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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.

 

image002_largeCyclic 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.

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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: 

Scanning Reference Electrode Techniques in Localized Corrosion

Potential Dependence of Localized Corrosion in Iron

A Method for Quantifying the Initiation and Propagation Stages of Crevice Corrosion

A Strain-Control Technique for Assessing the Corrosion-Fatigue Sensitivity of Stainless Steels

Potential and Strain-Rate Effects in Slow Strain-Rate Stress Corrosion Cracking of Type 304 Stainless Steel in 35 Percent Magnesium Chloride at 120°C

Corrosion and Electrochemical Behavior of Iron-Chromium-Nickel Alloys in Concentrated Sulfuric Acid Solutions

Electrochemical Impedance Techniques in Corrosion Science

Alternating-Current Impedance Measurements Applied to Corrosion Studies and Corrosion-Rate Determination

A Corrosion Monitor Based on Impedance Method

Impedance Measurements on Organic Coatings on Mild Steel in Sodium Chloride Solutions

Digital Faradaic Impedance Measurements on Corroding Copper in Acid Solutions

Evaluation of Electrochemical Techniques for Monitoring of Atmospheric Corrosion Phenomena

Practical Experience with an Electrochemical Technique for Atmospheric Corrosion Monitoring

An Electrochemical Technique to Measure Diffusible Hydrogen in Metals (Barnacle Electrode)

Cyclic Polarization Measurements—Experimental Procedure and Evaluation of Test Data

Application of Potentiokinetic Hysteresis Technique to Characterize the Chloride Corrosion of High-Copper Dental Amalgams

Direct Measurement of the Corrosion Current for Oxygen-Reduction Corrosion

Electrochemical Behavior of Carbon Steel in Fused Salts

Galvanic Corrosion of Copper Alloys

Electrochemical Investigation of Cavitation-Corrosion Damages of a Pump Casing

A Method of Evaluating Polarization Curves for Stainless Steel via a Simple Passivation Model

Effect of Large Voltage Modulations on Electrodes Under Charge-Transfer Control

Progress in Mini-Potentiostat Development for Corrosion Testing

A Microprocessor-Based Corrosion Measurement System

We are here to help

We respond to all customers promptly by sending a technical proposal to address testing, investigation and the proposal costs. If we need more information, our engineers will contact you.

Whether you are a large corporation or a small enterprise, we will provide you with the attention you need and deserve. In so doing, we hope to work with you for many years to come.

Please call Dr. Zee at 412-952-9441 or 412-952-9441 and let us know how we can assist you in your investigation. Alternatively, you can send your request to info@matergenics.com.

Looking forward to hearing from you!

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