Silane coating agent and preparation method thereof

The invention discloses a silane coating agent and a preparation method thereof. The silane coating agent is prepared from nitric acid, zinc oxide, sodium bicarbonate, a nano coupling agent, rare earth purification powder and a surfactant, phosphorus pollution is fundamentally eliminated, the silane coating agent adapts to urgent needs of environmental protection, the treatment effect of the silane coating agent is very prominent, and the silane coating agent shows a very good prospect. According to the method, the surface conditioning procedure can be omitted, heating is not needed, sediment is not generated in the silane treatment process, the problem of solid waste treatment in the pretreatment procedure is solved, and compared with traditional phosphorization, the process is simple, the flow is short, and operation is easy. In addition, according to the invention, the inverted bath period of the bath solution is effectively prolonged, so that the productivity is improved, the continuous operation cost of