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Strategies of metal corrosion protection

Authors
  • Pyun, Su-Il1
  • 1 Munji-Campus of Korea Advanced Institute of Science and Technology, #193 Munji-Ro, Yuseong-Gu, Daejon, 305-701, Republic of Korea , Daejon (South Korea)
Type
Published Article
Journal
ChemTexts
Publisher
Springer International Publishing
Publication Date
Nov 21, 2020
Volume
7
Issue
1
Identifiers
DOI: 10.1007/s40828-020-00121-y
Source
Springer Nature
Keywords
License
Yellow

Abstract

The present article involves the electrochemical fundamentals of overvoltage/polarization of charge transfer and preceding diffusion, short-circuited corrosion cells, the mixed potential theory underlying submicrocells, differential de-aeration cells, and finally introduction of two methods, namely potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS), of determining corrosion current density icorr\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$i_{{{\text{corr}}}}$$\end{document} and polarization resistance Rp\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$R_{{\text{p}}}$$\end{document} to make strategies to raise the cathodic hydrogen overvoltage/anodic overvoltage with two examples: a sacrificial anode and a green corrosion inhibitor. Carl Wagner’s pioneering creative work on the mixed potential theory is addressed with particular emphasis that even nowadays constitutes the principle (classical paradigm) of both the linear polarization and the Tafel extrapolation methods. From the critical assessment of corrosion inhibitors, some unexplained questions are extracted and proposed as formidable future challenges to address in the electrochemistry of corrosion inhibition.

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