of the passivation layer on the surface. performance. At present, the polishi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/22
Inventor 杨长江翟大成张旭沈庆峰蒋国祥
Owner KUNMING UNIV OF SCI & TECH
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