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<p>[QUOTE=&quot;NSP, post: 3146273, member: 74849&quot;]What’s nice about copper and silver is that when they corrode, they form a passive film and further corrosion is significantly reduced. Iron corrosion is not self-limiting and does not form a passive film. </p><p><br /></p><p>I believe the difference is due to iron oxides being of great enough volume that it doesn’t strongly adhere to the uncorroded metal and the corrosion product flakes off. For silver and copper the atoms in the film are more compactly arranged and can more strongly adhere to the metal.[/QUOTE]</p><p><br /></p>

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