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Post by Gary @ R&G on Oct 19, 2009 16:38:24 GMT -5
Anybody had a stainless Ruger corrode? I just bought a 1978 prewarning stainless S6 with a corrosion that looks like rust but black. Primarily on the gripframe but light specs on the cylinder frame. I think OOOO and oil with take it off but never seen it before. I will post some pics later.   |
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Post by inFALable on Oct 19, 2009 17:59:15 GMT -5
Are they not casting flaws? They usually have a dark spot at the base. I've had many SS Smiths rust under the grips.
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Otony
.327 Meteor
Posts: 722
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Post by Otony on Oct 19, 2009 18:32:22 GMT -5
Remember, it is stainLESS, not stainFREE.
Stainless will rust, you betcha. I have had both Ruger and S&W stainless guns rust.
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Post by Mark Terry on Oct 19, 2009 20:46:08 GMT -5
I don't have any experience with blck rust but I can confirm that regular red rust will form on the surface of virtually any stainless steel that's brushed with carbon steel brushes, stainless steel brushes or grinding media that's been used on carbon steel. Very fine particles will embed in the surface and, as you'd expect, rust.
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Post by Gary @ R&G on Oct 19, 2009 21:30:43 GMT -5
This looked almost like a stain as well as rust. A little work with 400 grit and it looks almost like new now.
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Post by naphtali on Oct 20, 2009 10:42:43 GMT -5
Gary:
After you passivate the corroded area, or mechanically remove the corrosion, the corrosion resistant property of the 4xx series alloy will return. This property is a result of the steel having a continuous barrier a couple of molecules deep of chromium oxide. In the presence of oxygen, this barrier is constantly and immediately renewed -- that is, polish the steel, rub it, scrape it and the barrier is removed. But them instantly renewed. The barrier inhibits corrosion by known ability. I think I have scanned Carpenter Technology's table of stainless steels' corrosion resistance if this excruciating detail is needed.
Hope this helps.
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RpR
.30 Stingray
Posts: 196
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Post by RpR on Oct 20, 2009 16:20:33 GMT -5
Gunsmithing instructors used to tell us the term Stain-resistant, is far better than Stain-less.
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Post by Gary @ R&G on Oct 21, 2009 8:02:35 GMT -5
naphtali you officially gave me brain damage. You have to use the KISS principle with us cops.
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Post by naphtali on Oct 21, 2009 11:28:19 GMT -5
naphtali you officially gave me brain damage. You have to use the KISS principle with us cops. 4xx series stainless steels are corrosion resistant because of a plating built into the material. In air, the plating cannot be removed. If the plating has been overcome by the corrosive element, clean away or neutralize the crud, and the plating returns. Not as accurate, but maybe better?? |
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Post by Gary @ R&G on Oct 21, 2009 12:46:46 GMT -5
better for us simple ones.
Thanks!
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Post by madcratebuilder on Oct 21, 2009 13:04:54 GMT -5
I recently bought a S&W 686 because it had a lot of corrosion on it. Side plate and trigger guard looked bad. I was able to get all put one or two very tiny pits out of it, had to replace three screws. Worth the effort as I bought at twenty cents on the dollar. I think the corrosion was caused by being in a leather holster, stored onboard a boat in a saltwater bay.
I had a similar experience with a ROA, it cleaned up and polished out better than new. As long as the pits are not very deep they well clean up to look good or better.
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