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New surface treatment codes

According to ISO 4042/2081 DIN 267/9: A2 L
According to SS: 3191/2968 Fe/Zn 5 c
2.

ISO 4042/2081

(Source DIN 267/9)

Standardized coating thicknesses and designations
SS 3191/2968
Coating thickness µm
Designation
Bright chromating
Yellow chromationg
Green chromating
Black chromating
Without chromating
5
Fe/Zn 5 C1
Fe/Zn 5 C2
Fe/Zn 5 C3
Fe/Zn 5 C4
Fe/Zn 5
8
Fe/Zn 8 C1
Fe/Zn 8 C2
Fe/Zn 8 C3
Fe/Zn 8 C4
Fe/Zn 8
12
Fe/Zn 12 C1
Fe/Zn 12 C2
Fe/Zn 12 C3
Fe/Zn 12 C4
Fe/Zn 12
15
Fe/Zn 15 C1
Fe/Zn 15 C2
Fe/Zn 15 C3
Fe/Zn 15 C4
Fe/Zn 15
20
Fe/Zn 20 C1
Fe/Zn 20 C2
Fe/Zn 20 C3
Fe/Zn 20 C4
Fe/Zn 20
25
Fe/Zn 25 C1
Fe/Zn 25 C2
Fe/Zn 25 C3
Fe/Zn 25 C4
Fe/Zn 25


The designation comprises:

a) the chemical symbol Fe, for the basis metal (iron or steel) followed by an oblique stroke, Fe/
b) the chemical symbol for zinc, Zn
c) a number indicating the minimum thickness, in micrometers, of the zinc coating
d) symbols indicating the designation of the chromate conversion coating where:

C1 = bright chromating
C2 = yellow chromating
C3 = green chromating
C4 = black chromating

(Source SS 3191/2968)

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