Drywall Screws
#1
02-17-05, 08:09 PM
Drywall Screws
Was wondering what the glossy black coating is on drywall screws. Is it paint or an anti-corrosive coating? Thx.
#4
02-22-05, 03:38 PM
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Location: Asheboro, NC
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Drywall screws...or "hold anything" screws are covered with a plating called black oxide, and then dipped in a rust inhibitor called rust veto.
When metal corrodes, what you see is oxide...rust is red oxide.
Black oxide can be created with a chemical process, or by a steam process.
This gives the surface of the metal a layer of oxide, and since the surface of the metal already has an oxide layer…it helps to slow the start of the more common Red Oxide, it will not halt further corrosion, but it will stop red oxide in the short term.
When metal corrodes, what you see is oxide...rust is red oxide.
Black oxide can be created with a chemical process, or by a steam process.
This gives the surface of the metal a layer of oxide, and since the surface of the metal already has an oxide layer…it helps to slow the start of the more common Red Oxide, it will not halt further corrosion, but it will stop red oxide in the short term.
