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Hollymetal® |
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Hollymetal®
is an alloy consisting of zinc and tin.
Zinc provides sacrificial protection, and tin is generally used as a
barrier coat. The alloy of these two metals provides superior
corrosion resistance. The tin inhibits the corrosion of the zinc,
which in turn inhibits the corrosion of the part itself. Corrosion
resistance is much higher with
Hollymetal®
composition is usually offered in
80/20 and 75/25 although it can be varied for certain applications.
This coating complies with AS3566
Class 4.
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Salt Spray Resistance
The following table shows
hours to red rust for various thicknesses of Hollymetal®
when subjected to Accelerated
Corrosion tests using a 5% Neutral Salt Spray test in a cabinet to
AS2331.3.1-1980
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Coating |
Thickness |
Hours
to Red Rust |
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Hollymetal® |
10 micron |
300 |
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Hollymetal® |
15 micron |
500 |
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Hollymetal®
(Class AS 3566) |
25 micron |
1000 |
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Hollymetal®
(Class 4 AS 3566) |
45 micron |
3000 |
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Hot Dip Galvanising** |
42 micron |
350 |
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**
As a comparison Hot Dip
galvanising generally last 350 hours before red rust, in the
same tests Salt Spray tests are shape specific and results may
vary. |
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Substrates that
can be plated |
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Carbon Steel |
Sintered Iron (Powder
metallurgy) |
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Some Malleable & Modular Iron |
High Carbon Heat Treated
Steel |
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Copper |
Various Tool Steels |
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High Strength Alloys |
Bronze |
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Lead |
Free Machining steel
(inc. Leaded) |
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Nitrided Steels |
Cold Rolled Steel |
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Cast Iron |
Brass |
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Some Stainless Steels |
Zinc diecastings |
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Galvacoat
This is a heavy Zinc coating that
we are able to control with complete accuracy in the thickness
range from 25-125 microns, depending on customers' requirements
with no hydrogen embittlement. This coating will comply with
Australian Standards on " hot-Dipped Galvanising" AS 1214-1983
and AS 1650-1981, which calls for a minimum thickness of 42
microns. The threads are "lump and dag" free and none of
the components are stuck together.
Suitability
Environment where Galvacoat can
be applied
Components suitable for Galvacoat
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Stangal
Stangal is a multi-purpose
coating! This is an alloy of Zinc and Tin with a Tin overlay as
a barrier coating which will be more durable in extreme
corrosion environments. Salt Spray Resistance of 1000 hours
duration for a 10 micron thick coating to 2000hrs for a 15
micron coating are possible, and Salt Spray Resistance of up to
3000 hrs can be offered depending on the thickness of coating
applied.
Suitability
Environment where Stangal can be
applied
Components suitable for Stangal
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Mechanical Zinc & Clear Chromate and Yellow Chromate
These coatings will give you the
same "Salt Spray" resistance as the equivalent electroplated
coatings but with No Hydrogen embrittlement on Hi-Tensile Steel.
Available with exactly the thickness your require from 5 - 25
microns. The thicker coatings will substantially increase
corrosion protection at negligible cost
Suitability
Environment where Clear Chromate
& Yellow Chromate can be applied
Components suitable for Chromate
coatings
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