Environment-friendly passivation composition for tin plate as well as preparation method and application of environment-friendly passivation composition

The invention discloses an environment-friendly passivation composition for a tin plate as well as a preparation method and application of the environment-friendly passivation composition. The environment-friendly passivation composition is prepared from the following components in percentage by weight: 0.05 percent to 2 percent of water-soluble complex fluoride containing transition metal elements, 0.005 percent to 0.2 percent of a Cr < 3 + >-containing water-soluble compound, 0.005 percent to 0.2 percent of a hydrolyzed oligomer of trialkoxysilane containing an organic functional group, 0.05 percent to 0.2 percent of a PO4 < 3->-containing water-soluble substance and pure water or deionized water, a trivalent chromium compound with good environmental protection property is introduced to form a chromium (III) oxide layer to strengthen the sulfuration resistance of the chromium-free Zr-Ti nano passivation layer while the advantages of rapid film formation, suitability for a high-speed continuous tin plate pro