Chemical Polarization Activation in Metal Deposition
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Questions and Answers

What is the equation for the equilibrium deposition potential?

  • $e_{eqm} = e_o - \ln \left(\frac{Z F}{C}\right)$
  • $e_{eqm} = e_o - \ln \left(\frac{C}{Z F}\right)$
  • $e_{eqm} = e_o + \ln \left(\frac{C}{Z F}\right)$ (correct)
  • $e_{eqm} = e_o + \ln \left(\frac{Z F}{C}\right)$

    • What is the extra voltage known as when the equilibrium deposition potential is not sufficient to start the reaction?

  • Electrochemical polarization
  • Activation or chemical polarization (correct)
  • Concentration polarization
  • Redox polarization

    • What factors affect activation polarization ($\eta_a$)?

  • Current density (correct)
  • Temperature
  • Electrode material
  • All of the above

    • What is the equation for activation polarization ($\eta_a$) in terms of current density ($i$)?

    <p>$\eta_a = a + b \log i$</p> Signup and view all the answers

    In which reactions does activation polarization (slow) appear more pronounced?

    <p>Electrodeposition and electro dissolution of metals such as Fe, Ni, Co, and discharge of gases such as H2, O2, and Cl2.</p> Signup and view all the answers

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