Corrosion Testing

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Corrosion Testing Laboratories (CTL) was founded as a laboratory to provided corrosion testing services for industrial and commercial product facilities that required it over 30 years ago. Overtime our capabilities have expanded into a wide range of tests related to evaluating the corrosion resistance and corrosivity of different materials.

Testing is performed by the laboratory staff, which is comprised of members that are individually certified by the National Association for Corrosion Engineers (NACE).  Certifications held include Corrosion Technicians, Senior Materials Analysts, and Design Specialists. CTL has experience testing to methods published by standard development organizations, such as ASTM, NACE, ISO, and MTI , but we excel at adapting accepted test methods to specific or unique applications to assist our clients in the material selection process.  A representative list of standards we frequently test to is shown on the right.

Our corrosion testing services divide into three fundamental categories: (1) Material Acceptance Tests, (2) Material Selection Testing, and (3) Regulatory Testing.  Additional information about each category is provided below.

Material Acceptance Testing

Material acceptance tests is a category of testing that includes methods used to certify material after fabrication has been completed (e.g., rolled metal plates, formed brass valves).  These standardized tests aim to ensure material quality and validate that fabrication process has not compromised the corrosion resistance of the material. Methods that fall into this category include, but are not limited to, the following test methods:

  • Stainless Steels and Nickel Alloys: ASTM A 262, G 28, G 48, A 923, A1084, G108, and DuPont SW800M
  • Aluminum Alloys: ASTM G66 and ASTM G67
  • Materials for Sour Service: NACE TM0284 and NACE TM0177

Material Design Selection

Corrosion testing is a critical part of the material selection during the design phase of process equipment and commercial product applications.  These tests simulate expected exposure conditions and atmospheres in the hopes of mimicking potential corrosion activity.  Corrosion resistance can be evaluated through methods such as comparative visual examination before/after exposure, weight loss measurement, pit depth measurement, and corrosion rate calculations.   Standard and custom laboratory tests both provide the ability to general critical data for making these decisions. Common test methods employed in the materials selection process include:

  •  ASTM G31/NACE TM0169 – Single and multi-phase corrosion tests
  • Non-Metallics – ASTM D543
  • High Pressure and High Temperature – ASTM G111
  • Coating Performance Testing
  • Localized Corrosion Resistance
  • Electrochemical Corrosion Testing
  • Testing for Specific Modes of Corrosion (e.g., Stress Cracking)
  • Customized Test Methods to Simulate Specific Environments.

Regulatory Testing (DOT, EPA, GHA)

Regulatory agencies, such as the DOT, EPA, and GHS, require proper characterization of chemicals for labeling and shipping purposes.  This allows for appropriate and safe storage and handling of the chemicals.  CTL performs a variety of these characterization tests, including:

  • Skin Corrosivity – InVitro Corrositex
  • Metal Corrosivity – UN Model Regulation Section 37
  • Waste Product Corrosivity – EPA SW-846, Method 1110


Coupons prepared for testing.

