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Unformatted text preview: for the two materials. For such conditions, which of the two metals is cathodically protected? Which of the two is galvanically corroded? Is it possible for two coupled metals to both be galvanically corroded? [b] Is it possible for the corrosion potential of two coupled metals to lie between the corrosion potentials for the two uncoupled metals? How or why not? 67. Plot the polarization curves and determine the galvanic corrosion rate [a] when 1cm 2 of metal C is coupled to 1cm 2 of metal A in a corrosive solution.; [b] when 10cm 2 of C is coupled to 1cm 2 of A in the same solution; [c] when a solution resistance of 3000 ohms is present between A and C in [b]. 0.1 105 2x1060.6 Q 0.1 106 3x1070.5 P b i o (C,H) i o (A) E eq material 106 0.1 0.04 C 107 0.1 0.05 A I corr , A b C , volts b A , volts material E corr (C)  E corr (A) = 0.500 v, with C noble to A...
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 Fall '09
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