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Metallurgical Engineering Electrometallurgy And Corrosion Difficulty: Medium

'M'a't'c'h' 't'h'e' 'c'o'r'r'o's'i'o'n' 'p'h'e'n'o'm'e'n'o'n' 'w'i't'h' 't'h'e' 'm'a't'e'r'i'a'l' 'i'n' 'w'h'i'c'h' 't'h'e'y' 'a'r'e' 'c'o'm'm'o'n'l'y' 'o'b's'e'r'v'e'd'.' 'P'.' 'S'e'a's'o'n' 'c'r'a'c'k'i'n'g' '1'.' '7'0' ':' '3'0' 'b'r'a's's' 'Q'.' 'P'i't't'i'n'g' 'c'o'r'r'o's'i'o'n' '2'.' 'G'I' 'w'a't'e'r' 'l'i'n'e' 'f'i't't'e'd' 'w'i't'h' 'a' 'b'r'a's's' 't'a'p' 'R'.' 'G'a'l'v'a'n'i'c' 'c'o'r'r'o's'i'o'n' '3'.' 'D'u'r'a'l'u'm'i'n' 'S'.' 'C'a'u's't'i'c' 'e'm'b'r'i't't'l'e'r'n'e'n't' '4'.' 'B'o'i'l'e'r' 's't'e'e'l'

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