Engineering, 25.11.2019 18:31 zalbesifki12

Equal 1 cm2 areas of metals p and q are immersed together in sulfuric acid of unit h+ activity having no other dissolved oxidizers.
using the electrochemical parameters listed below:

(a) determine corrosion potential and corrosion rate (current density) for each, when they are uncoupled.

(b) when p and q are electrically coupled, determine the potential and current passing in the galvanic couple so formed.

(c) determine the corrosion rates (current densities) for p and q when the two are galvanically coupled.

(d) which metal is cathodically protected (i. e. its corrosion rate decreases) upon galvanic coupling?

exchange current densities for hydrogen evolution on p is 1x105 and on q is 1x106 a/cm2

exchange current densities for metal dissolution on p is 10-6 and on q is 2x10-6 a/cm2.

reversible potentials for anodic dissolution for p is-.45 and for q is -0.60 v vs she.

assume all tafel constants are 0.1 v per decade.

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Equal 1 cm2 areas of metals p and q are immersed together in sulfuric acid of unit h+ activity havin...

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