Dipping technology of guardrail net: The common anticorrosion method of guardrail net is powder dipping, which originated from fluidized bed method. The so-called fluidized bed was first applied to oil contact decomposition in Winkler gas producer, and then a solid-gas two-phase contact process was developed, and then it was gradually applied to metal plastic coating. Therefore, it is sometimes called "fluidized bed coating method". The actual process is to add the powder coating into a container (flowing tank) with a porous bottom, and send the treated compressed air from below with a blower, so that the powder coating becomes "fluidized state" and becomes evenly distributed fine powder. The impregnation process of guardrail net includes two stages: the first stage is the fixed bed stage, and the second stage is the air transportation stage. On the basis of the fixed bed, the velocity (w) is continuously increased, and the bed begins to swell and loosen, and the bed height begins to increase, and each powder particle floats up, thus leaving the original position and moving to a certain extent, and then entering the fluidized bed stage. The bc section shows that the powder layer in the fluidized bed expands, and its height (I) increases with the increase of gas velocity, but the pressure (△P) in the bed does not increase, and the flow velocity changes in a certain range, which does not affect the unit power required by the fluid. This is the characteristic of fluidized bed, which is used to realize the coating process. The uniformity of powder fluidization state in fluidized bed is the key to ensure coating uniformity. The longer the soaking time, the thicker the coating. The coating thickness can reach 0.8-65438 0.0 mm. ..