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You must include how the pH solution can influence the corrosion rate, but remember that, if the pH is acid the solution had a high concentration of the H+ ions and, this condition can accelerate the reduction reaction. It is important to mention that the reduction reaction is a electrochemical reaction, for that reason, if you have a high concentration (pH acid) of H+ ions, obviously, you accelerate the electrochemical reaction. So that, How these ones can have a competitions if the electrochemical reaction rate depend of the pH?

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