Dalian Sandblasting: Surface Finish Selection Reference

Sandblasting in Dalian selects appropriate blasting solutions based on workpiece material, subsequent processes and appearance requirements. Abrasive impact creates uniform micro-textures on workpiece surfaces. Process parameters greatly affect surface finishes. Proper sandblasting can meet demands including rust removal, deburring, surface roughening and matte finishing. Define workpiece application and target surface condition before blasting.

Basic cleaning sandblasting is used for rust, scale and casting sand removal. Hard abrasives such as brown fused alumina and steel grit with large grain size deliver strong impact to strip heavy rust and oxide layers. Suitable for carbon steel and cast steel workpieces, it yields evenly rough metallic surfaces as pretreatment for painting and anti-corrosion coating to improve coating adhesion. In Dalian’s coastal environment, blasted fresh metal surfaces must be processed or rust-proofed promptly to prevent re-rusting.

Thin-walled aluminum and stainless steel workpieces requiring light deburring and oxide removal with controlled roughness adopt fine sandblasting with glass beads or fine white fused alumina. Gentle impact avoids workpiece deformation and produces fine matte finishes without deep pits, ideal for precision and decorative parts. Regulate blasting pressure; excessive pressure deforms thin parts. Conduct sampling tests to verify textures.

For workpieces requiring high roughness for bonding, such as rubber-bonded parts, medium-grain hard abrasives are used to form micro-undulations and enlarge contact areas for stronger adhesive bonding. Calculate roughness values and test samples; improper roughness impairs bonding stability.

Workpiece thickness is a key factor. Large-grain high-pressure blasting is unsuitable for thin sheets and castings due to deformation risk; low-pressure fine abrasives are preferred. Steel abrasives are recyclable to cut costs, while glass beads have high breakage and consumption. Select abrasives based on project budget.

Sandblasting finishes influence downstream processes. Workpieces for painting and powder coating focus on cleanliness and roughness. Decorative stainless steel parts prioritize uniform matte appearance and color consistency to avoid over-blasting. Request samples from manufacturers to check textures and roughness against drawings.

Environmental requirements shall also be considered. Dry and wet sandblasting are available. Wet blasting is preferred for sites with strict dust control to reduce dust emission. Select optimal sandblasting solutions by integrating workpiece material, wall thickness, target finish, follow-up processes, cost and environmental factors to satisfy technical specifications.