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Cyanide - Free Electro - Galvanizing Blackening Process of Rolled Copper Foil

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  • College of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China

Received date: 2021-12-20

  Revised date: 2022-01-27

  Accepted date: 2022-02-23

  Online published: 2024-01-09

Abstract

For developing a cyanide - free, environmentally friendly and low - cost rolled copper foil blackening process, 45.4~79.5 g/L Zn2+, 20.0~30.0 g/L sodium citrate, 30.0~50.0 g/L boric acid and 5.0~15.0 g/L ammonium sulfate were used as the basic bath components to form a light trapping structure on the surface of the rolled copper foil by adding additive A (surfactant) and additive B (inhibitor), so as to realize the blackening of cyanide - free electro - galvanizing. Moreover, the influences of bath composition and process parameters on the brightness (L*) of the coating were studied, and the electrical conductivity, roughness, high - temperature oxidation resistance and other properties of the blackened foil were tested. Results showed that the electrical conductivity of galvanized blackened foil was better than that of the nickel - plated blackened foil, and the brightness of zinc coating with a roughness (Rz) greater than 1.3 μm could meet the blackening requirements and as well as standards regarding low - profile copper foil. Furthermore, the galvanized blackened foil also met the high temperature oxidation resistance requirements.

Cite this article

RAO Xiang, LIU Xin - kuan . Cyanide - Free Electro - Galvanizing Blackening Process of Rolled Copper Foil[J]. Materials Protection, 2022 , 55(5) : 123 -128 . DOI: 10.16577/j.issn.1001-1560.2022.0135

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