Anti-corrosion method and coating process of highway guardrail network

the usual anti-corrosion method used in the highway guardrail network is powder immersion method it originated in the fluidized bed method so-called fluidized bed was originally applied to petroleum contact decomposition in the Winkler gas generation furnace, and then developed the solid gas two-phase contact process, and then gradually used in metal coatingSo sometimes still called "fluidized bed cladding method", the actual process is to add the powder coating to the bottom porous breathable container (flow tank), by the blower from the bottom into the processed compressed air, so that the powder coating flip sway to a "fluidized state", become a uniform distribution of fine scattered powderthe coating process of the highway guardrail networkthe coating process of the highway guardrail network is completed by two stages: the first stage is the fixed bed stage, the second stage is the air flow transport stage, the flow rate (W) continues to increase on the basis of the fixed bed, the bed layer begins to expand and loosen, the height of the bed layer begins to increase, each powder particle is floated, so leave the original position for a certain degree of movement, then enter the fluidized bed stageThe bc segment shows that the powder layer in the fluidized bed expands, its height (I) increases with the increase of the gas velocity, but the in-bed pressure force (P) does not increase, changes the flow rate within a certain range without affecting the unit power required by the fluid, which is the characteristic of the fluidized bed, it is the use of this feature for coating processThe uniformity of the fluidized powder fluidization state in the fluidized bed is the key to ensure uniform coatingThe fluidized bed used in the powder coating belongs to the "vertical fluidization" fluidization number must be tested to find out, generally to be able to apply, the suspension rate of powder in the fluidized bed can be up to 30 to 50%