How to seal the fan blade after anodizing?

Views : 319
Author : JU lai
Update time : 2023-06-16 11:34:44

Anodic oxidation treatment plays a vital role in the surface treatment of energy-saving industrial fan blades. On one hand, fan blades made of pure aluminum or aluminum sheets have a relatively single color and may lose their luster over time due to oxidation with oxygen. On the other hand, anodic oxidation films can be dyed in various bright colors, making the surface of the blades more attractive, and customized colors can be tailored to meet different customer needs.

Although anodic oxidation treatment can solve the problem of surface color for fan blades, the dyed oxide film has a high porosity and adsorption capacity, which makes it easy to be contaminated. Especially when industrial fans are used in corrosive environments, the corrosive medium may enter the pores and cause corrosion. Furthermore, the color fastness and sun resistance of the colored film after dyeing is poor without special treatment. Therefore, appropriate sealing technology is needed to close the micro-pores of the oxide film on the fan blades to reduce their adhesion and improve their corrosion resistance, while maintaining the beautiful color.

There are various methods for sealing the aluminum oxide film on fan blades. These methods include boil sealing and steam sealing based on hydration reactions, physical sealing based on surface coating, and sealing filled pores through hydrolysis reactions. The latter provides chromium salt sealing, chromate sealing, nickel acetate sealing, and nickel-fluoride sealing systems at room temperature.

Currently, the use of sealing agents abroad mainly involves the use of nickel salt sealing agents, with high-temperature nickel acetate sealing agents in Japan and room-temperature nickel acetate sealing agents in Europe and America being the main types. The sealing quality of high-temperature nickel acetate sealing agents is better than that of room-temperature nickel acetate sealing agents, making them more widely used. The principle behind it is that nickel ions, under certain pH conditions, act together with water and surfactants to cause hydrolysis, and the hydrolysis products appropriately aggregate into the pores of the aluminum surface oxide film to achieve sealing. The pH buffer plays a role in stabilizing the solution pH value and controlling the degree of nickel ion hydrolysis, while surfactants coordinate with counterions to form complexes, controlling the concentration and hydrolysis of simple nickel ions. At the same time, appropriate dispersion and wetting effects are produced in the sealing liquid. This keeps the hydrolysis products of nickel ions properly aggregated, ensuring that no powdery frost appears and minimizing the impact on dye dispersion while achieving a relatively fast sealing rate.

For domestic energy-saving industrial fan manufacturers, most of the sealing agents for the anodic oxidation of fan blades are currently imported from abroad. Although the cost is high, the production step of sealing cannot be omitted to ensure the color and long-term effect of the fan blades.

Related News
Read More >>
How many blades are good for HVLS industrial fans? How many blades are good for HVLS industrial fans?
Jun .30.2023
The HVIST fan was invented by a joint venture between a US and a Chinese company in 1999. After almost 20 years of development, various industrial fans with different numbers of blades have emerged. Currently, domestically and internationally, industrial fans mainly come in three-blade, four-blade, five-blade, six-blade, and eight-blade configurations. In theory, the more blades a fan has, the greater the airflow. However, since industrial fans are generally larger in size, more blades also mean more weight and increased safety risks. Therefore, it is necessary to strike a good balance between airflow and quality. Currently, industrial fans with five or six blades are most popular on the market. These two types are also the main products promoted abroad and have been market-certified for over a decade. As long as manufacturers strictly require high quality and safety for the blades, they can meet market demand.
Large fans in the indoor basketball hall improve ventilation and cooling Large fans in the indoor basketball hall improve ventilation and cooling
Jun .27.2023
With the promotion of nationwide fitness, various communities have built indoor basketball courts of different sizes. However, the large span, high height, and relatively sealed building structure of basketball courts pose great challenges to ventilation and cooling. In recent years, many venue constructors have found that large fans (big ceiling fans) can perfectly solve the ventilation and cooling problems, which are tricky for indoor basketball courts.
Principles to be followed in designing industrial large fan blades Principles to be followed in designing industrial large fan blades
Jun .27.2023
Industrial large fans have been imported into China from abroad, and batches of industrial fan manufacturers have been continuously researching, developing, and producing a full range of large industrial fan series products suitable for various environmental improvements in China. High-quality large fans are often built on good materials and unique advanced designs. The fan blades of industrial large fans are made of 5052 aviation aluminum, and unique blade designs can maximize the advantages of large fans and meet the needs of different users. When designing fan blades, industrial fan manufacturers need to follow certain principles.
pop_close
pop_main
Stay In The Know
Enter your email to hear from us about Product list, Latest Products and Customer application examples!