ZG-Five different types of chromium-free treatments

ZAM® Five different types of chromium-free treatments-ZG treatment

ZG treatment
Chromium-free organic special treatment

① Reducing damage during processing

It is expected that this processing reduces damage to the coating layer during roll forming or press working.

② Superior corrosion resistance

The special film provides better corrosion resistance both on flat and bent parts.

③ Excellent fingerprint resistance

Fingerprints left during handling are hardly noticeable.

④ Superior compatibility with the environment

The resultant material is friendly to the environment because its film is entirely free of chromium.

Quality characteristics

Treatment	Elution of chromium	Corrosion resistance	Scratch resistance	Contact resistance (grounded)	Fingerprint resistance	Alkali resistance	Solvent resistance
ZG treatment	No elution	SST240h, white rust occurrence 10% or less		∞	ΔL≤0.5
ZC treatment	No elution	SST72h, white rust occurrence 10% or less		10-5〜10-4Ω	ΔL≤1.0

Elution of chromium: Amount of chromium elution measured after the specimen has been immersed for 3 minutes in boiling water
Corrosion resistance: Salt spray test (JIS Z2371)
Scratch resistance: Appearance of the coating layer during processing
Contact resistance value: Measured by the four-terminal, four-probe method (Dia Instruments MCP-TPO3P)

Fingerprint resistance: Difference in brightness (ΔL) before and after impression with artificial finger-smudge solution (JIS K2246)
Alkali resistance: Appearance after immersion for 2 minutes in alkali degreasing agent (Nippon Paint SD-270) adjusted to pH of 12 and a temperature of 40°C
Solvent resistance: Appearance after immersion for 2 minutes in acetone
(Evaluation standard for alkali resistance and solvent resistance/ ○ : No change, △ : Some discoloration, × : Film peeling)

Appearances after salt spray test