Common knowledge of coating: coating spraying process for repairing metal wear parts

Core tip: metal spraying process Process flow: pretreatment → spraying → drying Pretreatment is to make the coating film strong adhesion, not easy to fall off, long life Before spraying, the part surface must be pretreated The pretreatment methods of different metal parts are different Iron and steel parts are mainly treated by degreasing, derusting, phosphating, etc water cleaning solution is commonly used to decontaminate and Degrease Oil, and mechanical or chemical method is used for derusting Phosphating is to immerse parts in acid diluent (density 1.0-1.1, pH = 1-3), and reaction will occur at the interface between the two A dense phosphating film is formed on the surface of the part Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Paint Home News: metal spraying process: pretreatment → spraying → drying Pretreatment is to make the coating film strong adhesion, not easy to fall off, long life Before spraying, the part surface must be pretreated The pretreatment methods of different metal parts are different Iron and steel parts are mainly treated by degreasing, derusting, phosphating, etc water cleaning solution is commonly used to decontaminate and Degrease Oil, and mechanical or chemical method is used for derusting Phosphating is to immerse parts in acid diluent (density 1.0-1.1, pH = 1-3), and reaction will occur at the interface between the two A dense phosphating film is formed on the surface of the parts, so as to improve the adhesion and rust resistance of the paint film Aluminum and its alloy parts are mainly treated by removing oil and oxide film The method of removing oil is the same as that of iron and steel parts The oxide film is removed by pickling, and then transformed by chemical transformation If the surface requirements of parts are not high, transformation treatment can not be carried out According to the variety, performance and curing conditions of the coating, the spraying process and method are different There are more than ten kinds of coatings, such as grease coating, natural resin, epoxy resin and phenolic resin, which can be selected according to the actual situation Spraying methods include manual, automatic, electrostatic, electrophoresis and other methods, which can be selected according to the parts batch, shape and size and existing equipment Wear of parts will cause failure of the whole system, which can be reused by spraying For example, a picture tube factory imported nearly ten thousand yuan vibrating feeder from Japan, whose disk surface is aluminum alloy, with a diameter of about 500-600mm Due to long-term use, the material channel is seriously worn, and there are many scratches, which can not work normally The problem is solved quickly and effectively after spraying with polyamide epoxy resin which is easy to cure The specific scheme is as follows: pretreatment, clean the oil stain on the disk surface with trichloroethane, and then soak it in nitric acid for about 30s Just rinse The surfaces not to be sprayed shall be protected with adhesive tape, and the vibration plate shall be placed horizontally on the protectors (paper, cloth, etc.) to prevent paint splashing The ingredients are as follows: 6101 epoxy resin 1kg, 650 polyamide 0.5kg, chromium oxide 0.2kg, a small amount of talcum powder, mixing + anhydrous ethanol → stirring evenly Spray with manual spray gun In order to ensure even and smooth coating, the pressure of spray gun and paint output must be adjusted At the same time, the distance between the gun and the disk surface shall be kept at 300-500mm, and spraying shall be conducted in three times, and the coating shall be as uniform as possible Drying, natural drying about 24 hours; drying temperature 100 ℃, 1.5 ~ 2.0 hours After spraying, the plate surface is even and smooth, and the field application effect is good It can be used continuously for 8-12 months Conclusion: it is economical and practical to repair metal wear parts by coating, which opens a new way for surface treatment of metal parts Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,