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Electrochemical & Corrosion Testing

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Overview


Exponent’s laboratory facilities related to corrosion testing and evaluation include electrochemical cells, potentiostats, metallographic equipment, optical and scanning electron microscopes, and tensile test equipment. These capabilities are used to help our clients solve a variety of problems associated with materials selection, degradation mechanisms, and failure analysis in a range of industries, including construction, biomedical, manufacturing, utilities, chemical and petrochemical, and electronics. 

Our corrosion testing and evaluation equipment includes:

Electrochemical Test Equipment

  • Standalone and computer-based potentiostats and galvanostats 
  • Electrochemical test cells 
    • General purpose test cells 
    • Dedicated cells for medical and biomedical testing 
    • Paint test cells 
  • Temperature-control equipment 
  • Variety of reference electrodes (e.g., SCE, Ag/AgCl), ion-selective electrodes, and pH meters

Electrochemical Techniques 

  • Corrosion potential measurement & monitoring 
  • Cyclic potentiodynamic polarization tests for medical devices (ASTM F2129)
  • Polarization resistance 
  • Electrochemical impedance spectroscopy (EIS) 
  • Galvanic current measurement & monitoring 
  • Linear sweep and cyclic voltammetry

Applications 

  • Corrosion rate and mechanism determinations 
  • Susceptibility to pitting and crevice corrosion 
  • Susceptibility to stress corrosion cracking 
  • Coating performance

Microscopy and Materials Characterization

  • Metallographic facilities for sectioning, mounting, polishing, and etching materials 
  • Optical metallographs 
    • Examination of specimen microstructure 
  • Stereo microscopes 
    • Low magnification surface imaging (e.g., up to 100x) 
  • Optical microscopes 
    • Medium magnification surface imaging (e.g., up to 1000x) 
  • Scanning electron microscopes (SEM) 
    • High magnification surface imaging (e.g., up to 5000x) 
  • Energy dispersive spectroscopy (EDS) 
    • Elemental analysis of materials and corrosion products

Mechanical and Environmental Test Facilities

  • Computer-controlled load frames for determining the mechanical properties of metal composites, polymers, or advance materials in air or in a corrosive environment. This equipment can be used to determine the susceptibilility of a material to environmentally assisted cracking such as stress-corrosion cracking (SCC), hydrogen-assisted cracking or embrittlement (HAC or HE), or corrosion-fatigue 
  • Cyclic oxidation and gravimetric equipment are available for high temperature oxidation and weight loss or gain evaluations 
  • Cyclic temperature and humidity equipment and furnaces are available for highly accelerated environmental testing