Corrosion Testing

During the last few decades, many corrosion resistant metals were introduced, each having its own application. The corrosion resistance of these metals not only depends on their chemical composition, but also on the microstructure and the environment. Several kinds of corrosion tests were developed to predict the performance of the material in certain kinds of environments and against certain forms of corrosion (for example general corrosion, intergranular corrosion, pitting or stress corrosion).   

General corrosion is a form of corrosion that proceeds uniformly over the entire surface.   

Intergranular corrosion (IGC) is a form of corrosion in which the material is attacked along the grain boundaries. This type of corrosion is a well-known phenomenon for austenitic stainless steels and is caused by precipitation of chromium carbides at the boundaries.

Pitting corrosion is a localised form of corrosion that causes cavities or small holes in the material. It is considered a dangerous form of corrosion because the small holes are often difficult the detect and can penetrate through the material very quickly.  

Stress corrosion is a form of corrosion cracking that can occur as a result of the combined influence of tensile stress and a corrosive environment. It is also considered dangerous because the speed of crack initiation and propagation can be very high (even after a few hours of exposure).  

Our laboratory carries out a number of corrosion tests to determine the susceptibility of a material to these types of corrosion. Most of these tests comprise treatment with chemicals, sometimes combined with mechanical testing followed by examination under a microscope. Scroll down for an overview of the different corrosion tests we offer.

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Our corrosion tests:

  • Testing susceptibility of stainless steel to pitting corrosion according to ASTM G48 method A
  • Testing susceptibility of stainless steel to crevice corrosion according to ASTM G48 method B
  • Testing of detrimental intermetallic phases in duplex (austenitic / ferritic) stainless steel according to ASTM A923 method C
  • Testing of susceptibility to intergranular corrosion in austenitic stainless steel according to ASTM A262 practice B (Streicher), C (Huey test) or E (Strauss test)
  • Determination of resistance to intergranular corrosion of stainless steel according to ISO 3651-1 (Huey test) or ISO 3651-2 (Strauss test)
  • Detecting susceptibility to intergranular corrosion in wrought, Nickel-rich, Chromium-bearing alloys according to ASTM G28 Method A
  • Testing corrosion resistance of coatings and base materials using salt water spray according to ISO 9227 or ASTM B117

Henk Schroots

Area Sales Manager NDT & Laboratory

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