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Crystallizer copper tube with transitional chromium coating and hard chromium coating and production process thereof

A chrome plating and copper tube technology is applied in the field of production technology of copper tubes of crystallizers, which can solve the problems of low production efficiency, large differences in physical properties, and peeling off of the coating, so as to improve the qualification rate and production efficiency, and enhance the anti-shedding performance. , the effect of improving the service life

Inactive Publication Date: 2006-07-19
张喜成 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mold copper tube whose inner wall is plated with hard chromium is prone to coating peeling off during the continuous casting production process, thereby shortening the service life of the mold copper tube
The reason is that there is a large difference in physical properties between the copper substrate and the hard chrome coating, especially their thermal expansion coefficient and hardness, which make it difficult to adapt to the temperature environment changes in the continuous casting production process
For this reason, adopt in the prior art to coat one deck nickel-cobalt alloy or nickel-iron alloy transition layer between copper substrate and wear-resistant hard chrome coating, this transition layer is beneficial to preventing hard chrome coating from coming off, but has The crystallizer copper tube with this coating needs to be electroplated twice in two plating tanks during the production process. The production process is complicated, the production efficiency is low, and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mold copper tubes with transition chromium plating and hard chromium plating are produced according to the following process steps:

[0016] (1) Derusting and degreasing treatment:

[0017] Take the base copper tube for mechanical polishing and derusting, then put it into a degreasing tank containing a neutral oil agent, degrease at a temperature of 50-60°C, take it out after degreasing and wash it with running water, and then put it into a degreasing tank containing 20% Pickle in sulfuric acid pickling tank for 3 to 5 minutes, take it out and rinse with running water;

[0018] (2) Anti-engraving processing:

[0019] Carry out anti-etching treatment on the base copper tube after derusting and degreasing. The composition of anti-etching solution is: chromic anhydride 125g / L, sulfuric acid 1.0g / L, amine corrosion inhibitor 150ml / L; the process conditions of anti-etching treatment For: temperature 45°C, current density 30A / dm 2 , time 2min;

[0020] (3) Prepare electro...

Embodiment 2

[0027] The process step of producing the crystallizer copper tube with transitional chromium coating and hard chromium coating is identical with embodiment 1, and difference is that the plating process condition is:

[0028] Current density: 20A / dm 2

[0029] Plating temperature: Start plating at 65°C, keep warm for 30 minutes, then lower the temperature of the plating solution to 45°C and keep warm within 30 minutes to continue plating;

[0030] Plating time: a total of 4h.

Embodiment 1 example 3

[0032] The process step of producing the crystallizer copper tube with transitional chromium coating and hard chromium coating is identical with embodiment 1, and difference is that processing condition is:

[0033] Plating temperature: Start plating at 75°C, keep warm for 30 minutes, cool the plating solution to 55°C within 1 hour and keep warm to continue plating;

[0034] Current density: 35A / dm during plating at 75°C, during heat preservation and during cooling of the plating solution from 75°C to 55°C 2 , the current density is 30A / dm during the insulation plating at 55℃ 2 ;

[0035] Plating time: a total of 3h.

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Abstract

The manufacture technique for a crystallized copper tube with transient Cr-plating layer and hard Cr-plating layer comprises: cleaning the base copper tube to remove dust and oil; reverse nicking treatment before plating; preparing electroplate liquid; plating; cleaning; then, arranging transient plating layer with medium thermal-expansion coefficient and hardness between the base tube inner wall and surface hard plating layer. This invention ensures the tube resistance to high temperature, wear and corrosion, and endows the plating layer resistance peel, and has high yield efficiency with stable quality and low cost.

Description

technical field [0001] The present invention relates to mold copper tubes with chromium plating. The invention also relates to a process for producing mold copper tubes with chromium plating. Background technique [0002] The mold is an important part of the continuous casting machine in the smelter, and the mold copper tube is an important part of the mold. Since the high-temperature molten steel flows directly through the mold copper tube, in order to stabilize the continuous casting process and ensure the safety of equipment and operators, the mold copper tube is required to have good high temperature resistance, wear resistance and corrosion resistance. The crystallizer copper tube with hard chromium plating is produced by chrome plating on the inner wall of the copper tube, because the high temperature resistance, wear resistance and corrosion resistance of the mold copper tube can be greatly improved, and the production process is simple, high in efficiency and low in...

Claims

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Application Information

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IPC IPC(8): C25D5/14C25D3/04B22D11/059
Inventor 张喜成王秀波范维东张军哲梁立萍朱岩
Owner 张喜成
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