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Special triple gRey.coat coating protects steel components against harmful environmental
phenomena, as: acid rain, salt contamination etc.
gRey.coat layers t:1000h:
Special features of gRey.coating t: 1000h:
• very high resistance to salt, water, chemicals, weather changes, etc.
• resistance to high temperatures, up to 200°C
• the highest resistance to corrosive gases
• salt chamber test up to 1000 h
• absence of corrosion, even in case of contact with other metals (galvanic corrosion) firmly
adheres even to elements of complex shapes
• ceramic coating fends off red corrosion
• the film causes the porosity of zinc, which adheres to the ceramic outer coating
Triple corrosion protection
NZ
Not recommended
A
Fastener does not affect faster corrosion of the structure
B
Fastener slightly increases the corrosion rate of the structure
C
Fastener slightly increases the corrosion rate of the structure
D
Fastener surface is rapidly destroyed. The fastener remains without corrosion protection
E
Substrate material increases the corrosion of the fastener.
* The specificity of environment and other types of additional coatings may alter the activity of corrosion
Structure
Material
fastener material
Zinc-coated steel/
Galvanized steel
Aluminum and
aluminum alloys
Steel and cast
iron
Stainless martensitic
steel (410)
Stainless martensitic
steel
(410)
Austenitic
stainless steel
(302/304,303,305)
Zinc-coated steel/
Galvanized steel
A
B
B
C
C
C
Aluminum and
aluminum alloys
A
A
B
C
NZ
B
Steel and cast iron
A
D
A
A
C
C
B
Brass, copper, bronze,
monel
A
D
E
AE
AE
A
A
B
Ferritic stainless steel
(430)
A
D
E
AE
AE
A
A
A
Austenitic stainless
steel (302/304)
A
D
E
AE
AE
AE
A
A
Table No. 2 Selection of fasteners due to galvanic corrosion*
CORROSION AND PROTECTIVE COATING
baked top ceramic layer,
approx. 5 μm
chemical film, 1 μm
zinc layer, 4 μm
DIN 1.1133 steel