Q:What effect does mechanical polishing have on roughness?
A:Reduce roughness: Make the surface smooth by removing surface protrusions or burrs.
Applicable scenarios: Parts with high requirements for appearance (such as decorative parts, medical devices).
Risk: Excessive polishing may damage the zinc coating and reduce corrosion resistance.
Q:How does sandblasting affect roughness?
A:Increased roughness: Sand impact will form pits or textures on the surface.
Applicable scenarios: Workpieces that need to enhance coating adhesion (such as subsequent painting or spraying).
Parameter influence: The larger the sand particle size and the higher the injection pressure, the more significant the increase in roughness.
Q:What effect does roller burnishing have on roughness?
A:Process principle: Put the workpiece and abrasive (such as ceramics, plastic particles) into a drum or vibrating equipment to remove burrs through collision and friction.
Impact on roughness: Reduce roughness: Suitable for small and medium-sized parts, can remove slight burrs and refine the surface.
Features: Good uniformity, suitable for complex shape workpieces.
Q:What effect does chemical polishing have on roughness?
A:Reduce roughness: A mirror effect can be obtained, but the uniformity depends on the solution concentration and time control.
Risk: The process parameters need to be strictly controlled, otherwise it may cause excessive corrosion.
Q:What effect does passivation have on roughness?
A:Process principle: A passivation film is formed on the surface through chromate or chromium-free passivation agent.
Impact on roughness: Slight impact: The passivation film itself is very thin (usually < 1μm), which has little impact on roughness, but may fill some microscopic pits and make the surface slightly smoother.
Exception: If the passivation solution contains granular additives (such as some silane treatment agents), it may slightly increase the roughness.