Message:

<p>[QUOTE=&quot;Lehigh96, post: 2124099, member: 15309&quot;]The most common theory is that the minting process creates areas of localized strain hardening around the stars and lettering and that at some critical point, the number of dislocations created from plastic deformation in some way inhibits corrosion in conditions that will cause the remainder of the coin to form a thin film interface.&nbsp; Of course, this also requires that whatever corrosion resistance is caused by the strain hardening can be overcome by accelerating the toning process as is done in artificial toning methods.</p><p><br /></p><p>I have researched this topic in the past on the internet, but most of what I have found is contradictory to the theory.&nbsp; What I have found states that a higher dislocation density should increase diffusivity rates and actually increase the susceptibility to corrosion.&nbsp; However, even in those articles, I usually find a quote like this:</p><p><br /></p><p><br /></p><p><br /></p><p><a href="http://www.hindawi.com/journals/isrn/2013/921825/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.hindawi.com/journals/isrn/2013/921825/" rel="nofollow">An Investigation on Dislocation Density in Cold-Rolled Copper Using Electrochemical Impedance Spectroscopy</a></p><p><br /></p><p>And since Silver is not typically used in engineering applications, it is exceedingly difficult to find any research done on the formations of thin film interfaces on silver.&nbsp; I have often considered contacting my alma mater to suggest this topic for a graduate level thesis topic in the Materials Science department but I just never get around to doing it.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in