Changfu Chemical Colloidal Silica: Boosting the Shear and Corrosion Resistance of Aluminum Silver Powder

Adopting Changfu Chemical Nanosilica Sol to treat aluminum silver powder, the resulting composite coating not only fully leverages the shielding advantages of aluminum silver powder but also significantly enhances the overall protective performance of the coating by utilizing the excellent corrosion resistance of the silica sol. Although there are many challenges in the practical application of aluminum silver powder, Changfu Chemical Nanosilica Sol can effectively improve the shear and corrosion resistance of aluminum silver powder in the following ways.

Enhancing Shear Resistance

Forming a Dense Protective Film: During the drying process, nanosilica sol forms a dense silica film that encapsulates aluminum silver powder particles, reducing direct contact and friction between particles. Under shear stress, this protective film can effectively disperse stress, preventing deformation or breakage of aluminum silver powder particles due to excessive friction, thereby improving shear resistance.

Enhancing Particle Interactions: The silica nanoparticles in the nanosilica sol, with their high specific surface area and reactivity, can physically adsorb or chemically bond with the surface of aluminum silver powder. This interaction strengthens the interparticle forces, making the particles less likely to disperse or detach under shear stress, thus enhancing overall shear resistance.

Improving Dispersion: Nanosilica sol acts as a dispersant, ensuring uniform dispersion of aluminum silver powder in the system. Uniformly dispersed particles experience more even stress distribution under shear stress, reducing localized stress concentration and lowering the risk of particle damage due to excessive stress, thereby improving shear resistance.

Enhancing Corrosion Resistance

Physical Barrier Effect: The silica film formed by the silica sol effectively blocks corrosive media (such as water, oxygen, chloride ions, etc.) from contacting aluminum silver powder. This physical barrier significantly slows down the corrosion rate of aluminum silver powder, extending its service life.

Chemical Stability: The silica in the silica sol exhibits excellent chemical stability and is less reactive with corrosive media. Even in corrosive environments, the silica film remains relatively stable, providing continuous protection to aluminum silver powder and enhancing its corrosion resistance.

Product Specifications

Solvent Options: Methanol, ethanol, isopropanol, water

Particle Size: 15±5 nm (other sizes available)

Solid Content: 30% wt

Packaging: 25 kg PE drums