A kind of steel strip surface iridium plating method

Abstract

A method for plating iridium on the surface of a steel strip: using ordinary low-carbon cold-rolled steel strip as a raw material, degreasing and degreasing; washing and drying; annealing in a full hydrogen protective atmosphere; plating; natural air cooling. The invention produces a Cu-Ag / Ni-Pd / Au-Pt / Ir composite coating with a thickness of 3.0-4.0 µm on the surface of the steel strip, a hardness of 67-73 HV, a surface roughness of 0.017-0.027 µm, and a porosity of no more than 2 pieces / cm 2 , the specular reflectance is 99.93~99.99%; the resistivity is 0.01~0.04µΩ∙cm, the thermal conductivity is 410~420 W / m∙K; after being placed continuously at room temperature for 5000d, the surface oxidation area does not exceed 0.06%, and the loss of light does not exceed More than 0.08%; after being placed continuously for 5000 hours at 350~400°C, the surface oxidation area does not exceed 0.09%, and the loss of light does not exceed 0.10%; after being placed continuously for 5000 hours under 100 KHz ultrasonic waves, the thickness of the coating does not change, nor does it appear Shedding and cracks, it fully meets the needs of precision instruments, medical equipment and other industries.

Description

technical field [0001] The invention relates to a material surface treatment method, which specifically belongs to a method for plating iridium on the surface of a steel strip and is widely used in industries such as precision instruments and medical instruments. Background technique [0002] Iridium (Ir) is an important precious metal with good ductility, surface properties, electrical conductivity, thermal conductivity, oxidation resistance, etc., and is widely used in industries such as precision instruments and medical devices. However, since Ir is a rare element in the earth's crust and is expensive, its application is greatly restricted. In order to reduce costs and save consumption, the current practice in the industry is to replace pure metal Ir with Ir-coated steel strips, and to achieve certain performance through Ir coating. [0003] As far as the traditional iridium plating process for steel strip is concerned, it generally electroplates Cu, Ni, Ag, Ir and other...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the shortcomings of the prior art such as heavy environmental pollution, large waste of raw materials, poor coating quality and poor stability, and to provide a Cu-Ag coating with a thickness of 3.0-4.0 μm formed on the surface of the steel strip. / Ni-Pd / Au-Pt / Ir composite coating, the hardness is 67~73HV, the surface roughness is 0.017~0.027μm, and the porosity is not more than 2 pieces / cm 2 , the specular reflectance is 99.93-99.99%; the resistivity is 0.01-0.04μΩ·cm, the thermal conductivity is 410-420W / m·K; after being placed continuously for 5000d at room temperature 25-35°C, the surface oxidation area does not exceed 0.06 %, the loss rate is not more than 0.08%

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