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Preparation process for copper-plate electroplated nickel tungsten electroplated layer of continuous-casting crystallizer

A technology for continuous casting crystallizer and preparation process, which is applied in the field of preparation process for electroplating nickel-tungsten coating on copper plate of continuous casting crystallizer, which can solve the problems of pitting, rough coating, unevenness, etc., and achieve improved wear resistance and stable performance , good corrosion resistance

Active Publication Date: 2014-03-05
XIXIA LONGCHENG SPECIAL MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the nickel-tungsten alloy coating is mainly used in molds and some workpieces of internal combustion engines. There is basically no material for the copper plate of the continuous casting mold. Point and other defects

Method used

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  • Preparation process for copper-plate electroplated nickel tungsten electroplated layer of continuous-casting crystallizer
  • Preparation process for copper-plate electroplated nickel tungsten electroplated layer of continuous-casting crystallizer

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Embodiment

[0031] The present invention will be further described from five groups of tests below.

[0032] In the five groups of tests, the composition and thickness of the electroplated nickel-tungsten coating on the copper plates of each continuous casting mold are shown in the table below

[0033]

[0034] The preparation process of the nickel-tungsten alloy electroplating layer on the copper plate of the continuous casting crystallizer includes the following steps: chemical degreasing, sand blasting, electrolytic degreasing, water cleaning, fixing auxiliary tooling, acid activation treatment, electroplating, and then vacuum heat treatment to eliminate the electroplating layer Internal stress, the vacuum heat treatment is at a vacuum degree ≤ 10 -2 Carry out in a Pa vacuum heat treatment furnace, keep the coating at 350-370°C for 2.5-3 hours, and then cool it with argon or nitrogen;

[0035] Component (g / L) 1 2 3 4 5 Nickel sulfamate 50 56 62 69 75 Sodi...

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Abstract

The invention discloses a preparation process for a copper-plate electroplated nickel tungsten electroplated layer of a continuous-casting crystallizer. The electroplated layer contains tungsten with mass percentage being more than or equal to 44 percent, and the thickness of the electroplated layer is 0.2mm to 1.8mm. The electroplated liquid for the preparation process consists of the following ingredients: 50g / L to 75g / L nickel aminosulfonate, 60g / L to 90g / L sodium tungstate, 55g / L to 120g / L sodium citrate, 1g / L to 4.7g / L saccharin sodium, 0.5g / L to 3g / L sodium allysulfonate and 0.2g / L to 1g / L lauryl sodium sulfate, the current density is 0.5A / dm<2> to 10A / dm<2>, the pH value is 6.5 to 8.0 at the temperature of 55 to 75 DEG C, and the electroplated layer is thermally preserved for 2.5h to 3h in a vacuum heat treatment furnace after the electroplating under the temperature of 350 to 370 DEG C. The electroplated layer is good in heat cracking resistance, oxidation resistance and corrosion resistance and high in heat fatigue resistance, the micro-hardness of the electroplated layer under the plating state can reach over 670HV and can reach about 1230HV after the heat treatment, the abrasion resistance is remarkably improved, and the electroplated layer can be widely applied to the continuous casting of a high-speed continuous-casting machine.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of copper plates of continuous casting crystallizers, and in particular relates to a preparation process for electroplating nickel-tungsten coatings on copper plates of continuous casting crystallizers. Background technique [0002] The continuous casting mold is the core equipment of the whole continuous casting production, its quality directly affects the quality of the slab and the operating rate of the continuous casting machine. However, the performance of the mold is developing in the direction of high casting speed, high mechanical strength, good thermal conductivity, high hardness, high wear resistance and corrosion resistance, and the surface of the mold must be treated. [0003] Among the many existing crystallizer surface treatment technologies, electroplating technology is still the one with mature technology, less equipment investment, low production cost and high raw materi...

Claims

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Application Information

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IPC IPC(8): C25D3/56C25D5/50
Inventor 朱书成徐文柱黄国团王显
Owner XIXIA LONGCHENG SPECIAL MATERIALS CO LTD
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