Performance of HIFULL® Hydrophobic Fumed Silica in Power Systems
What impact does hydrophobic fumed silica have on the performance of anti-pollution flashover coatings?
HIFULL’s technical team, while ensuring core anti-flashover performance, conducted comparative analyses between HIFULL® HB-132 and competing products in multiple corrosive environments, including acid, alkali, salt solutions, and transformer oil.
What are anti-pollution flashover coatings
Anti-pollution flashover coatings are specialized materials developed to solve pollution flashover problems in electrical equipment. Their core function is to form a protective layer with special properties on equipment surfaces, preventing the adsorption of pollutants and the formation of conductive paths, thereby reducing the likelihood of pollution flashover accidents. These coatings not only require strong anti-flashover capabilities but also need to maintain stability in various complex chemical environments, with corrosion resistance being a critical performance indicator.
To visually and accurately compare the corrosion resistance performance of HIFULL® HB-132 and competing products, technical personnel conducted a series of experiments.
They immersed both HIFULL® HB-132 and competing products in 3% dilute acid, 3% dilute alkali, 3% salt solution, and 100°C transformer oil for 24 hours, observing changes in the coatings.
1. Acid Resistance Comparison
From the experimental results (Figure 1), after immersion in 3% dilute acid for 24 hours, both competing products and HIFULL® HB-132 maintained their pre-experiment condition, uniform color, smooth surface, and no signs of corrosion. Fumed silica effectively resists dilute acid erosion, demonstrating excellent stability in acidic environments.
2. Alkali Resistance Comparison
In the 3% dilute alkali environment, both coatings showed almost no difference compared to pre-experiment states after immersion. They remained tightly adhered to the substrate without any adverse changes such as blistering or peeling.
3. Salt Solution Resistance Comparison
In the 3% salt solution immersion test, both competing products and HIFULL® HB-132 coatings maintained good appearance and structure after 24 hours of immersion. They effectively resist salt solution corrosion, providing reliable protective barriers for electrical equipment in humid, salt-containing environments.
4. Transformer Oil Resistance Comparison
The 100°C transformer oil environment poses a severe challenge to coating corrosion resistance. After immersion, both competing products and HIFULL® HB-132 coatings maintained their morphology and performance, remaining tightly bonded to the substrate, demonstrating outstanding high-temperature oil corrosion resistance.
Overall, as the first line of defense for power grid external insulation, continuous improvement of anti-pollution flashover coating performance is essential to meet increasingly complex operating environments. Through systematic comparison in this experiment, the product advantages and application value of fumed silica, particularly hydrophobic fumed silica HB-132, in acid, alkali, salt, and oil resistance were fully verified.
Further Reading:
Hello, Customers
My name is Van, I’m the business manager of HIFULL, I have been in Fumed Silica Industry for more than 10 years. Feel free to contact me. I’m happy to provide you the best service and products.
