Several anti-corrosion treatment methods for evaporator
Most evaporator equipment consists of welded parts, plates, and cylinders. Anti-corrosion treatment for evaporator equipment for different purposes.
Electrostatic powder coating: The traditional paint coating is liquid. It contains a large amount of organic solvents such as ester ketones and hydrocarbons, which brings a series of troubles to production, storage, transportation and construction. It is flammable, explosive and 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 evaporator machine is mostly made of cold-rolled stainless steel plate, so the cost is high.
Phosphating - passivation process
In the manufacture of vibrating fluidized bed evaporators, 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.
Discussion on welding of nickel-chromium stainless steel
Many of the evaporator equipment 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 stainless steel and ordinary carbon steel is that the thermal conductivity is poor, the expansion coefficient is large when heating, and the resistance value is high. Due to these characteristics of steel, special welding techniques 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. The corrosion forms of steel welding are: integral, partial, intergranular corrosion.
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