Method for preparing work layer on surface of process roller of cold rolling unit

Abstract

The invention discloses a method for preparing a work layer on the surface of a process roller of a cold rolling unit, which comprises the thermal spraying of a metal ceramic coating on the surface of the process roller. The method comprises the following steps: firstly, cleaning and activating a thermal spraying coating on the surface of the process roller; secondly, chemically plating a Ni-P layer, wherein chemical plating solution comprises 30g / l of nickel sulfate, 25g / l of sodium hypophosphite, 15ppm of activator, 5g / l of accelerator, 10g / l of lactic acid and 15g / l of citric acid; thirdly, immersing the process roller into the plating solution, wherein the temperature of the plating solution is between 80 and 100 DEG C, the nickel content is 88 to 92 percent, and the phosphorus content is 8 to 12 percent; and finally, when the thickness of the chemical plating layer reaches 0.01 to 0.02mm, stopping the chemical plating, performing thermal treatment at the temperature of between 50 and 450 DEG C, and preserving the heat for 0.5 to 5 hours. The work layer on the surface of the process roller prepared by the method has abrasion resistance, impact resistance, roughness retention capacity and excellent anti-adhesion performance, meets the operating requirement of long term and stability of the process roller, and prolongs the service life of the process roller.

Description

technical field [0001] The invention relates to a method for manufacturing a working layer on the surface of a process roll of a cold rolling mill. Background technique [0002] At present, the surface working layer of the process roll of the high-grade plate cold rolling unit mostly adopts the method of electroplating hard chrome; however, although the anti-adhesion ability of the electroplated chrome layer is very good, its wear resistance is not ideal, which greatly reduces the actual use of the process roll life. [0003] With the rapid development of modern thermal spraying technology, the surface of the process roller adopts thermal sprayed cermet coating to replace the electroplated hard chrome coating. The thermal sprayed coating not only has the same or even higher performance than the electroplated hard chrome layer, but also has no other alternatives. The high-cost economic risk of electroplating hard chromium technology (PVD, CVD, etc.), its cost is equivalent t...

AI Technical Summary

Problems solved by technology

But at the same time, the thermal spraying coating also has its own defects. Due to the high hardness of the thermal spraying coating, the anti-adhesion ability of the surface of the process roll is reduced, so it is very easy to stick foreign matter on its surface, thereby partially weakening the Advantages of thermal spray coatings, so that the service life of process rolls is limited