I. Introduction The barrel and barrel cover of steel drums are mainly formed by cold-rolled sheet metal stamping and welding. At present, the steel drums on the market are mostly galvanized barrels and painting barrels. This article focuses on the application of new products, including spray treatment before spraying barrels. It requires strong anti-corrosion performance in the barrels, and it must not contain toxic and harmful substances, such as chemical barrels, juice barrels and so on. 二ã€Pretreatment equipment According to the shape structure of the steel drum and its own production process characteristics, it is advisable to use a pre-treatment spray production line. Spray-type processing equipment mainly includes liquid storage tanks, spray systems, ventilation systems and related equipment. Related equipment mainly includes heating system, slag removal system and conveying system. Third, the pre-painting treatment status The surface of the cold-rolled steel sheet mainly contains oil stains and no rust. Therefore, the pretreatment station is mainly degreasing and phosphating. The overall process flow is as follows: Pre-degreasing → degreasing → washing → washing → surface adjustment (this station can be omitted) → phosphating → washing → drying 1, degreasing High-quality phosphate film can only be formed on the surface of the workpiece after oil removal, because the residual oil on the surface of the workpiece will not only seriously hinder the growth of the phosphate film, but also affect the coating adhesion, drying performance, decorative properties and corrosion resistance performance. Common degreasing agents are: strong alkaline degreaser, weak alkaline degreaser, organic solvent grease; divided by temperature: high temperature, medium temperature, low temperature degreaser. Strong alkaline degreasing agent contains a large amount of caustic soda (sodium hydroxide), not easy to clean; In addition, the temperature of the degreasing agent can not be too high (usually about 50 °C) to avoid drying before washing, causing rust after phosphating phenomenon. For the selection of the de-esterification liquid, the condition of the oil stain on the working surface and the amount of the foaming agent for the degreasing agent should be fully taken into account in order to avoid excessive foaming, resulting in production difficulties or unnecessary consumption. Using phosphating LT-213 low-temperature weak alkaline degreasing agent, temperature control between 45-55 °C, time is 3-5 minutes, can completely remove the oil, the workpiece is easy to clean, the workpiece water film after cleaning can completely wet the workpiece surface. The spray pressure of the degreased workpiece should be higher to ensure the degreasing effect. Generally, the pressure is 0.1-0.5 MPa. Sprinkling time is controlled for 2 minutes to ensure full reaction between the degreasing solution and the oil stain. Degreasing tank preparation: LT-213 low-temperature weak alkaline degreaser 5% + water 95%. 2, washed The washing station is divided into three channels, the first two are washed after degreasing, and the third is washed after phosphating. The PH value of each large wash should be controlled between 5-7 to maintain the cleanliness of the water. Washing station spray pressure is usually controlled at 0.1 MPa. 3, table adjustment (this station can be omitted) Table adjustment usually only controls the pH: it should generally be controlled between 8-9.5. Preparation of table adjustment: LT301 titanium salt table adjustment 0.1-0.3% water. 4, phosphating The so-called phosphating refers to a method in which a metal workpiece is treated with an acidic solution containing dihydrogen dihydrogen dihydrogen phosphate to generate a stable layer of insoluble or hardly soluble phosphate film on the surface thereof by a chemical reaction, and the resulting film is called Phosphate film. Phosphate film's main role is to improve the adhesion and increase the corrosion resistance of the coating. The varieties of phosphating solution on the market are mixed, although the effect of the treatment can meet the requirements stipulated in the phosphating process conditions before GB6807-2001Q iron and steel workpiece painting, but there are complex operations, containing a lot of carcinogenic substances such as nitros High defects. The use of phosphating LT-101 low-temperature zinc color film phosphating solution, not only easy to operate, but also has no toxic and harmful substances, low cost, fast phosphating speed, long life, etc., in line with GB6807-2001 and GB/T11376 -1997 Metal phosphate conversion film standard. This product has been highly praised by the long-term use of many companies. Phosphate chemical spray pressure is too low, it is easy to cause incomplete phosphating; pressure is too high, can easily cause a large number of phosphating solution splash, is not conducive to film. Usually, the spray pressure should be controlled at 0.05MPa-0.1MPa, and the spraying time of the phosphorus chemical plant should be controlled at 3 minutes to ensure the full reaction between the phosphating solution and the substrate, giving sufficient time for the growth of the phosphate film to avoid leakage. Bottom and yellowing. Phosphating bath solution preparation: LT101 low temperature zinc color film phosphating solution 5% + water 95%. 5. Phosphating film drying The drying of the phosphorus film can play two roles. On one hand, it prepares for painting the next process to remove the water on the surface of the phosphate film; on the other hand, it can further improve the corrosion resistance of the film after painting. Sex. According to the unique structural characteristics of the steel drum and the type of the phosphating film, the drying method is preferably dried in a drying tunnel, the temperature of the drying tunnel is controlled at 120°C-150°C, and the drying time is 5-10 minutes. Fourth, the new process features and precautions 1, process characteristics The main characteristics of the process are: bath stability, easy operation, simple management, long service life, low energy consumption, no pollution, no harmless, low film coating, high gloss coating. 2, matters needing attention The washing station must be thoroughly washed, and the washing bath must be replaced frequently. 3. There must be no residual water in the steel drum before entering the drying tunnel. 4. Strictly control the process parameters, process fluids are tested and adjusted as required.
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