Electrochemical Potentiodynamic Reactivation (EPR)

Last updated: November 14, 2016

What Does Electrochemical Potentiodynamic Reactivation (EPR) Mean?

Electrochemical potentiodynamic reactivation (EPR) is a type of test created to evaluate susceptibility to intergranular or non-uniform corrosion. It is one of the most effective methods of testing related to alloys and stainless steels. An advantage of EPR is that it makes on-site, nondestructive examination possible.

EPR is a modern technique widely employed in various industries that can:

  • Identify alloy and stainless steel resistance to intergranular corrosion
  • Study precipitation and grain boundaries
  • Examine local changes to the structure and composition of alloys

Corrosionpedia Explains Electrochemical Potentiodynamic Reactivation (EPR)

EPR is a technique involving specimen polarization that is used for evaluating corrosion rates. It is a widely used method wherein the electrode potential varies on a particular rate through current application via the electrolyte. It utilizes potentiodynamic sweeps throughout potentials, such as from passive into active potential, also known as reactivation.

It is among the most efficient tests that measures corrosion resistance which can be applied in different functions, such as:

  • Evaluating susceptibility to pitting
  • Determining the changes in the potential current curve through scanning
  • Measuring the sensitization degree of alloys and stainless steels like grades S30403

Through this method, harmful stages in stainless steel are detected. However, this method requires a systematic study, especially when evaluating corrosion resistance in welded metal. The main goal here is to utilize experimental conditions that determine reductions or changes in terms of corrosion resistance brought about by deleterious phases in metals. With this test widely used, industries like mining, gas and oil, as well as many others, can count on highly reliable corrosion testing to prevent or fight corrosion in their facilities.


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