What is Corrosion resistance?

Corrosion resistance is the property of a metal, or in general a material, to resist to corrosion attack in a particular environment at defined operating conditions, pressure, temperature and fluid velocity.

Usually the resistance to corrosion is expressed in terms of Corrosion rate, mm/y or mils.

Tables with corrosion rate for different fluids and operating conditions are available to estimate the corrosion resistance of a material.

The resistance to corrosion of a metal can be increased by means of corrosion control methods like cathodic protection, coating and painting or corrosion inhibitor.

Types of Corrosion of metals

Although there is only one fundamental mechanism of corrosion, the electrochemical cell, there are several Corrosion forms or Types of Corrosion that can occur.

Each form of type or corrosion of metals has a specific arrangement of anodes and cathodes and the corrosion which occurs has a specific location and pattern.

Each form of corrosion can be effectively controlled during design if it is anticipated and by selecting the correct corrosion control methos.

By understanding the various types of corrosion, the conditions under which they occur, and how they are quantified, the type of corrosion prevention of metals can be selected.

The most important metal corrosion types are:

  • Uniform Corrosion                                              
  • Concentration Cell Corrosion.
  • Intergranular Corrosion
  • Atmospheric Corrosion
  • Erosion Corrosion
  • Fretting Corrosion
  • Dealloiyng

  • Formicary Corrosion
  • Microbiological Corrosion – MIC
  • Galvanic Corrosion or Bimetallic Corrosion – Galvanic Corrosion Documents
  • Pitting Corrosion – Crevice Corrosion
  • Stress Corrosion Cracking
  • Cavitation Corrosion
  • Hydrogen Embrittlement
  • Immunity
  • Corrosion Fatigue