Chromium-free passivation solution for electrolytic manganese and passivation method of electrolytic manganese

The invention relates to the technical field of anti-oxidation of metal manganese, and particularly the invention relates to a chromium-free passivation solution for electrolytic manganese and a passivation method of electrolytic manganese. The chromium-free passivation solution for electrolytic manganese provided by the invention comprises, by weight, 0.01%-1% of a main passivation agent, 0.01%-0.5% of a cosolvent, 0.05-1% of an inhibitor, 0.07%-2% of a brightening agent and the balance of water. The metal manganese treated by the passivation solution provided by the invention, in the premise of maintaining the original color and good passivation effect, has product quality in line with national standards of production. The passivation agent has no toxicity or harm, simple operation, low cost, and strong industrial promotion significance.