Elemental nickel transition layer of electroplated chromium of crystallizer copper tube

Abstract

The invention discloses an elemental nickel transition layer of electroplated chromium of a crystallizer copper tube. The elemental nickel transition layer is positioned between the crystallizer copper tube and an electroplated chromium layer; the thickness of a plating is about 3-4 [mu]m; the transition layer comprises a nickel-copper metallurgical bonding layer, a pure nickel layer and a nickel-chromium metallurgical bonding layer formed by nickel and chromium, which are formed between nickel and the copper tube; the transition layer is coated on the crystallizer copper tube by electroplating; a plating solution adopted for electroplating comprises the following components: 500-600g / L nickel aminosulfonate, 25-35g / L nickel sulfate and 55-65g / L lauryl sodium sulfate; and electroplating process parameters are as follows: pH of 4-6, a plating solution temperature of about 45-55 DEG C, cathode current density of 4.5-6.5A / dm<2> and immersing time of about 10-20 minutes.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to an elemental nickel transition layer for electroplating chromium on copper tubes of crystallizers. 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 ...

AI Technical Summary

Problems solved by technology

Although this patent application has paid attention to the problem of plating peeling, it has also adopted an appropriate solution, that is, the method of using a transition layer of chrome plating, but the transition layer is still chromium, and it still does not fundamentally solve the two different problems of chromium and copper. The peeling problem caused by the material difference, so its use effect is still not very ideal

[0004] CN1465753A also discloses a method for electroplating the inner surface of a crystallizer, which adopts a nickel-cobalt alloy as a transition layer, although it also solves the problem of material performance differences between chromium and copper, but because it adopts an alloy coating, the composition of the plating solution is complicated, and the electroplating process The requirements are high, and the alloy composition of the alloy coating is not temperature-sensitive, so it is not easy to control the consistency accurately, so there are also defects of inconsistent and unstable coating

[0005] In the prior art, there are also reports on the use of alloys composed of nickel and other metals as the transition layer, but similar to the above-mentioned patents, complex alloy plating solutions need to be configured, the requirements for electroplating process control are high, and the coating is unstable and inconsistent

In the prior art, there is no report that only nickel is used as the transition layer