Intergranular corrosion is a concern especially for alloys with high content of copper.
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Some austenitic stainless steels and nickel-based alloys are prone to intergranular corrosion.
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Certain alloys when exposed to a temperature characterized as a sensitizing temperature become particularly susceptible to intergranular corrosion.
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Referred to as dissimilar-metal corrosion, this process can occur as exfoliation or as intergranular corrosion.
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In a corrosive atmosphere, the grain interfaces of these sensitized alloys become very reactive and intergranular corrosion results.
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His research focus was on the mechanism of intergranular corrosion of aluminum-copper alloys and on the pitting of metals.
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Anisotropic alloys, where extrusion or heavy working leads to formation of long, flat grains, are especially prone to intergranular corrosion.
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Thus in certain aluminium alloys, small amounts of iron have been shown to segregate in the grain boundaries and cause intergranular corrosion.
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The ASTM A923, ASTM A262, and other similar tests are often used to determine when stainless steels are susceptible to intergranular corrosion.
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Another control technique for preventing intergranular corrosion involves incorporating strong carbide formers or stabilizing elements such as niobium or titanium in the stainless steels.
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