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Rifles, Reloading, Optics, Equipment
Gunsmithing
Sandblasted SS treatment afterwards??
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<blockquote data-quote="ntsqd" data-source="post: 1908027" data-attributes="member: 93138"><p>Assuming that the are no impinged iron particles in the surface of the SS the chromium in the alloy will do what it does on car bumpers, form an invisible oxide layer that seals the surface to further corrosion.</p><p></p><p>When SS is machined iron gets impinged. Doesn't seem to matter that only carbide tooling and no steel tooling was used in the machining of it, given the opportunity it will rust at least a little. I once cleaned a SS Mini-14 that was used on a commercial fishing boat. It was a nasty, pitted mess from all of the blood that got on it and wasn't cleaned off, even on the surfaces that were as-cast unmachined SS. Blood is a "super-oxidizer".</p><p></p><p>The way to remove those impinged iron particles is a process called "Passivation" and it employs varitaions on a nitric acid bath to remove the iron from the surface. In the process the surface has a similar invisible layer formed on it that seals the metal from further corrosion. Attached is the old US MIL-Spec for this process.</p><p></p><p>EDIT: I should mention that passivation results in a surface finish that looks "frosted" in most cases.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 1908027, member: 93138"] Assuming that the are no impinged iron particles in the surface of the SS the chromium in the alloy will do what it does on car bumpers, form an invisible oxide layer that seals the surface to further corrosion. When SS is machined iron gets impinged. Doesn't seem to matter that only carbide tooling and no steel tooling was used in the machining of it, given the opportunity it will rust at least a little. I once cleaned a SS Mini-14 that was used on a commercial fishing boat. It was a nasty, pitted mess from all of the blood that got on it and wasn't cleaned off, even on the surfaces that were as-cast unmachined SS. Blood is a "super-oxidizer". The way to remove those impinged iron particles is a process called "Passivation" and it employs varitaions on a nitric acid bath to remove the iron from the surface. In the process the surface has a similar invisible layer formed on it that seals the metal from further corrosion. Attached is the old US MIL-Spec for this process. EDIT: I should mention that passivation results in a surface finish that looks "frosted" in most cases. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Sandblasted SS treatment afterwards??
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