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In metals, which region is more chemically reactive, the grain matrix or the grain boundary region? Why?

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Question added by Affan Waheed , Technical Sales Engineer , Carter Group
Date Posted: 2016/03/01
Bilal Hussain
by Bilal Hussain , Business Development Manager , Rust-Oleum Brands

Grain boundaries are more reactive because they have grater free energy as compared to Grains. And this is all because of the disordered arrangement of atoms at boundaries. 

Noureddine Saber
by Noureddine Saber , technician , moroccan air

grain boundary region because it's not protected chemically

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