Most drying equipment consists of welded parts, flat plates, and cylinders. It is really anti-corrosion treatment for dryers of different purposes. Here are some experiences in anti-corrosion and manufacturing methods.
1. Phosphating-passivation process In the manufacture of vibrating fluidized bed dryers, 70% of the parts are carbon steel structures. The turnover time between the processes is long, so a large amount of rust is generated on the surface, and more labor is required to remove the rust before painting. Phosphating-passivation process, through electrical and electrochemical reactions, through a one-time treatment, can make the steel workpiece full of rust, the surface presents the original color of the metal, while forming a dense anti-rust film on the metal surface . It can be placed in humid air for ten days without rusting. Its operation method is simple, it can improve the working environment, reduce labor intensity and save manpower and material resources. For phosphating - the passivation treatment solution contains emulsifier, molybdate, soluble phosphate and various acids. This method is not only used in the above models, but other similar structures or frames can be used for corrosion protection. deal with.
2, the application of electrostatic powder coating in the manufacture of drying equipment, the traditional paint coating is liquid, which contains a large number of organic solvents such as ester ketones and hydrocarbons, bringing a series of troubles to production, storage, transportation, construction, flammable and explosive And very unsafe. Due to certain toxicity, it volatilizes into the atmosphere and seriously pollutes the environment. Therefore, coating experts at home and abroad are working on new coatings that use less or no solution. One of the new coatings is powder coatings. The upper cover plate of the vibrating fluidized bed dryer is mostly made of cold-rolled stainless steel plate, so the cost is high. Why use stainless steel instead of ordinary carbon steel, because the equipment will be exposed to various corrosive materials and gases during working conditions, and stainless steel has excellent corrosion resistance, so it is made of stainless steel cold-rolled sheet. The electrostatically sprayed polyester resin powder coating is made of ordinary carbon steel, and its corrosion resistance is completely comparable to that of stainless steel. Because of its toughness, durability, and decorative properties, this powder coating has excellent outdoor weather resistance and heat resistance, as well as excellent corrosion and powder resistance, excellent gloss and chromatic properties, so static electricity Powder coating is fully suitable for corrosion protection in the dryer housing.
3. Discussion on the welding of austenitic nickel-chromium stainless steel Many of the drying equipments are plate welded structural parts, and most of the plates are 1Cr18Ni9Ti (18-8 type). Corrosion, fracture and other problems often occur during the welding process. Seriously affect product life and performance. The difference between austenitic stainless steel and ordinary carbon steel is that the thermal conductivity is poor, the expansion coefficient is large when heated, and the resistance value is high. Due to these characteristics of austenitic steels, special welding processes are required for welding. Intergranular corrosion is one of the main problems of high alloy steel. This steel itself has high corrosion resistance, but the corrosion resistance is reduced during the welding process. Corrosion forms of austenitic steels during welding include: integral, local, and intergranular corrosion. A domestic factory introduces foreign drying equipment. The stainless steel frame of the bag filter has caused intergranular corrosion due to the improper welding method, which destroys the structure of the material. The material contains acidic components during the drying process, and the steel frame quickly breaks.
Drying technology has developed to the present day. As an engineering technology, success is not only related to the level of drying theory, but also closely related to equipment structure, material selection, and manufacturing methods. It is of great economic significance to formulate reasonable processing and manufacturing solutions based on a variety of factors.
1. Phosphating-passivation process In the manufacture of vibrating fluidized bed dryers, 70% of the parts are carbon steel structures. The turnover time between the processes is long, so a large amount of rust is generated on the surface, and more labor is required to remove the rust before painting. Phosphating-passivation process, through electrical and electrochemical reactions, through a one-time treatment, can make the steel workpiece full of rust, the surface presents the original color of the metal, while forming a dense anti-rust film on the metal surface . It can be placed in humid air for ten days without rusting. Its operation method is simple, it can improve the working environment, reduce labor intensity and save manpower and material resources. For phosphating - the passivation treatment solution contains emulsifier, molybdate, soluble phosphate and various acids. This method is not only used in the above models, but other similar structures or frames can be used for corrosion protection. deal with.
2, the application of electrostatic powder coating in the manufacture of drying equipment, the traditional paint coating is liquid, which contains a large number of organic solvents such as ester ketones and hydrocarbons, bringing a series of troubles to production, storage, transportation, construction, flammable and explosive And very unsafe. Due to certain toxicity, it volatilizes into the atmosphere and seriously pollutes the environment. Therefore, coating experts at home and abroad are working on new coatings that use less or no solution. One of the new coatings is powder coatings. The upper cover plate of the vibrating fluidized bed dryer is mostly made of cold-rolled stainless steel plate, so the cost is high. Why use stainless steel instead of ordinary carbon steel, because the equipment will be exposed to various corrosive materials and gases during working conditions, and stainless steel has excellent corrosion resistance, so it is made of stainless steel cold-rolled sheet. The electrostatically sprayed polyester resin powder coating is made of ordinary carbon steel, and its corrosion resistance is completely comparable to that of stainless steel. Because of its toughness, durability, and decorative properties, this powder coating has excellent outdoor weather resistance and heat resistance, as well as excellent corrosion and powder resistance, excellent gloss and chromatic properties, so static electricity Powder coating is fully suitable for corrosion protection in the dryer housing.
3. Discussion on the welding of austenitic nickel-chromium stainless steel Many of the drying equipments are plate welded structural parts, and most of the plates are 1Cr18Ni9Ti (18-8 type). Corrosion, fracture and other problems often occur during the welding process. Seriously affect product life and performance. The difference between austenitic stainless steel and ordinary carbon steel is that the thermal conductivity is poor, the expansion coefficient is large when heated, and the resistance value is high. Due to these characteristics of austenitic steels, special welding processes are required for welding. Intergranular corrosion is one of the main problems of high alloy steel. This steel itself has high corrosion resistance, but the corrosion resistance is reduced during the welding process. Corrosion forms of austenitic steels during welding include: integral, local, and intergranular corrosion. A domestic factory introduces foreign drying equipment. The stainless steel frame of the bag filter has caused intergranular corrosion due to the improper welding method, which destroys the structure of the material. The material contains acidic components during the drying process, and the steel frame quickly breaks.
Drying technology has developed to the present day. As an engineering technology, success is not only related to the level of drying theory, but also closely related to equipment structure, material selection, and manufacturing methods. It is of great economic significance to formulate reasonable processing and manufacturing solutions based on a variety of factors.
Taizhou Gaogang District Dixin Medical Equipment Co., Ltd. , https://www.dixinmedical.com