Intergranular+corrosion

=Intergranular Corrosion in Breweries =

Background
This type of corrosion is very relevant for the brewery industry. It consists of a localized attack, where a narrow path is corroded out preferentially along grain boundaries of a metal [1]. This type of corrosion may have extreme effects on mechanical properties, resulting in a loss of strength and ductility [2].

Mechanism
The push-factor behind this rapid attack is the difference in corrosion potential between the grain boundary and the bulk material in adjacent grains; it proceeds at the surface via local cell action. A grain boundary material of limited area acts as the anode while large areas of grain act as the cathode [2].

The following images show examples of intergranular corrosion:







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Reference
 [1] P. Roberge, //Corrosion Engineering: Principles and practice. // USA: McHGraw-Hill Companies, Inc, 2008.

[2] H.H. Uhlig and R.W. Revie, //Corrosion and corrosion control, // 3rd ed. USA: John Wiley and Sons, 1985, pp.1-2.

[3] C//dcorrosion.com,// [Online]. Available: []. [Accessed Nov. 28, 2009].

[4] C//orrosionsource.com,// [Online]. Available: []. [Accessed Nov. 28, 2009].

[5] //Materialsengineer.com,// [Online]. Available: []. [Accessed Nov. 28, 2009].