Characteristics of white corundum as a wear-resistant additive for coatings and its role in coatings

Characteristics of white corundum as a wear-resistant additive for coatings and its role in coatings
As a wear-resistant additive for coatings, white corundum has significant advantages in improving the comprehensive performance of coatings due to its unique physical and chemical properties. The following are its main functions and application characteristics:
I. Core characteristics
‌High hardness‌
The Mohs hardness reaches 9.0 and the Vickers hardness is 2200-2400kg/mm², which can significantly enhance the scratch resistance of the coating surface.
‌Chemical inertness‌
Resistant to acid, alkali and solvent corrosion, suitable for harsh environments such as chemical industry and shipbuilding.
‌Thermal stability‌
High melting point (prepared by electric melting at 2200℃), maintaining structural stability at high temperatures.
II. Role in wear-resistant coatings
‌Improving wear resistance‌
By filling tiny pits and forming a uniform particle distribution, the coating’s ability to resist friction and wear is enhanced, which is suitable for high-wear scenarios such as floor coatings and automotive coatings.
‌Optimizing the mechanical properties of coatings‌
‌Adhesion‌: Fine particles enhance the bonding between the coating and the substrate and reduce the risk of peeling.
‌Hardness‌: Directly improve the macroscopic hardness of the coating and protect the substrate from impact damage.
‌Corrosion resistance and weather resistance‌
Chemical stability reduces acid and alkali erosion and extends the life of the coating in outdoor or corrosive environments.
‌Improved process adaptability‌
‌Flowability‌: The acid and water washing process optimizes the particle size concentration (such as D50 value) to facilitate uniform dispersion.
‌Appearance quality‌: Narrow particle size distribution ensures a smooth coating surface and high gloss.
Ⅲ. Technical parameter requirements ‌Particle size control‌: Commonly used 180#-3000# specifications, median D50 needs to strictly match the coating system.
‌Purity‌: The acid and alkali washing process reduces the impurity content and the pH value is neutral to avoid affecting the stability of the coating.
Through reasonable selection and formulation design, white corundum can significantly improve the durability and functionality of the coating to meet diverse industrial needs.