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In most of the world, sheet metal thickness is consistently specified in millimeters. In the U.S., the thickness of sheet metal is commonly specified by a traditional, non-linear measure known as its gauge. The larger the gauge number, the thinner the metal. Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge.
Immersion zinc plating is an electroless (non-electrolytic) coating process that deposits a thin layer of zinc on a less electronegative metal, by immersion in a solution containing a zinc or zincate ions, Zn(OH) 2− 4. A typical use is plating aluminum with zinc prior to electrolytic or electroless nickel plating.
Zinc-aluminium (ZA) alloys are alloys whose main constituents are zinc and aluminium. Other alloying elements include magnesium and copper . This type of alloy was originally developed for gravity casting .
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Mechanical plating, also known as peen plating, mechanical deposition, or impact plating, is a plating process that imparts the coating by cold welding fine metal particles to a workpiece. Mechanical galvanization is the same process, but applies to coatings that are thicker than 0.001 in (0.025 mm). [ 1 ]
Zinc flake coatings create what is known as cathodic protection: the less noble zinc 'sacrifices' itself in order to protect the underlying metal. Steel can be protected in this way. The coating thickness is often between 5 μm and 15 μm, with thicker layers also possible where there are special requirements.
The British, European and International standard for hot-dip galvanizing is BS EN ISO 1461, which specifies a minimum coating thickness to be applied to steel in relation to the steels section thickness e.g. a steel fabrication with a section size thicker than 6 mm shall have a minimum galvanized coating thickness of 85 μm.
Cold-rolled carbon structural steel sheet A611 A 25 42 1.68 26 B 30 45 1.50 24 C 33 48 1.45 22 D 40 52 1.30 20 Zinc-coated or zinc-iron alloy-coated steel sheet A653 SS Gr. 33 33 45 1.36 20 Gr. 37 37 52 1.41 18 Gr. 40 40 55 1.38 16 50 Class 1 50 65 1.30 12 50 Class 3 50 70 1.40 12 HSLAS Type A 50 50 60 1.20 20 60 60 70 1.17 16 70 70 80 1.14 12 80
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