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Performance comparison between electroplated chromium and electroplated nickel-molybdenum alloy in electrolytic copper foil production

The electroplating nickel-molybdenum alloy was replaced by hexavalent chromium plating process. The tensile strength and elongation of electrolytic copper foil before and after surface treatment at high temperature (180 °C) and normal temperature were tested. The chromium plating on the surface of electrolytic copper foil was compared. And high-temperature (180~210 °C) oxidation resistance after electroplating nickel-molybdenum alloy, normal temperature (80 °C) oxidation resistance, and peel strength and deterioration rate after etching or etching with hydrochloric acid for 30 min. It has been found that the surface treatment does not affect the elongation and tensile strength of the electrolytic copper foil. The high-temperature oxidation resistance of electroplated nickel-molybdenum alloy samples is better than that of electroplating chrome. The normal temperature oxidation resistance and acid-base corrosion resistance are comparable to those of electroplated chromium samples. The peel strength and degradation rate after etching are slightly lower, but still consistent with immersion in hydrochloric acid. The peeling strength before and after is not lower than 1.80 N/mm, and the deterioration rate is less than 5.0%. This study provides a basis for the realization of electroplating nickel-molybdenum alloy instead of electroplating.

The hexavalent chromium plating process plays an extremely important role in the electroplating industry. It is called one of the three major plating types and has been used more than 80a. As an anti-oxidation technology for electrolytic copper foil, the electroplating chromium process has the advantages of stable process, low cost, simple operation and good corrosion resistance [1-2], which can improve the normal temperature oxidation resistance of copper foil and prolong the storage time. It can reduce the deterioration rate of copper foil and prevent side corrosion. Although the coating of the hexavalent chromium plating process is beautiful and excellent in performance, there are many disadvantages. In terms of process technology, the hexavalent chromium plating solution has poor dispersing ability and covering ability, low current efficiency (only 10% to 25%), and severe corrosion to the non-soluble anode plate, and it is easy to introduce other impurities to contaminate the plating solution; In terms of environmental protection, hexavalent chromium is a recognized carcinogen, which is extremely harmful to human health. At the same time, chrome-plated wastewater increases environmental pollution and increases water treatment costs. At present, governments have banned or restricted the use of hexavalent chromium to some extent [3-4]. Therefore, the research of the new chromium-forming process is in the eye [5-8].