Zinc Thermal Diffusion
Expert corrosion protection for lasting durability.
ZincThermal Diffusion
Zinc thermal diffusion, also known as zinc diffusion coating, is a method that embeds zinc into the surface of steel components. This process involves heating the steel in a zinc-rich environment, allowing the zinc to diffuse into the substrate. The result is a metallurgically bonded layer of zinc that provides exceptional corrosion resistance while maintaining the structural integrity of the steel. This technique is particularly beneficial for components exposed to harsh environments, offering long-lasting protection and reducing maintenance costs over time.
- Coating thickness
- 25–100 µm
- Bond
- Zinc-iron alloy, diffused
- Part size
- 10 mm – 3 m
- Embrittlement risk
- None
Superior Corrosion Protection
Forms a durable zinc-iron alloy layer that won't flake or chip.
Long-Lasting Durability
Ideal for components exposed to harsh or corrosive environments.
Environmentally Friendly
No toxic by-products or hazardous waste.
Trusted in Critical Applications
Widely used in automotive, construction, and heavy-duty industries.
Why It Matters
Zinc thermal diffusion provides exceptional corrosion protection by forming a tightly bonded zinc-iron alloy layer on the surface of metal parts. Unlike traditional coatings, this process doesn't flake, chip, or crack—making it ideal for harsh environments. It offers long-term durability, uniform coverage (even in threads and complex geometries), and is environmentally friendly, with no toxic by-products. This makes it a reliable choice for critical components in automotive, construction, and heavy-duty industries.
The Process, Step by Step
- 1
Clean & prepare
Components are cleaned and blasted so the surface is ready for diffusion.
- 2
Load with zinc powder
Parts are sealed in a drum with a zinc-rich powder mix.
- 3
Heat & diffuse
The drum is heated and rotated so zinc diffuses into the steel, forming a zinc-iron alloy layer.
- 4
Finish & certify
Parts are cooled, passivated where required, and released with SANS 53811 certification.
Zinc Thermal Diffusion FAQs
Other Services
All ServicesRack Electroplating
Components are individually racked and zinc plated for even coverage on complex or large parts up to 3 m.
Find Out MoreBarrel Electroplating
Small parts tumble in a rotating barrel of zinc electrolyte — the fastest route to protect fasteners in volume.
Find Out MoreHot Dip Spinning Galvanizing
Hot dip galvanizing for small components — bulk hardware is dipped in molten zinc and spun to clear the excess, leaving thick, even protection and usable threads.
Find Out MoreGet a Zinc Thermal Diffusion Quote
Send your part details and quantities and we come back with a costed quote, the recommended finish and a firm lead time — free and with no obligation.