The treatment of the surface of the steel pipe is one of the key factors to ensure the performance of the epoxy powder anti-corrosion layer. The anticorrosion production line adopts two shot blasting and descaling machines connected in series. The first one uses steel shots to remove rust; the second one uses steel grit to roughen the surface of the steel pipe to facilitate the adhesion of the powder to the steel pipe. Both steel shot and steel grit are produced in France. The hardness of steel shot is 48 ~ 52HRC, and the hardness of steel shot is 53 ~ 57HRC. The selection of steel shot and steel grit takes into account the strength and hardness of the steel pipe, and the steel shot and steel sand can be recycled. Factors such as the number of times and the impact on the life of the blast blade. After being processed by two shot blasting machines, the derusting grade of the steel pipe can reach Sa2.5 ~ Sa3.0, and the anchor depth is about 80um (standard requirement is 40-100um).
Phosphoric acid is used for pickling, the concentration is 10 (manufacturer recommends 5 ~ 20). The concentration of chromate treatment is 10 (factory recommends 5 ~ 50). The salt content on the surface of the steel pipe is determined by chemical reagents. The heating temperature is related to the diameter of the steel pipe, the wall thickness, and the thickness of the anti-corrosion layer. According to the manufacturer's recommendation, the heating temperature is set to 235-245C, and the production speed is controlled according to the gelation / curing time of the powder. Use a differential scanning calorimeter (DSC) to determine (the curing time provided by the manufacturer. 605 at 235C, 405 at 245), whether the anti-corrosion layer can meet the curing requirements. Using 24 spray guns, the principle of flow control is to ensure that the thickness of the anti-corrosion layer is uniform, and most of the sprayed powder can be coated on the pipe. Using two-component liquid powder repair material. The repair method is to polish the defect and its surroundings (usually file or sandpaper), and then apply the mixed repair material with a spatula to make the thickness uniform and slightly higher than the surrounding anti-corrosion layer. Wait for the surface to dry before proceeding EDM inspection, no leakage point is qualified.
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