Chromium-free passivation solution for improving oxidation resistance of copper foil, preparation method and application thereof

Abstract

This invention discloses a chromium-free passivation solution for improving the oxidation resistance of copper foil, its preparation method, and its application. It belongs to the field of copper foil passivation treatment technology and includes the following raw materials in parts by weight: 1.5-5 parts corrosion inhibitor, 7-15 parts organic acid, 2-6 parts inorganic acid, 1-3 parts phosphate, 0.1-2 parts wetting agent, 1-3 parts oxidant, 1-3 parts titanium salt, and 1-6 parts rare earth salt. The preparation method is as follows: first, add titanium salt to inorganic acid and stir to dissolve; then add deionized water to dilute it 20-50 times; then add oxidant and stir until dissolved to obtain solution A; then gradually add corrosion inhibitor, rare earth salt, phosphate, and wetting agent to solution A obtained in step S1 and stir to dissolve; then add organic acid to adjust the pH of the passivation solution to 2.5-3.9 to obtain the chromium-free passivation solution. This invention significantly improves the high-temperature oxidation resistance and corrosion resistance of copper foil through a hybrid film structure, perfectly meeting the needs of high-end industries; it also has multiple advantages such as simple process and strong stability of passivation solution.

Images