Pourbaix diagram and current voltage curve

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SUMMARY

The discussion centers on the application of Pourbaix diagrams to analyze the electrolytic nature of metals such as copper, aluminum, and magnesium in relation to iron corrosion. The user seeks to understand how to utilize Pourbaix diagrams to predict corrosion behavior and whether it is feasible to construct a current-voltage curve from experimental data. It is established that while Pourbaix diagrams provide thermodynamic stability information, they do not directly indicate corrosion rates, as passivation can occur even in corrosion-prone regions.

PREREQUISITES
  • Understanding of Pourbaix diagrams and their application in corrosion science.
  • Knowledge of redox processes involving metals.
  • Familiarity with electrochemical measurements and current-voltage curves.
  • Basic principles of passivation in corrosion contexts.
NEXT STEPS
  • Research the construction and interpretation of Pourbaix diagrams for specific metal pairs.
  • Learn how to derive current-voltage curves from electrochemical data.
  • Investigate the kinetics of corrosion and factors influencing corrosion rates.
  • Explore the mechanisms of passivation and its effects on corrosion resistance.
USEFUL FOR

Chemistry students, corrosion engineers, and researchers interested in electrochemistry and material degradation processes.

Naima DV
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TL;DR
How to use and compare a Pourbaix diagram and the current-voltage curve
I have a chemistry project and my research question roughly translates to:
What is the effect of the different metals electrolytic nature on iron corrosion?
(In french: Quel est l’effet de la nature électrolytique de différents métaux (cuivre, aluminium, magnésium) sur la corrosion humide du fer? )

To answer, I think I have to use a Pourbaix diagram relating the two metals implicated in the redox process to know if one of them is going to be subjected to corrosion. I am not sure if it's possible or how to use it.

During my experiment, I'm measuring the electric electric current between the two metals. Can I build a current-voltage curve from this data? If yes, how can I analyze it?Thank you to anyone who can answer!
 
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Pourbaix diagram refers to the stability (thermodynamics) but doesn't say anything about corrosion rate (kinetics).

Plus, some metals will not corrode (despite being in the corrosion region) because they get passivated by corrosion products.
 

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