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Zinc plated components vary from one
industry to another. They share, however, the most basic of metal finishing
requirements: durable finish; aesthetically pleasant appearance; and cost
effec- tive processing.
The designer and engineer must take
into account several considerations to stay at the forefront of the finish
potential. Not the least of which is the environmental regulations impact
on the future of the selected finish.
Zinc
and Zinc alloys, such as zinc-nickel will surely play a more significant
role as metals such as Cadmium are destined for the elements' Valhalla.
Such sacrificial metals, as Zinc, have significant corrosion resistance
properties in spite of their apparent softness and propensity to
scratching. |
More extensive reading. |
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Zinc |
[ASTM-B633]
This specification covers requirements
for electrodeposited zinc coatings applied to iron or steel articles to
protect them from corrosion. It does not cover zinc-coated wire or sheets.
High strength steels (tensile strength greater than 1700 MPa) shall not
be electroplated. Stress relieve all parts with ultimate tensile strength
1000 MPa and above at minimum 190°C for 3 hours or more before cleaning
and plating. Hydrogen embrittlement relieve all electroplated parts of
1200 MPa tensile strength or higher by baking at 190°C for 3 hours
or more within 4 hours after electroplating.
Supplementary treatments shall be in
accordance with Recommended Practice B201. Type IV shall be in accordance
with Recommended Practice D2092. |
Corrosion
Resistance Requirements
| Types |
Test
Period (Hours.) |
| II |
96 |
| III |
12 |
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| To determine
the nature of accuracy or revision level please verify above data with
current releases:
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