1.What is the process principle of mechanical galvanizing?
The rotation of the drum causes mechanical collision between the workpiece, zinc powder, activator (such as ammonium chloride, zinc chloride solution) and impact medium (such as glass beads). The zinc powder is deposited on the surface of the workpiece to form a coating. No electricity is required, which is called "electroless galvanizing".
2.What are the core advantages of mechanical galvanizing?
Environmental protection: There is no strong acid, strong alkali or heavy metal pollution during the electroplating process, the wastewater treatment cost is low, and it complies with environmental regulations.
Low temperature adaptability: The process temperature is usually lower than 100℃, which avoids the strength loss of high carbon steel, spring steel and other materials due to high temperature annealing, and is suitable for parts sensitive to heat treatment.
Uniformity and deep plating ability: The rotation of the drum makes the coating evenly cover the workpiece with complex geometry, avoiding the uneven coating thickness caused by the "tip effect" in electroplating.
No risk of hydrogen embrittlement: No need for electrodeposition, avoiding hydrogen atoms from penetrating into the metal matrix, suitable for hydrogen embrittlement sensitive parts such as high-strength steel and spring parts.
3.What are the applicable scenarios for mechanical galvanizing process?
Anti-corrosion of high-strength metal parts
Automotive industry: chassis bolts, suspension springs, engine high-strength bolts, to avoid the risk of fracture caused by hydrogen embrittlement.
Moving parts such as door hinges and seat rails, the uniformity of the coating ensures long-term wear resistance and corrosion resistance.
Aerospace: Surface corrosion protection of aluminum alloy fasteners and titanium alloy parts. Low temperature process does not affect the mechanical properties of the matrix.
Electronic and mechanical parts: Electronic component housings with blind holes, miniature bearings, precision gears, the coating can penetrate into tiny gaps.
Pipe fittings, internal threads of hydraulic parts, avoid the problem of no coating on the inner wall caused by "insufficient deep plating capacity" in traditional electroplating.
Hardware products: chains, springs, stampings, roller technology ensures consistent coating thickness at corners and edges.
Medical devices: surface corrosion protection of surgical instruments and implants (such as titanium alloy bone screws), without the risk of heavy metal residues.
4.What are the application environments in outdoor and harsh environments?
Power and communication equipment: Transmission tower bolts, communication base station fasteners, resistant to atmospheric corrosion (such as acid rain, salt spray), and welding sparks during maintenance do not affect the coating (hot-dip galvanizing is prone to peeling when exposed to high temperatures).
Marine engineering: Ship deck fasteners, port facility connectors. Although the corrosion resistance is slightly lower than that of zinc-aluminum-magnesium coating, the cost is lower and it is suitable for moderately corrosive environments (such as offshore areas).
5.What are the scenarios for replacing traditional galvanizing?
For materials sensitive to hydrogen embrittlement: knives and molds made of spring steel and high-carbon steel, mechanical galvanizing can completely replace electrogalvanizing to avoid the risk of breakage.
Small batch and multi-variety parts: customized mechanical parts, sample parts, flexible drum process, no need to adjust the plating tank, suitable for small batch production.