Electroplating method for electrically depositing Ni-Co-B alloy coatings on continuous casting crystallizer copper plates

A continuous casting crystallizer and alloy coating technology, which is applied in the electroplating field of continuous casting crystallizer copper plate electrodeposition Ni-Co-B alloy coating, can solve the problem of coating wear resistance, poor corrosion resistance, complex composition of electroplating solution, and reduction efficiency Low-level problems, to achieve the effect of strong throwing ability, enhanced reduction ability, and improved surface quality

Active Publication Date: 2018-01-19
XIXIA LONGCHENG SPECIAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention has the following disadvantages: the hardness of the Ni-Co-B alloy coating without heat treatment is up to 800HV, which needs to be further improved, and the amine boron compound used has weak reducibility and low reduction efficiency, and the obtained Ni-Co-B The B content in the alloy coating is also low, so it is only suitable to prepare a thinner nickel-cobalt-boron coating, and the coating has poor wear resistance and corrosion resistance
This invention has the following disadvantages: the composition of the electroplating solution for preparing the Ni-Co-B alloy coating in this invention is complex, the hardness of the Ni-Co-B alloy coating is low, and the hardness after heat treatment is only 900HV, which cannot well meet the needs of existing companies. cast demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The electroplating method of the copper plate electrodeposited Ni-Co-B alloy coating of the present embodiment continuous casting crystallizer, concrete steps are as follows:

[0042] Step S1, pretreatment: perform pre-plating pretreatment on the copper plate substrate, including: cleaning and degreasing, mechanical sandblasting and roughening, electrolytic degreasing, ultrasonic degreasing, cathode fixed electroplating profiling tooling, and acid activation treatment to obtain the copper plate substrate to be plated ;

[0043] Step S2, electroplating: inject the electroplating solution into the electroplating tank, adjust the pH of the electroplating solution, heat the electroplating solution to raise the temperature to a set value, then put the substrate of the copper plate to be plated into the electroplating tank as the cathode, and put the anode into the electroplating tank. Put it into the electroplating tank, switch on the power supply, and carry out pulse electr...

Embodiment 2

[0050] The electroplating method of the copper plate electrodeposited Ni-Co-B alloy coating of the present embodiment continuous casting crystallizer, and embodiment 1 difference is:

[0051] The composition of the electroplating solution is: nickel sulfate 150g / L, nickel chloride 20g / L, cobalt sulfate 50g / L, sodium borohydride 4g / L, ethylenediamine 45 / L, buffer 35g / L.

[0052] The pH value of the electroplating solution is 9, and the temperature is 55°C;

[0053] The copper plate substrate is the cathode, the nickel beads are the anode, the on-off ratio of pulse plating is 1:6, and the average current density is 2 A / dm 2 .

[0054] The composition of the Ni-Co-B alloy coating, in terms of mass percentage, is: 49.8% Ni, 45.2% Co and 5% B.

Embodiment 3

[0056] The electroplating method of the copper plate electrodeposited Ni-Co-B alloy coating of the present embodiment continuous casting crystallizer, and embodiment 1 difference is:

[0057] The composition of the electroplating solution is: nickel sulfate 300g / L, nickel chloride 50g / L, cobalt sulfate 5g / L, sodium borohydride 0.5g / L, ethylenediamine 35g / L, buffer 45g / L.

[0058] The pH value of the electroplating solution is 14, and the temperature is 70°C;

[0059] The copper plate substrate is the cathode, the nickel beads are the anode, the on-off ratio of pulse plating is 1:6, and the average current density is 3A / dm 2 .

[0060] The composition of the Ni-Co-B alloy coating, in terms of mass percentage, is: 68..3%Ni, 30.7%Co and 1%B.

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Abstract

The invention discloses an electroplating method for electrically depositing Ni-Co-B alloy coatings on continuous casting crystallizer copper plates and belongs to the technical field of electroplating. An electroplating solution used by the method comprises the following components according to mass concentration: 170-350g/L of nickel salt, 5-50g/L of cobalt salt, 0.5-4g/L of sodium borohydride,20-60g/L of ethylenediamine and 30-50g/L of buffering agents. The Ni-Co-B alloy coatings prepared from the electroplating solution have high throwing power and excellent corrosion resistance performance; the micro hardness of the Ni-Co-B alloy coatings can reach 1000HV.

Description

technical field [0001] The invention belongs to the technical field of electroplating, and in particular relates to an electroplating method for electrodepositing a Ni-Co-B alloy coating on a copper plate of a continuous casting crystallizer. Background technique [0002] The continuous casting machine is the key equipment for steelmaking, and the mold is the core component of the continuous casting machine. Its quality directly affects the quality of the billet and the operating rate of the continuous casting machine. Boiling molten steel and molten mold slag directly contact the surface of the copper plate of the mold to cool it into a slab, accompanied by sliding friction between the inner wall and the slab. The harsh working environment requires better thermal conductivity on the surface of the copper plate of the mold. High mechanical strength, good wear resistance and corrosion resistance. In the process of steelmaking production, molten steel continuously passes thro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56B22D11/057
Inventor 朱书成徐文柱黄国团王显効辉
Owner XIXIA LONGCHENG SPECIAL MATERIALS CO LTD
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