7, poor drying After drying, drying according to the technical specifications for drying, but the coating film is not completely cured, the film is wet, the hardness is low or the surface does not dry out, which all belong to poor drying. Causes: (1) Residues of water or oil on the surface of steel drums. (2) The compressed air used for spraying contains oil and water. (3) Spray coating is too thick. (4) Drying room is poor in ventilation (poor ventilation), high humidity in the kiln, low temperature and insufficient drying time. Improvements: (1) Strengthen the treatment of the surface of the steel drum before painting to remove the enthalpy and moisture in the compressed air. (2) Control spray coating thickness. (3) Ensure that all technical conditions in the drying room are good. 8, rust Shortly after the drum was painted, red lines appeared under the coating or rust spots appeared through the coating. Causes: (1) There is a problem with the treatment of steel drums before coating, the surface quality of the steel drums is poor, rust exists in the steel drums, and the steel drums are not clean beforehand. (2) The coating film on the surface of steel drums is incomplete. If there are defects such as pinholes, missing coating and exposed bottom, the corrosion resistance of the coating film is poor. (3) Damage to the coating film during stacking. The humidity and temperature of the storage air are high. Improvements: (1) Before the painting, the surface of the steel drum must be cleaned, and it may be best to perform phosphating treatment. (2) Ensure the integrity of the steel drum coating. (3) When stacking, do not damage the coating, and do not roll on the site; warehouses should pay attention to ventilation and open stacking is strictly prohibited. 9, become brittle The phenomenon of loss of elasticity or deterioration of the elasticity of the coating film is called brittleness, and it is a prelude to the cracking or peeling of the coating film. Causes: (1), overheating and drying, that is, excessive dry temperature, long drying time makes the film become brittle. (2) After the paint expires, the poor coating material can also become brittle. (3), the film is used under low temperature conditions. Improvements: (1) Drying according to the recommended drying conditions for the process or technical conditions. If the drying room needs to be repaired for a long time due to a fault, the temperature of the kiln body in the drying room should be reduced or the dried steel drums taken out in time. (2) Use high-quality coating, pay attention to the effective period of the coating. (3) The use of steel drums under extremely low temperature conditions requires the use of special paints for coating. 10, coating defect repair method According to the type of film defects, the degree of severity and its degree of influence on the protective properties of the coating to a reasonable choice of coating finishing methods, generally the following three kinds of dressing process. (1) Under the premise that the flatness, overall adhesion and protective performance of the coating are not affected, the defect is small, and the range is not wide, it is generally directly or gently sanded with sandpaper, and the defects are manually refilled. Such dressing processes are suitable for exposed bottoms, poor coverage, and other minor lighter defects. (2) In cases where the defects are serious and affect the flatness, integrity and even the overall protective performance of the coating, it is generally necessary to use sandpaper and other methods to remove the film defects. Then re-spray, and pay attention to timely measures to no longer appear similar defects. (3) When the defects are serious, the coating is incomplete, and the protective properties have been lost, such as severe pinholes, rust, brittleness, peeling and cracking, etc., the original coating should be completely removed. Coating, make it a qualified product.
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