  • TM 0169:  Laboratory Corrosion Testing of Metals
  • TM 0174:  Laboratory Methods for the Evaluation of Protective Coatings and Lining Materials in Immersion Service
  • TM 0177: Laboratory Testing of Metals for Resistance to Sulfide Stress Cracking in H2S Environments
  • TM 0284: Evaluation of Pipeline Steels for Resistance to Stepwise Cracking
  • TM 0187: Evaluating Elastomeric Materials in Sour Gas Environments
  • TM 0190: Impressed Current Test Method for Laboratory Testing of Aluminum Anodes
  • TM 0193: Laboratory Corrosion Testing of Metals in Static Chemical Cleaning Solutions at Temperatures below 93C (200F)
  • A90/A90M: Weight of Zinc Coatings
  • A262: Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels.
  • A 763: Practices for Detecting Susceptibility to Intergranular Attack in Ferritic Stainless Steels.
  • B 813: Liquid and Paste Fluxes for Soldering Applications of Copper and Copper Alloy Tube
  • F 746: Test Method for Pitting or Crevice Corrosion of Metallic Surgical Implant Materials
  • F 2129: Conducting cyclic potentiodynamic polarization measurements to determine the corrosion susceptibility of small implant devices
  • G 5: Standard Reference Test Method for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements
  • G 28: Method for Detecting Susceptibility to Intergranular Attack in Wrought Nickel-Rich, Chromium-Bearing Alloys
  • G 31: Practice for Laboratory Immersion Corrosion Testing of Metals
  • G 34: Test Method for Exfoliation Corrosion Susceptibility in 2XXX and 7XXX Series Aluminum Alloys (EXCO Test)
  • G 35: Practice for Determining the Susceptibility of Stainless Steels and Related Nickel-Chromium-Iron Alloys to Stress Corrosion Cracking in Polythionic Acids
  • G 36: Practice for Performing Stress-Corrosion Cracking Tests in a Boiling Magnesium Chloride Solution
  • G 37: Practice for Use of Mattson’s Solution of pH 7.2 to Evaluate the Stress-Corrosion Cracking Susceptibility of Copper-Zinc Alloys
  • G 41: Practice for Determining Cracking Susceptibility of Metals Exposed Under Stress to a Hot Salt Environment
  • G 44: Practice for Alternate Immersion Stress Corrosion Testing in 3.5% Sodium Chloride Solution
  • G 47: Test Method for Determining Susceptibility to Stress-Corrosion Cracking of High-Strength Aluminum Alloy Products
  • G 48: Test Method for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by the Use of Ferric Chloride Solution
  • G 54: Practice for Simple Static Oxidation Testing
  • G 59: Practice for Conducting Potentiodynamic Polarization Resistance Measurements
  • G 61: Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements for Localized Corrosion Susceptibility of Iron-, Nickel-. or Cobalt-Based Alloys
  • G 66: Test Method for Visual Assessment of Exfoliation Corrosion Susceptibility of 5XXX Series Aluminum Alloys (ASSET Test)
  • G 67: Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)
  • G 69: Practice for Measurement of Corrosion Potentials of Aluminum Alloys
  • G 71: Practice for Conducting and Evaluating Galvanic Corrosion Test in Electrolytes
  • G 75: Test Method for Slurry Abrasivity by Miller Number and Slurry Abrasion Response of Materials (SAR Number)
  • G 78: Guide for Crevice Corrosion Testing of Iron Base and Nickel Base Stainless Alloys in Sea water and Other Chloride-Containing Aqueous Environments
  • G 79: Practice for Evaluation of Metals Exposed to Carburization Environments
  • G 97: Test Method for Laboratory Evaluation of Magnesium Sacrificial Anode Test Specimens for Underground Applications
  • G 103: Method for Performing a Stress-Corrosion Cracking Test of Low Copper Containing Al-Zn-Mg Alloys in Boiling 6% Sodium Chloride Solution
  • G 108: Test Method for Electrochemical Reactivation (EPEE) for Detecting Sensitization of AXIS Type 304 and 304L Stainless Steels
  • G 110: Practice for Evaluating Intergranular Corrosion Resistance of Heat-Treatable Aluminum Alloys by Immersion in Sodium Chloride + Hydrogen Peroxide Solution
  • G 123: Test Method for Evaluating Stress-Corrosion Cracking of Stainless Alloys with Different Nickel Content in Boiling Acidified Sodium Chloride Solution
  • G 150: Test Method for Electrochemical Critical Pitting Temperature Testing of Stainless Steels
  • ISO 3651: Austenitic Stainless Steel Determination of Resistance to Intergranular Corrosion – Part I: Corrosion Test in Nitric Acid Medium by Measurement of Loss in Mass (Huey Test)
  • ISO 6509: Corrosion of Metals and Alloys Determination of Dezincation Resistance of Brass
  • ISO 7539-2: Corrosion of Metals and Alloys Stress Corrosion Testing – Part 2: Preparation and Use of Bent Beam Specimens
  • ISO 7539-3: Corrosion of Metals and Alloys  Stress Corrosion Testing – Part 3: Preparation and Use of U-Bend Specimens
  • ISO 7539-5: Corrosion of Metals and Alloys  Stress Corrosion Testing – Part 5: Preparation and Use of C-Ring Specimens
  • ISO 9400: Nickel-Based Alloys Determination of Resistance to Intergranular Corrosion
  • ISO 9591: Corrosion of Aluminum Alloys Determination of Resistance to Stress Corrosion Cracking
  • MTI 1: Method for Laboratory Testing of Wrought Iron-and Nickel-Base Alloys for Relative Resistance to Corrosion in Selected Media
  • MTI 2: Method for Laboratory Testing of Wrought Iron-and Nickel-Base Alloys for Relative Resistance to Crevice Corrosion in a Standard Ferric Chloride Solution
  • MTI 3: Method for Laboratory Testing of Wrought Iron-and Nickel-Base Alloys for Relative Resistance to Stress-Corrosion Cracking in a Boiling Magnesium Chloride Solution
  • MTI 4: Method for Laboratory Testing of Wrought Iron-and Nickel-Base Alloys for Relative Resistance to Crevice Corrosion in Sodium Chloride Solutions

link to case studies

More bite sized corrosion examples