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<p>[QUOTE=&quot;rlm&#039;s cents, post: 447626, member: 7957&quot;]I will add to hypothesis.&nbsp; I do not know this as a fact, but I am will to bet I am right.&nbsp; Any acid etching I am aware of does not occur uniformly.&nbsp; It pits the surface.&nbsp; I will grant you that dipping effects would have to be seen with an electron microscope, but I would guess that the pitting is still there.&nbsp; The pitting does 2 things to increase the corrosion.&nbsp; It increases the surface area.&nbsp; I bet you would be surprised how much extra surface area there would be mocroscopically that is.&nbsp; Secondly, those pits tend to hold the bad stuffs and corrode quicker in the bottom of the pits.[/QUOTE]</p><p><br /></p>

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