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Method for modifying metal nickel surface through molten salt Ni-Yb-plated alloy layer

A technology of metal nickel and alloy layer, which is applied in the field of metal nickel surface modification, can solve the problems of high production cost, restricted development, low production capacity, etc., and achieve the effect of improving surface machinery and solving output

Active Publication Date: 2018-03-30
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since metal Yb mainly reduces Yb through metal La in vacuum 2 o 3 Obtained, this process has low production capacity, complicated equipment, discontinuous operation, high energy consumption and high production cost, which restricts its development
Therefore, the cost of forming a Ni-Yb alloy coating on the surface of nickel metal by vacuum evaporation of pure metal Yb will further increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: the CaF 2 , LiF (molar ratio CaF 2 :LiF=1:1) mixed thoroughly, melted at a temperature of 850°C under nitrogen protection, with a tungsten electrode as the cathode and a glassy carbon electrode as the anode, with a voltage of 0.6V and a current density of 0.2A / cm 2 Under the condition of pre-electrolysis for 0.5h; then, the melt was stirred with high-purity nitrogen gas twice the volume of the molten salt, and then kept at a vacuum of 500Pa and a temperature of 800°C for 1h to remove scum on the surface of the melt. In purified CaF 2 - LiF base medium (molar ratio CaF 2 : LiF=1:1, mass percentage is 97%) in the melt, add Yb 2 o 3 -NiO mixed powder (Yb 2 o 3 :NiO=1:4, molar ratio), argon protection, temperature 900°C, voltage 3.5V, current density 0.7A / cm 2 1. The cathode is a metal nickel substrate, and the anode is high-purity graphite. After 2.5 hours of electroplating, the cathode is cooled to room temperature (25° C.) in argon. After electropla...

Embodiment 2

[0020] Embodiment 2: the CaF 2 , LiF (molar ratio CaF 2 :LiF=1:1) mixed thoroughly, melted at a temperature of 870°C under nitrogen protection, with a tungsten electrode as the cathode and a glassy carbon electrode as the anode, with a voltage of 0.9V and a current density of 0.3A / cm 2 Under the condition of pre-electrolysis for 0.7h; then, the melt was stirred with high-purity nitrogen gas 3 times the volume of the molten salt, and then kept at a vacuum of 400Pa and a temperature of 800°C for 1h to remove scum on the surface of the melt. In purified CaF 2 - LiF base medium (molar ratio CaF 2 : LiF=1:1, mass percentage is 96%) in the melt, add Yb 2 o 3 -NiO mixed powder (Yb 2 o 3 :NiO=1:4, molar ratio), argon protection, temperature 920°C, voltage 3.7V, current density 0.8A / cm 2 1. The cathode is a metal nickel substrate, and the anode is high-purity graphite. After 3 hours of electroplating, the cathode is cooled to room temperature in argon. After electroplating, the...

Embodiment 3

[0021] Embodiment 3: the CaF 2 , LiF (molar ratio CaF 2 :LiF=1:1) mixed thoroughly, melted at 880°C under nitrogen protection, with tungsten electrode as cathode, glassy carbon electrode as anode, voltage 1.0V, current density 0.4A / cm 2 Under the condition of pre-electrolysis for 0.8h; then, pass 4 times the volume of molten salt into the high-purity nitrogen to stir the melt, and then keep it at a vacuum of 300Pa and a temperature of 800°C for 1h to remove the scum on the surface of the melt. In purified CaF 2 - LiF base medium (molar ratio CaF 2 : LiF=1:1, mass percentage is 96%) in the melt, add Yb 2 o 3 -NiO mixed powder (Yb 2 o 3 :NiO=1:4, molar ratio), argon protection, temperature 940°C, voltage 3.8V, current density 0.8A / cm 2 1. The cathode is a metal nickel substrate, and the anode is high-purity graphite. After the electroplating time is 3.0h, the cathode is cooled to room temperature in argon. After electroplating, the surface of the nickel cathode is treate...

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Abstract

The invention relates to a metal nickel surface modification technology, in particular to a method for modifying a metal nickel surface through a molten salt Ni-Yb-plated alloy layer. The method includes the following steps that firstly, raw materials are proportioned; secondly, anhydrous CaF2-LiF basic electrolyte is purified; thirdly, molten salt electroplating is carried out; fourthly, surfacetreatment is conducted. A molten salt electrochemical method is used for directly depositing a Ni-Yb alloy plated layer on the metal nickel surface with an oxide raw material (Yb2O3 and NiO), the problems about yield, energy consumption and cost can be well solved, and the method is environmentally friendly. The Ni-Yb alloy plated layer with the thickness of 0.5-2 mm is formed on the metal nickelsurface by controlling electroplating technology parameters, so that mechanical, electric and magnetic properties and other comprehensive performance of the surface are remarkably improved.

Description

technical field [0001] The invention relates to a metal nickel surface modification technology, in particular to a method for modifying the metal nickel surface by plating a Ni-Yb alloy layer with molten salt. Background technique [0002] Yb is a relatively abundant heavy rare earth element (crust abundance 3.3ppm), but its application fields are mostly limited to its optical properties. In recent years, many studies have shown that Yb has a very broad application prospect in the field of non-ferrous metal alloy structure and functional materials. In particular, it should be pointed out that adding heavy rare earth elements such as Yb to nickel and its alloys can significantly improve the electrical, magnetic or mechanical properties of the alloy. Performance, with unique modification and toughening effects, can have a special effect on the magnetic properties of nickel alloys. Of course, in many fields, the surface properties of nickel metal are required to be very superi...

Claims

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Application Information

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IPC IPC(8): C25D3/66
CPCC25D3/66
Inventor 王旭王瑞祥廖春发焦芸芬
Owner JIANGXI UNIV OF SCI & TECH