42. Решение задачки по химии №9

7. Consider this metal in contact with another in two cases: a) impurity of another metal; b) coating. For case (a) - impurity: indicate the conditions when corrosion is weakened and when it is strengthened. The same for coatings (cathodic and anodic coatings). Calculate the potential difference under current during corrosion, write the equations of the reactions of corrosion destruction, draw a conclusion about the effectiveness of protection or its absence.
Metal Impurity or coating Depolarization Environment
Zn Cr Hydrogen pH7

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