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.
There are two basic methods of electrochemical measurement:
Matergenics has four Gamry systems To Meet your Electrochemical Testing Reqirments
Electrochemical corrosion tests include the following techniques:
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.
EIS technique is used to evaluate materials and coatings in corrosive environments. EIS measures impedance of the coating at different frequencies. This is an indication of barrier effect of the coating. Barrier coating will exhibit high impedance in corrosive exposures. Changes in electrical properties determined by EIS experiments have been found to closely resemble long-term performance of coatings.This way EIS method can detect deterioration at metal/coating interfaces well before defects become visible, and with greater accuracy than artificial testing methods such as salt spray.
Electrochemical Corrosion Cells
The above photos show various “Electrochemical Corrosion Cells” to test corrosion of bare or painted test coupons
Impedance Measurements on Organic Coatings on Mild Steel in Sodium Chloride Solutions Impedance Spectroscopy provides very useful information about protective coatings. The above plots clearly exhibits how good the coating is!
An Electrochemical Technique to Measure Diffusible Hydrogen in Metals Hydrogen Permeation Cell to Determine Hydrogen Diffusivity Through Metals
Electrochemical Techniques used for Corrosion Measurements:
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