Abstract： AS 1789:2003 pdf download.Electroplated zinc (electrogalvanized)coatings on ferrous articles (batch process). 5 COATING SYSTEM 5.1 Basic system A typical coating system for ferrous articles comprises— (a) a zinc coating applied by a batch...
AS 1789:2003 pdf download.Electroplated zinc (electrogalvanized)coatings on ferrous articles (batch process).
5 COATING SYSTEM
5.1 Basic system
A typical coating system for ferrous articles comprises—
(a) a zinc coating applied by a batch electroplating (electrogakanizing) process:
(b) a supplementary chromate con%ersion coating or other passivation system: and
(c) an optional organic/inorganic coating.
Table 1 specifies the preferred zinc coatings. Hosever, other coating specifications (zinc thicknesses) are permitted by
negotiation between electroplater and purchaser or. in the case of ferrous commodities destined to be sold on the open market, at
the discretion of the manufacturer concerned, but with the proviso that in no case shall any coating less than 5 micrometres
minimum local thickness be permitted.
Where a zinc coating other than the prefrred thicknesses listed in Table I is decided upon and agreed by the interested parties,
the coating classification shall he analogous to those shown. e.g. for a 7 micrometre minimum local thickness, the coating
classification becomes Fe/Zn 7.
A chroinate conersion coating. complying itli the requirements of Table 2 shall be applied to the zinc coating. However, the
chroinate conversion coating may he omitted. or replaced by another passivation system, but only at the specific request of the
purchaser.
5.2 Supplementary systeni
An organic or inorganic coating, such as a clear lacquer. ina he applied for additional corrosion protection. either by agreement
between interested parties or, if the commodity is offered for general sale, at the manufacturer’s discretion.
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