Method for preparing rare earth alloy through sweeping electric potential sedimentation

Abstract

The invention relates to a method for preparing rare earth alloys in an organic solvent by means of a scanning potential deposition method. Use dimethyl sulfoxide or dimethyl formamide as solvent, rare earth nitrate and iron series chloride as the main salt, tartaric acid or citric acid as complexing agent, mix the main salt and complexing agent with the solvent according to the following concentration ratio Prepared into plating solution: rare earth nitrate 15~50.7g・L -1 , iron chloride 6~20g・L -1 , complexing agent 10~25g・L -1 ;Place the pretreated metal substrate in the above plating solution for plating; scan speed 2~100mV・s -1 , The operating temperature is controlled at 18-35°C, and the plating time is 10-35 minutes. The rare earth alloy film obtained by the method is uniform, dense and has good adhesion; compared with the constant potential and constant current scanning potential deposition method, the appearance and performance of the film are obviously improved. EDAX, SEM, X-ray diffraction and other techniques were used to characterize the rare earth alloy film, and it was found that the amorphous alloy film obtained by electrodeposition turned into a crystalline state after high temperature crystallization, and the average particle size was calculated to reach the nanometer level.

Description

technical field [0001] The invention relates to a method for preparing rare earth alloys in an organic solvent by means of a scanning potential deposition method. Background technique [0002] The metal alloy film can be widely used in hydrogen storage alloys, magneto-optical recording media and magnetostrictive materials. At present, the electrochemical preparation methods of these alloy films are mainly constant potential, constant current and pulse electrodeposition. The electrode reaction is controlled by the ion diffusion rate in the bulk solution when the constant potential method and the constant current method are used for deposition, so the alloy film produced in this way is often rough and has poor adhesion; the pulse electrodeposition has the disadvantage of low efficiency. [0003] Due to the relatively negative reduction potential of rare earths, the precipitation of hydrogen is prone to occur during the electrodeposition of rare earth-iron group alloys in aque...

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Problems solved by technology

When using the constant potential method and constant current method to deposit, the electrode reaction is controlled by the ion diffusion rate in the bulk solution, so the alloy film produced in this way is often rough and has poor adhesion; the use of pulse electrodeposition has the disadvantage of low efficiency.

[0003] Due to the relatively negative reduction potential of rare earths, the precipitation of hydrogen is prone to occur during the electrodeposition of rare earth-iron group alloys in aqueous solution, resulting in poor performance of the alloy film or failure to precipitate on the substrate. Even adding an appropriate complexing agent cannot fundamentally overcome this problem. These disadvantages

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