Flatcella

R.A. Bauer & Associates LLC

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We maintain four research grade potentiostats and a selection of commercial and custom built cells to measure
corrosion rates on standard coupons and almost any shape part.

Electrochemical Corrosion Testing

ASTM G59 – Standard Test Method for Conducting Potentiodynamic Polarization Resistance Measurements.

This method can very accurately determine the corrosion rate. Thoughtful choices of temperature, corrodant, and proper conditioning of the test sample will give results that correspond with real world
behavior and can be used to predict long term corrosion.

Conducting Potentiodynamic Polarization Resistance Measurements
 

ASTM G61 – Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements for Localized Corrosion Susceptibility of Iron-, Nickel-, or Cobalt-based Alloys

Variations to this method can give a long term corrosion rate, and semiquantitatively define susceptibility to pitting, passive surfaces, and repassivization after damage to the coated surface

Conducting Cyclic Potentiodynamic Polarization Measurements
 
ASTM G106 – Standard Practice for Verification of Algorithm and Equipment for Electrochemical Impedance Measurements Although there are no standard methods, EIS is a useful tool to quantify porosity in coatings, detect degradation of a coating due to water absorption or chemical changes, and detect the onset of corrosion under the coating. Depending on the composition of the coating, these results can also be used to predict failure of the coating years into the future. Equipment for Electrochemical Impedance Measurements
 
ASTM G102 – Standard Practice for Calculation of Corrosion Rates and Related Information from Electrochemical Measurements Corrosion Rates
 

Electrochemical Noise

Although there are no standard methods, ECN is a powerful tool to
detect the earliest onset of localized corrosion.

Electrochemical Noise
 
ASTM G71 – Standard Guide for Conducting and Evaluating Galvanic Corrosion Tests in Electrolytes Conducting and Evaluating Galvanic Corrosion Tests
 
ASTM G31 – Standard Practice for Laboratory Immersion Testing of Metals Laboratory Immersion Testing of Metals
 

ASTM G185 – Standard Practice for Evaluating and Qualifying Oil field and Refinery Corrosion Inhibitors Using the Rotating Cylinder Electrode

A rotating cylinder electrode apparatus can be combined with any of the above tests.

A Rotating Cylinder Electrode Apparatus

Failure Analysis and Consulting

Our involvement in failure studies is usually when the problem involves all – the materials, the processing, and contaminants resulting in corrosion. We are very good at organizing complex cause maps and recognizing when ordinarily benign materials can interact with other normally benign materials. 

Our approach to failure analysis is to thoughtfully choose a few very likely failure scenarios and try to prove or disprove these. Looking at all of the possibilities from the beginning is confusing, time consuming, too expensive, and often has misleading conclusions. Rarely will there be need to go beyond the first, experience based, choices to investigate. 

The best outcomes are when there is corroborating evidence, that is completely independent of the testing done, and supports the test conclusions.

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