Problem 7.7: For each action identify whether it primarily
From Chapter 7 Problem Set. Level 2: Applied Thinking.
Question
For each action, identify whether it primarily targets the anode, cathode, or electron path: (a) oxygen scavenger in boiler feedwater, (b) nitrite in a closed loop, (c) calcium/alkalinity adjustment in a cooling tower, (d) dielectric union between dissimilar metals.
Answer
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(a) Cathode - removes the cathodic reactant (oxygen). (b) Anode - strengthens the passive film, locking the lattice. (c) Cathode - increases resistance via precipitating a protective film. (d) Electron path - breaks the metallic circuit between dissimilar metals.