Comparison : Why Better Zinc Aluminium Flake Coating vs Other Plating



Detail Zinc Al Flake Hot Dip Galvanise Zinc-Nical Plating Zinc Plating Zinc-Iron Plating
life as per ASTM B
117
500 to 1500 Hrs 500 to 800 Hrs 450 to 800 Hrs 80 to 250 Hrs 200 - 450 Hrs
Coating Thickness 8 to 15 Microns

50 to 100 Microns.
( For HDG, High Coating thickness requires retaping / rethreading )

8 to 15 Microns 8 to 15 Microns 8 to 15 Microns
Coating behavior Gives barrier +
sacrificial
protection
Gives only sacrificial
protection ( ZFC has better Corrosion Protection )
Gives Barrier +
Sacrificial Protection
Gives only Sacrificial
Protection
Gives only Sacrificial
Protection
Control of
coefficient of
friction
COF can be
controlled in narrow
range from 0.08 to
0.25
No controlled COF No controlled COF or
plated surface
No controlled COF on
plated surface
No controlled COF on
plated surface
Compatibility for
Top Coats
Compatible with
most of Top Coats
Not compatible with Top
Coats
Not compatible with Top Coats Not compatible with Top Coats Not compatible with Top Coats
Compliance with
Environmental
Standards
Meets with all
Standards
Limited compliance with
Standards.
Limited compliance with
Standards.
Limited compliance with
Standards.
Limited compliance with
Standards.
UV resistance Resistant to UV Poor UV Resistance Poor UV Resistance Poor UV Resistance Poor UV Resistance
Fluid Resistance Resistant to Fluids Poor Fluids Resistant Poor Fluids Resistant Poor Fluids Resistant Poor Fluids Resistant
Environmental
Impact
Negligible Pollution
During Processing
High Pollution Puring
Processing
Highly Polluting
Process
Highly Polluting
Process
Highly Polluting
Process
Processing
Temperature
200 to 350°C 400 to 450°C 50 to 60°C 50 to 60°C 50 to 60°C
Heat Resistance upto 350°C upto 200°C upto 200°C upto 200°C upto 200°C
Coating thickness
variation
2 to 3 microns 20 to 30 microns 2 to 3 microns 2 to 3 microns 2 to 3 microns
Pretreatment Dry Acid (for HDG, Hydrogen
pickup possible for high
tensile fasteners.)
Acid (for HDG, Hydrogen pickup possible for high tensile fasteners.) Acid (for HDG, Hydrogen pickup possible for high tensile fasteners.) Acid (for HDG, Hydrogen pickup possible for high tensile fasteners.)
Suitability for heat
treated steels.
Suitable Not Suitable.
(HDG - Hardness drop for
Hardened steels.)
Not Suitable for
hardened parts.
(Hydrogen pickup
possible)
Not Suitable for
hardened parts.
(Hydrogen pickup
possible)
Not Suitable for
hardened parts.
(Hydrogen pickup
possible)
coating
appearance
Good Poor Good Good Good
coating hardness Better coating
hardness
less coating hardness Better Better Better

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