Dry corrosion of metals - Mechanisms | Techniques de l'Ingénieur

Overview

Read this article from a comprehensive knowledge base, updated and supplemented with articles reviewed by scientific committees.

Read the article

AUTHORS

Laurent ANTONI : Doctorate in engineering from the Institut national polytechnique de Grenoble, - Grenoble National School of Electrochemistry and Electrometallurgy
Alain GALERIE : Professor at the Institut national polytechnique de Grenoble, - Grenoble National School of Electrochemistry and Electrometallurgy

INTRODUCTION

Thermodynamics enables us to determine the nature of the phases present at equilibrium when we fix the temperature and partial pressure of the various gaseous species interacting with a metal or alloy.

It is therefore an indispensable tool for a scientific approach to dry corrosion. However, we must not lose sight of the fact that all corrosion is, in essence, a situation of global non-equilibrium, and that only local equilibrium situations can be correctly described.

To clarify morphological observations and mechanisms, we have chosen oxidation as an example of a dry corrosion reaction. The transposition to sulfidation (layer growth), carburizing or nitriding (internal precipitation) and chlorination (evaporation) is immediate.

Note :

This theoretical study on the dry corrosion of metals consists of two parts:

- Dry corrosion of metals. Study methods ;
[M 4 221] - Dry corrosion of metals. Mechanisms; to which is attached a documentation booklet "Pour en savoir plus" ;
- Dry corrosion of metals. Study methods and mechanisms.

The practical study of various industrial cases is covered in :