Ultrathin punched nickel-plated steel strip and preparation process thereof

Abstract

The invention relates to the technical field of metal material processing, and discloses an ultrathin punched nickel-plated steel strip and a preparation process thereof.The ultrathin punched nickel-plated steel strip comprises a cold-rolled steel strip base material with the thickness ranging from 0.035 mm to 0.08 mm, a gradient nickel-plated layer is arranged on the surface of the base material and comprises a bottom layer, a transition layer and a surface layer, the bottom layer is of a columnar crystal structure, the transition layer is of an isometric crystal structure, and the surface layer is of a cylindrical crystal structure. The surface layer is of a nanocrystalline structure, precise punched holes are formed in the steel belt, and the hole diameter tolerance of the punched holes is + / -0.005 mm. By selecting the SPCC cold-rolled steel strip with the thickness of 0.035-0.08 mm and optimizing the degreasing and pickling process, the surface roughness Ra of the base material reaches below 0.2 mu m, the percentage elongation after fracture of the steel strip with the thickness of 0.035 mm is improved to 18%, the punching tearing rate is reduced by 90%, the high-cleanliness and high-plasticity base material surface is obtained through the process, a uniformly-combined substrate is provided for subsequent electroplating, and the service life of the base material is prolonged. And the stability of mechanical properties of products is ensured.

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