Eliminating device for rare earth impurity in nickel plating solution

A technology of nickel electroplating solution and rare earth impurities, applied in the direction of electrolysis process, electrolysis components, cells, etc., can solve the problems of inefficiency, equipment, complicated operation, etc., and achieve the effect of stable quality and plating treatment

Active Publication Date: 2014-10-01
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] However, in order to realize this method, complicated procedures are required, which is inefficient and requires specia

Method used

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  • Eliminating device for rare earth impurity in nickel plating solution
  • Eliminating device for rare earth impurity in nickel plating solution
  • Eliminating device for rare earth impurity in nickel plating solution

Examples

Experimental program
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Effect test

experiment example 1

[0098] A plating solution having a composition of 250 g / L of nickel sulfate, 50 g / L of nickel chloride, and 45 g / L of boric acid and pH 4.5 was heated to 50° C., and nickel plating was performed on the surface of the R—Fe—B based sintered magnet. R-Fe-B-based sintered magnets use a variety of magnets whose composition is adjusted within the following ranges according to the required magnetic properties, namely Nd: 15-25mass%, Pr: 4-7mass%, Dy: 0-10mass%, B: 0.6 mass%~1.8mass%, Al: 0.07~1.2mass%, the balance is Fe, Cu and Ga below 3mass%. However, the composition of the magnets used in one batch is the same composition.

[0099] It should be noted that the respective compositions and amounts of rare earth impurities dissolved in the plating solution depend on the combination of magnets used for plating, the treatment method such as barrel plating or rack plating, and the composition of the plating solution. different.

[0100] After several days of plating treatment, the nick...

experiment example 2

[0109] With the composition of nickel sulfate 250g / L, nickel chloride 50g / L, boric acid 45g / L, the plating solution of pH4.5 is heated to 50 ℃, in R-Fe-B base sintered magnet (using the same as embodiment 1 The composition range of magnets) is nickel-plated on the surface. After several days of plating treatment, the Nd impurity in the nickel plating solution was analyzed and found to be 576 ppm.

[0110] The heating temperature is set to 6 conditions from 50°C to 95°C (wherein 50°C to 90°C, there are 5 conditions in increments of 10°C), and the plating solution is taken to 3 liters at each condition in a beaker and heated. Stir with a magnetic stirrer (magnetic stirrer) while heating. Water was added during heating to keep the concentration of the plating solution constant. In addition, a sufficient amount of plating solution for ICP emission analysis was taken at certain time intervals, and the taken plating solution was cooled and filtered with filter paper, and then the...

experiment example 3

[0119] In Experimental Example 1 and Experimental Example 2, the plating solution after heat treatment was cooled and filtered with filter paper, and the deposited precipitate was recovered from the plating solution.

[0120] The precipitate was dried with a constant temperature bath. The properties are powder (solid).

[0121] The precipitates were analyzed using an energy dispersive X-ray analyzer (EDX), as follows:

[0122] Nd: 32.532, Pr: 11.967, Dy: 1.581, Al: 0.402, Ni: 7.986, C: 0.319, O: 45.213 (mass%).

[0123] It was confirmed that the rare earth impurities in the plating solution were precipitated from the plating solution in the form of powder (solid) by heat treatment.

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Abstract

The invention provides an eliminating device for a rare earth impurity in a nickel plating solution. The invention provides a device which can relatively simply and effectively eliminate the rare earth impurity which deposits in a plating solution and causes inferior plating when a rare-earth magnet is plated. The eliminating device comprises the components of: a heating unit, a cooling unit and a separation eliminating unit. The nickel plating solution in which the rare earth impurity is dissolved is heated through the heating unit for making the rare earth impurity become precipitation. Then the cooling unit is utilized for cooling the heated nickel plating solution to a temperature for performing plating treatment. The separation eliminating unit is used for separating and eliminating the precipitation of the rare earth impurity.

Description

technical field [0001] The invention relates to a removal device for removing rare earth impurities in nickel electroplating solution. Background technique [0002] Among rare-earth magnets, especially R-Fe-B-based sintered magnets (R is at least one of rare earth elements including Y and must contain Nd), they are widely used because of their high magnetic properties, but they contain Nd and Fe are very easy to rust. Therefore, in order to improve corrosion resistance, a rust-proof coating is applied to the surface of the magnet. Among them, nickel electroplating has high hardness, and the control of the plating process is easier than electroless plating, so it is also widely used in the above-mentioned base magnet. [0003] In the initial stage of the growth process of the plating film by nickel electroplating, components of the object to be plated may dissolve into the plating solution simultaneously with film formation. [0004] In particular, when the pH of the plati...

Claims

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Application Information

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IPC IPC(8): C25D21/18
Inventor 蒲池政直
Owner HITACHI METALS LTD
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