Curti Posted March 2, 2009 Share Posted March 2, 2009 Some steel comes from the foundry with an almost ultra thin ceramic coating that resists rust. It varies from a light to a dark grey. Can this coating be reproduced? I have found in the past that I have summarily painted parts black, when in reality the factory never did paint them. Link to comment Share on other sites More sharing options...
Bhigdog Posted March 2, 2009 Share Posted March 2, 2009 When steel is heated to red or higher heat in the atmosphere the surface oxidizes. It's called scale. That's what it looks like to me.......Bob Link to comment Share on other sites More sharing options...
nearchoclatetown Posted March 2, 2009 Share Posted March 2, 2009 Bhigdog is right, it is the carbon scale from being heated when made. Link to comment Share on other sites More sharing options...
Curti Posted March 2, 2009 Author Share Posted March 2, 2009 Thanks fellas. Now I know how it got there, all I have to do is figure out how to reproduce it. Maybe bead blast then parkerize fowllowed by a thin coat of dull clear. I am always trying to achive the original look. Link to comment Share on other sites More sharing options...
R Walling Posted March 2, 2009 Share Posted March 2, 2009 It could be a heavy coating of phosphate that will not allow the steel to rust. I had a truck that all the paint peeled of the roof once and there was not a spot of rust on it. I was told that if steel is left in a phosphate solution too long that occurs. Link to comment Share on other sites More sharing options...
Curti Posted March 2, 2009 Author Share Posted March 2, 2009 That begs the question, what is phosphate? Is it oxide of phospherous? Link to comment Share on other sites More sharing options...
Mark Shaw Posted March 3, 2009 Share Posted March 3, 2009 Phosphate is a mined mineral that can be used to produce phosphoric acic. This acid can be used to prepare bare steel for painting. It etches the metal to provide excellent adhesion and also serves as an excellent rust inhibitor. (See OSPHO)http://www.ospho.com/ Link to comment Share on other sites More sharing options...
Guest bkazmer Posted March 3, 2009 Share Posted March 3, 2009 and yes, it is a salt that is an oxide of phosphorus. Link to comment Share on other sites More sharing options...
Guest rickomo1 Posted March 6, 2009 Share Posted March 6, 2009 Read this a week or two ago and low and behold was in home depot and saw a product by Klean strip called Phosphoric Prep & Etch might be worth a try it states removes rust and prevents flash rust so it must leave a film or residew of some kind. about 6 bucks a quart. Link to comment Share on other sites More sharing options...
Mark Shaw Posted March 6, 2009 Share Posted March 6, 2009 Rick, Much less expensive than OSPHO...particularly when they charge extra for shipments west of the Rockies.....P.S.I see you are just across the river from me.... Link to comment Share on other sites More sharing options...
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