Method for low temperature aqueous solution electrochemical codeposition of nickel iridium alloy

An electrochemical and aqueous solution technology, applied in the field of nickel-iridium alloy preparation, can solve the problems of poor nickel-iridium alloy purity, influence on catalytic effect, etc., and achieve the effects of low cost, controllable alloy thickness and composition, and simple process

Active Publication Date: 2015-05-13
CHANGZHOU UNIV
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Problems solved by technology

The wet impregnation process is simple to operate, but requires high temperature decomposition, and the purity of the nickel-iridium alloy obtained is poor, which affects the catalytic effect

Method used

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  • Method for low temperature aqueous solution electrochemical codeposition of nickel iridium alloy

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Embodiment 1

[0022] Such as figure 1 As shown, 1 is the nickel-iridium coating, and 2 is the base material of the workpiece. First configure 100mL electroplating solution iridium trichloride 0.01mol / L, nickel sulfate 0.005mol / L, nickel sulfamate 0.02mol / L, citric acid 0.350mol / L, saccharin 0.010mol / L, and import the weighed medicines 100mL glass container. First add about 70mL of deionized water to stir and dissolve; then add sodium hydroxide solution dropwise to adjust the pH to around 4.0, then add deionized water to 90mL, use a pH meter to measure the pH value of the plating solution, and then add a small amount of Sodium hydroxide was used to fine-tune the pH to 5.0. Use copper workpiece 2 as the substrate, first perform surface polishing and detergent cleaning, then perform nitric acid cleaning for 1 min, and then perform ultrasonic cleaning with acetone. The reference electrode is Ag / AgCl / saturated KCl, the anode is platinum, and the temperature of the water bath is adjusted to 70...

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Abstract

The invention relates to a method for low temperature aqueous solution electrochemical codeposition of nickel iridium alloy, and the method is characterized in that: nickel salts comprise 0.001-0.1mol / L of nickel sulfate, 0.035-0.05mol / L of nickel chloride and 0.005-0.5mol / L of nickel sulfamate, iridium salt is 0.005-0.1mol / L of trichloride iridium containing water crystal, the complex is 0.1-0.5mol / L of citric acid, additives comprise 0.001-0.01mol / L of saccharin, 0.0005-0.01mol / L of gelatin, 0.0001-0.005mol / L of lauryl sodium sulfate, 0.0001-0.005mol / L of naphthyldisulfnate, 0.0001-0.005mol / L of coumarin and 0.0001-0.005mol / L of paratoluene sulfonamide, and the nickel salts, the iridium salt, the complex and the additives are dissolved in deionized water; the plating solution pH is 2-12, deposition temperature is 25-90 DEG C, the current density is 20-100mA / cm<2>, agitation and nitrogen protection are needed in the deposition process, stirring speed of a stirrer is 10-1000 rpm, electrochemical codeposition of nickel iridium alloy can be performed on the surface of an electrode of a pretreated workpiece, and nickel iridium alloy having the advantages of homogeneous composition, fine crystalline grains, good bonding and excellent corrosion resistance can be obtained, the iridium content is 0.1-50at%, and the alloy thickness is 0.1 to 100 mu m.

Description

technical field [0001] The invention relates to a method for preparing a nickel-iridium alloy, in particular to a method for electrochemically co-depositing a nickel-iridium alloy in a low-temperature aqueous solution. Background technique [0002] Pure nickel has good processing performance and good corrosion resistance, and is mainly used in chemical industry, medical treatment, electronics, currency, food, radio, machinery manufacturing, textile, etc. Nickel has good mechanical, physical and chemical properties, adding appropriate elements can improve its oxidation resistance, corrosion resistance and high temperature strength. Nickel alloys can be used as materials for electron tubes, precision alloys, nickel-based superalloys, nickel-based corrosion-resistant alloys, shape memory alloys and catalysts. It is widely used in new energy development, chemical industry, electronics, navigation, aviation and aerospace. Electrochemically deposited nickel alloys have the chara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56
CPCC25D3/562
Inventor 吴王平丁建宁江鹏刘平
Owner CHANGZHOU UNIV
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