Electrochemical Testing

Electrochemical tests can directly amplify the impact of corrosion processes. This is because all electrochemical tests use some fundamental model of the electrode kinetics associated with corrosion processes to quantify corrosion rates. The amplification of the electrical signals generated during these tests permits very precise and sensitive measurements to be carried out.

Cyclic Polarization Measurements—Experimental Procedure and Evaluation of Test Data

There are two basic methods of electrochemical measurement:

• Applying external current to generate electrochemical data away from the free corrosion potential. These tests generally explore the relationship between electrochemical potential and current
• Electrochemical measurements at the free corrosion potential, without the application of an external current.

Matergenics has four  Gamry systems To Meet your Electrochemical Testing Reqirments

Electrochemical corrosion tests include the following techniques:

• Linear polarization resistance (LPR) measurements
• Potentiodynamic polarization curves
• Electrochemical potentiokinetic reactivation (EPR) measurements for intergranular corrosion
• Current vs time curves (at a given potential)
• Electrochemical impedance spectroscopy (EIS)
• Harmonic analysis
• Electrochemical noise (EN) measurements

Samples for electrochemical corrosion testing must utilize electrical conductors and must be small enough to fit in the polarization cell. Components can be tested as a whole or as a smaller section. Metal coupons are specially prepared for some tests.