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Why 5052 turn black after annealing during the production of aluminum alloy - Printable Version

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Why 5052 turn black after annealing during the production of aluminum alloy - florineet2 - 01-14-2020

Why 5052 turn black after annealing during the production of aluminum alloy?The aluminum oxide in the surface has been oxidized by other chemical elements.It has been sooted.Other related question