Metal coating pretreatment washing-free silane treatment agent and preparation method thereof

The invention relates to a metal surface treatment technology, and provides a metal coating pretreatment washing-free silane treatment agent. According to the technical scheme, the metal coating pretreatment washing-free silane treatment agent comprises the following components of 5%-20% of a silane coupling agent, 2%-10% of an organic amine modifier, 0.5%-5% of alcohol, 0.5%-5% of a water-solublestabilizer, 0.1%-0.5% of a chelating agent, 0.1%-2% of an auxiliary agent and the balance water. The silane treatment agent is apparently clear and is transparent liquid with no suspended solids. Thewashing-free silane treatment agent can form a silane film on a metal surface, and has the following advantages that (1) the washing-free silane treatment agent is free of phosphorus, heavy metal andsediment; (2) washing is avoided; (3) the film forming efficiency is high, and the processing time is short; (4) operation is simple and quick, and the washing-free silane treatment agent can be usedin a spraying or soaking mo