The invention discloses a
steel mill continuous annealing galvanized sheet
chromium-free compound passivator which comprises the following raw materials in percentage by weight: 5-20 percent by weight of a main film-forming agent, 0.1-5 percent by weight of a
coupling agent, 0.1-0.5 percent by weight of inorganic complex film-forming agent, 0.1-4 percent by weight of
silicate, 0.1-0.4 percent of an emulsifying agent, 0.1-0.2 percent of a dispersing agent, 0.1-0.4 percent of a
corrosion inhibitor, 0.1-0.3 percent of a protective
colloid, 0.1-1 percent of a nanometer sealing agent, 0.1-0.4 percent of
phosphate and the balance of water. The
steel mill continuous annealing galvanized sheet
chromium-free compound passivator disclosed by the invention is uniform in appearance, stabilizes a liquid, has an
expiration date of above 90 days, is nontoxic and environment-friendly, and accords with the ROHS (Restriction Of Hazardous Substances) requirement. The
steel mill continuous annealing galvanized sheet
chromium-free compound passivator is simple in preparation process; a passivated film is uniform in appearance and has certain glossness. A galvanized sheet passivated by using the passivator has the advantages that the
corrosion resistance is remarkably improved, the neutral salt mist SST (
Sea Surface Temperature) resistant time reaches above 72 hours, the white
rust area is less than 5 percent, the blackening resistance
delta E is less than 5, the yellowing resistance
delta E is less than 3, the alkaline resistance
delta E is less than 3, the interlamination resistance R is less than 3
omega / cm, and the
conductivity is less than 1 m
Omega.