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Asked: 2020-03-14T04:06:00+05:30 In:

GATE MT 2011 Q14. Zinc rod is immersed in dilute HCl(pure). If a very small amount of FeCl3 is added to the solution, the corrosion rate of Zinc:

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13.33%(A) decreases ( 2 voters )
73.33%(B) increases ( 11 voters )
0%(C) remains constant
13.33%(D) is zero (passivation) ( 2 voters )
Based On 15 Votes

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GATE MT 2011 Q14. Zinc rod is immersed in dilute HCl(pure). If a very small amount of FeCl3 is added to the solution, the corrosion rate of Zinc:
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    2 Answers

    1. Platinum GATE Metallurgy Coaching |Providing Video Solutions and Concepts of Metallurgy since 2016 | Follow our channel, "C Patel Metallurgy" on Youtube for your GATE preparation

      Corrosion rate shall increase. More Zinc will be needed to balance extra equation Fe3+ + electron = Fe2+

      Corrosion rate shall increase.

      More Zinc will be needed to balance extra equation

      Fe3+ + electron = Fe2+

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    2. Best Answer
      official account of Askmemetallurgy

      Correct answer is option B. Fe+3  ions increases the rate of reduction overall. Hence to balance ired , ioxi has to be increased. Hence. oxidation/corrosion of Zn will increase.

      Correct answer is option B.

      • Fe+3  ions increases the rate of reduction overall. Hence to balance ired , ioxi has to be increased. Hence. oxidation/corrosion of Zn will increase.
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