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Long Range Hunting & Shooting
CLR and Chrome Moly Barrels
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<blockquote data-quote="Bob Wright" data-source="post: 2617286" data-attributes="member: 104363"><p>Passivation is a process used to remove "free iron" from the surface of certain stainless steels. It aids in adding a very thin layer of a "passive" surface, stopping the conversion of iron to iron oxide (rust). </p><p>If the chemicals in CLR (calcium, lime, rust) can remove iron oxide, you can bet in an uncontrolled soaking in CLR will remove the iron in the stainless steel chemistry. </p><p>Those "white spots" in the bore may be pits left from removal of iron. They are there until the bore wears enough to remove the pits, depending on how deep the pits are.</p><p>I would think CLR would really be aggressive on a steel barrel, hence how it removes bluing while you watch.</p><p>Nitric or citric acid are two of the chemicals commonly used to leach free iron out of the surface in passivation.</p></blockquote><p></p>
[QUOTE="Bob Wright, post: 2617286, member: 104363"] Passivation is a process used to remove "free iron" from the surface of certain stainless steels. It aids in adding a very thin layer of a "passive" surface, stopping the conversion of iron to iron oxide (rust). If the chemicals in CLR (calcium, lime, rust) can remove iron oxide, you can bet in an uncontrolled soaking in CLR will remove the iron in the stainless steel chemistry. Those "white spots" in the bore may be pits left from removal of iron. They are there until the bore wears enough to remove the pits, depending on how deep the pits are. I would think CLR would really be aggressive on a steel barrel, hence how it removes bluing while you watch. Nitric or citric acid are two of the chemicals commonly used to leach free iron out of the surface in passivation. [/QUOTE]
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