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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? 6-7. Plot the polarization curves and determine the galvanic corrosion rate [a] when 1-cm 2 of metal C is coupled to 1-cm 2 of metal A in a corrosive solution.; [b] when 10-cm 2 of C is coupled to 1-cm 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 10-5 2x10-6-0.6 Q 0.1 10-6 3x10-7-0.5 P b i o (C,H) i o (A) E eq material 10-6 0.1 0.04 C 10-7 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