▎ 摘　　要

NOVELTY - Hot-dip galvanized passivation solution comprises 30-50 g/l tannic acid, 1.5-4 g/l rare earth metal salt, 1-3 g/l citric acid, and water (balance). USE - The hot-dip galvanized passivation solution is useful in material surface processing technology field for improving corrosion resistance of steel material surface. ADVANTAGE - The hot-dip galvanized passivation solution has good corrosion resistance and adhesive force, improves single inorganic or organic matter to passivate the galvanized layer. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a passivation method.