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Intergranular Corrosion

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Intergranular Corrosion



Photo contributed by Ed Snible.
Intergranular Corrosion


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wgsant

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Registered: December 2003
Location: Missouri Ozarks
Posts: 85
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Date: February 3, 2004
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wgsant

Moderator
Intergranular Corrosion is a condition also referred to in coins as "Intercrystalline Corrosion" or "Crystallinity". The NASA website describes this corrosion as follows: "Intergranular corrosion is an attack on or adjacent to the grain boundaries of a metal or alloy. A highly magnified cross section of most commercial alloys will show its granular structure. This structure consists of quantities of individual grains, and each of these tiny grains has a clearly defined boundary that chemically differs from the metal within the grain center." The practical result is that the core of a coin may become brittle and filled with voids that diminish the structural integrity of the coin. Coins with intergranular corrosion are very susceptible to breaking under the slightest pressure. The condition is not always readily apparent from the surface condition of the coin, but is usually accompanied by a reduction of weight.
#1 February 3, 2004 11:49pm


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