Metal pretreatment liquid as well as preparation method and application thereof

Abstract

The invention relates to metal pretreatment fluid and a preparation method and application thereof, and belongs to the technical field of metal anti-corrosion pretreatment fluid, the metal pretreatment fluid comprises, by mass, 8-15% of a main film-forming agent, 4-6% of a film-forming accelerant, 1-2% of nitric acid, 0.1-0.3% of cerous nitrate and the balance deionized water, a film-forming substance in the treating fluid is formed by compounding hexafluorozirconic acid and phytic acid, zirconium hydroxide is formed in the hydrolysis process of hexafluorozirconic acid, is cross-linked with active hydroxyl formed by hydrolysis of phytic acid, and is matched with a rare earth compound cerium nitrate to form an organic-inorganic composite film layer which can be combined with the surface of active metal, so that the adhesive force and the corrosion resistance of steel coating are improved.

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