THE EPR METHOD. AN NDT-METHOD FOR INTERGRANULAR CORROSION

An electrochemical potentiokinetic reactivation (EPR) method can be used instead of ordinary chemical methods for testing the susceptibility of stainless steels to intergranular corrosion. The EPR-testing can be performed on components and is therefore nondestructive. The portable test equipment consists of an electromechanical cell and a potentiostat equipment with a programmer unit and an X-Y-recorder. The EPR method utilizes an area of about 1 sq cm on the tested component. This area shall be polished and forms the anode around which the electrochemical cell is fitted. The sensitization of the stainless steel--that is the susceptability of the material to intergranular attack--is seen as an increase in the current density at the active region of the measured reactivation curve and as a preferential attack of the grain boundaries observed in a microscope. The degree of sensitization can be determined by using comparative test data for the same material measured by laboratory conditions.

  • Corporate Authors:

    International Scientific Association

    Rue du Commerce 20-22-Bte 7
    B-1040 Brussels,   Belgium 
  • Authors:
    • Purra, T
  • Publication Date: 1980

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Filing Info

  • Accession Number: 00323320
  • Record Type: Publication
  • Report/Paper Numbers: E 40
  • Files: TRIS
  • Created Date: Feb 6 1981 12:00AM