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Rifles, Reloading, Optics, Equipment
Reloading
Does Brass Dry Out???
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<blockquote data-quote="tim_w" data-source="post: 1350046" data-attributes="member: 11132"><p>Maybe the best term is corrosion cracking which is causes by de-zinicification?</p><p></p><p>Here is a write up on it</p><p></p><p><a href="http://www.nace.org/Corrosion-Central/Corrosion-101/Dezincification/" target="_blank">http://www.nace.org/Corrosion-Central/Corrosion-101/Dezincification/</a></p><p></p><p>Takes a alkaline or acidic bath which could easily be cause by gun powder residue or break down with loaded rounds as well. It use to be seen sooner before manf properly annealed the necks. In general my guess would be say 10 yrs you can count on it being good in most any conditions after that at varying degrees you are getting hardening via the conversion and loss of zinc in the alloy.</p><p></p><p>This also speaks of it directly in its effects on ammuntion and not just brass alloy in general.</p><p>ASTM International publication STPA64 "Protective Resin Films In Cartridge Brass" based on studies at Frankford Arsenal.</p><p></p><p>So want to give it a term I would say corrosion aging or cracking but corrosion something....... seems like the best name as age is not the given but actual environmental and powder breakdown.</p><p></p><p>I bet if a cases that were thoroughly cleaned sized and annealed and put in air tight vaccum sealed bags and kept would not have these issues over long periods of time.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1350046, member: 11132"] Maybe the best term is corrosion cracking which is causes by de-zinicification? Here is a write up on it [URL]http://www.nace.org/Corrosion-Central/Corrosion-101/Dezincification/[/URL] Takes a alkaline or acidic bath which could easily be cause by gun powder residue or break down with loaded rounds as well. It use to be seen sooner before manf properly annealed the necks. In general my guess would be say 10 yrs you can count on it being good in most any conditions after that at varying degrees you are getting hardening via the conversion and loss of zinc in the alloy. This also speaks of it directly in its effects on ammuntion and not just brass alloy in general. ASTM International publication STPA64 "Protective Resin Films In Cartridge Brass" based on studies at Frankford Arsenal. So want to give it a term I would say corrosion aging or cracking but corrosion something....... seems like the best name as age is not the given but actual environmental and powder breakdown. I bet if a cases that were thoroughly cleaned sized and annealed and put in air tight vaccum sealed bags and kept would not have these issues over long periods of time. [/QUOTE]
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Does Brass Dry Out???
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