Production method for Cu-Ni/Ni-Ag double-composite coating extra-thin steel strip

Abstract

The invention discloses a production method for a Cu-Ni / Ni-Ag double-composite coating extra-thin steel strip. The production method comprises the following steps of performing primary cold rolling on an SPHC hot rolled coil subjected to acid pickling; after conventional degreasing is finished, performing primary annealing; performing secondary cold rolling; performing conventional degreasing and coiling; preparing a strip; uncoiling, striping and removing burrs; electroplating Cu-Ni; performing primary conventional washing and drying; performing thermal spraying on Ni-Ag; performing secondary conventional washing and drying; performing secondary annealing; naturally cooling to room temperature and then coiling. According to the product disclosed by the production method disclosed by the invention, the tensile strength is 330 to 380MPa, and the elongation is 34 to 38 percent; a layer of Cu-Ni / Ni-Ag double-composite coating with uniformity, compactness and high adhesive force is generated on the surface of the product; the surface hardness of the coating is 90 to 100HV, the roughness of the coating is 0.15 to 0.30 mu m, the mirror reflectivity is 88 to 95 percent, the resistivity is 6.5 to 8.7 mu omega cm, and the thermal conductivity is 6 to 10W / cm DEG C. The problems of high cost, great waste, serious pollution and low efficiency caused by a traditional process are solved.

Description

technical field [0001] The invention relates to a production method of a steel strip, in particular to a production method of an ultra-thin steel strip with Cu-Ni / Ni-Ag double composite coating. Background technique [0002] Due to its thin thickness, excellent surface properties, electrical conductivity and thermal conductivity, the ultra-thin Ag-plated steel strip is widely used in the optoelectronic industry to produce precision electronic components and optical instrument parts, and the market demand is huge. [0003] At present, the production of Ag-plated steel strip is mainly to continuously segmentally electroplate Cu, Ni, and Ag single metals on the surface of cold-rolled strip steel to form a traditional Cu-Ni-Ag composite coating. Although this process has a long history, it has several problems that are difficult to solve, namely: the first is that the coating is based on Cu, which is prone to oxidation, resulting in a decrease in the stability of the coati...

AI Technical Summary

Problems solved by technology

The problem of high cost and poor corrosion resistance of the pure nickel layer on the steel strip is solved, and the obtained double-coated steel plate is mainly used for the manufacture of electrodes

However, because there is no Ag-containing composite coating in the steel strip, the surface properties, electrical conductivity and thermal conductivity of the product cannot meet the requirements of the optoelectronics industry.

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