Technical data

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Comparison of Zinc Plating, Zn-Ni plating and Zn-Flake Coating
Zn plating + Chromate
Zn-Ni Plating + Chromate
Zinc Flake Coating
Advantages
  • Low cost
  • Good appearance
  • Better corrosion resistance compared to Zn plating
  • NSST: 1000hrs at 15㎛, with Chromate treatment
  • Good appearance
  • High ardness of plating layer
  • High corrosion resistance at lower thickness (8㎛ : NSST 1000hrs.)
  • No hydrogen embrittlement
  • Simple coating process
  • No waste water
  • Good resistance to galvanic corrosion
  • No harmful heavy metal (Cr, Ni, ect)
  • High heat resistance
Weakness
  • Low corrosion resistacne
  • Waste water
  • Weak wear resistance
  • Hydrogen embrittlement risk
  • Complicated coating process
  • Weak to humidity
  • Chromate treatment required for corrosion resistance
  • Waste water
  • Ni ion releasing risk
  • Hydogen embrittlement risk
  • Complicated coating process
  • High cost
  • High curing Temperature(250~340℃)
  • Relatively poor appearance
  • Lower hardness than Zn-Ni plating
Zn plating + Chromate
Advantages
  • Low cost
  • Good appearance
Weakness
  • Low corrosion resistacne
  • Waste water
  • Weak wear resistance
  • Hydrogen embrittlement risk
  • Complicated coating process
  • Weak to humidity
Zn-Ni Plating + Chromate
Advantages
  • Better corrosion resistance compared to Zn plating
  • NSST: 1000hrs at 15㎛, with Chromate treatment
  • Good appearance
  • High ardness of plating layer
Weakness
  • Chromate treatment required for corrosion resistance
  • Waste water
  • Ni ion releasing risk
  • Hydogen embrittlement risk
  • Complicated coating process
  • High cost
Zinc Flake Coating
Advantages
  • High corrosion resistance at lower thickness (8㎛ : NSST 1000hrs.)
  • No hydrogen embrittlement
  • Simple coating process
  • No waste water
  • Good resistance to galvanic corrosion
  • No harmful heavy metal (Cr, Ni, ect)
  • High heat resistance
Weakness
  • High curing Temperature(250~340℃)
  • Relatively poor appearance
  • Lower hardness than Zn-Ni plating
Zn-Al Flake Coating Anticorrosion Mechanisms
Corrosion
resistance
Sacrificed
Protection
Passivation
Self healing
Effect
Baarrier
Effect
GEOCOTE™ Base Coat Anticorrosion Mechanisms
Sacrificed Protection
  • It is a sacrificial protection structure that protects iron material by preventing ionization of iron by firstly oxidizing Zn and Al which have higher ionization tendency than iron material.
Passivation
  • Plating is when Zn is oxidized, Zn is converted to ZnO and the plating layer disappears.
  • In the case of S-570, the binder component contains oxides of Zn and Al and forms a metal oxide layer (passivation film) on the surface of the coating film
  • Further, since the binder component surrounds the surfaces of Zn and Al, there is also an effect of retarding the oxidation of Zn and Al.
Barrier effect
  • Zinc flake coating structure makes it more difficult for the aggressive substances such O2, H2O, NaCl, etc..to reach the steel surface (longer way)
Self healing effect
  • The oxide of Zn and Al expands more than before the oxidation, and the oxide reacts with the binder component to complement the binding site.
GEOCOTE™ MT, RT
Zinc-Al Flake Coating
  • Thermal curing System (250~360°C Baking)
  • Dip-Spin or Spray, 2Coating 2Baking
GEOCOTE™ MT
  • Room temperature curing System
  • Lacquer or Spray