ZTD Coat® (Sherardising) service from Impreglon UK
Zinc thermal diffusion (ZTD Coat®) is the name given by Impreglon to its latest generation Sherardising process.
The big advantage of ZTD over traditional Sherardising is that the Zinc/Iron alloy that is created at the surface of the substrate is very consistent and uniform.
ZTD is a state of the art corrosion protection process of premium quality, whereby the surface of the material is modified by metallurgical vapour deposition. The resulting protective layer forms an extremely strong bond with the steel substrate and thereby ensures excellent long-term corrosion protection.
ZTD coating is an environmentally friendly process without the use of chromium VI.
The ZTD process is carried out in a closed system. The steel component to be treated is heated in an airtight container with a modified Zinc powder.
The Zinc evaporates, diffusing into the steel component forming Zinc/Iron phases. Unlike the old fashioned Sherardising process, a ballast material is not required. This means larger parts can be coated.
The thermal diffusion process allows the application of layer thicknesses between 20 and 120 ï¿½m, which can be left as they are or are ideally suited as primer layers for subsequent painting or coating. The smooth surface has significantly better wear resistance and corrosion resistance than for hot-dip galvanising. It also has excellent lubricity.
The Zinc thermal diffusion process in combination with wet painting or powder coating allows the creation of a highly corrosion resistant surface in almost any colour.
Long-term corrosion protection up to 350oC.
Over 1,000 hours salt spray test without top coat.
More than 5,000 salt spray test when overcoated with Xylan.
Layer thickness usually 20 microns but can be built up to 120 microns.
Uniform layer thickness, even with complicated geometries.
No Hydrogen embrittlement.
Good fatigue strength.
Impact resistance with no chipping.
ZTD Coat® is used extensively in the oil & gas, railway, mining, construction and automotive industries and everywhere where excellent corrosion protection is combined with functional and decorative properties.
The Impreglon Group fulfils all specifications pertaining to international automobile manufacturers.
For further information on our ZTD Coat® service contact Impreglon UK on 01827 871400.