Steel strip surface iridium plating method

Abstract

The invention relates to a steel strip surface iridium plating method. A common low-carbon cold-rolled steel strip is used as a raw material and is degreased, the steel strip is washed and dried, annealing is carried out in a full-hydrogen protective atmosphere, plating is carried out, and the steel strip is subjected to natural air cooling. According to the steel strip surface iridium plating method, a Cu-Ag / Ni-Pd / Au-Pt / Ir composite coating with the thickness of 3.0 microns-4.0 microns is generated on the surface of the steel strip, the hardness is 67 HV-73 HV, the surface roughness is 0.017-0.027 microns, the porosity is not more than 2 / cm2, and the specular reflectance is 99.93%-99.99%; the electrical resistivity is 0.01 micro-ohm.cm-0.04 micro-ohm.cm, and the thermal conductivity is 410 W / m.K-420 W / m.K; after the coating is continuously placed for 5000 days at normal temperature, the surface oxidation area does not exceed 0.06%, and the gloss loss rate does not exceed 0.08%; afterthe coating is continuously placed for 5000 h at 350 DEG C-400 DEG C, the surface oxidation area does not exceed 0.09%, and the gloss loss rate does not exceed 0.10%; after the coating is continuouslyplaced for 5000 h under 100 KHz ultrasonic waves, the thickness of the coating does not change, falling and cracks do not occur, and the requirements of the industries of precision instruments, medical instruments and the like are completely met. The coating completely meets requirements of precise instruments, medical instruments 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...

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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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