Pitting and Crevice Corrosion Testing

Pitting corrosion is the phenomenon that in some environmental media, the surface of metal materials does not corrode or corrodes very slightly, but corrosion holes appear in the small areas of the surface and as time goes by, they develop in the depth direction and forming small hole-like corrosion pits. Pitting corrosion can accelerate other types of local corrosion, like intercrystalline corrosion, stress corrosion cracking, corrosion fatigue, etc.

Crevice corrosion is a kind of local corrosion which often occurs in the narrow gap between metal and metal or non-metal in the presence of electrolyte solution, such as holes, gasket contact surface, lap joint, sediment, fastener crevice, etc. The crevice corrosion will decrease the strength of the parts, and weaken the matching degree. The increase of the corrosion volume in the crevice will cause local additional stress, which not only makes assembly difficult, but also reduces the bearing capacity of components.

STEMart carries out professional pitting and crevice corrosion testing to provide necessary data to help you select the right materials combinations for your required application.

Test Capabilities

• Measurement of size, shape and density of pitting corrosion pits
• Measurement of pitting corrosion degree
• Evaluation of pitting corrosion: Rate pit according to density, size and depth of pits
• Critical crevice temperature testing
• Galvanic series determination
• Preferential weld corrosion
• Polarization curve analysis
• Sensitivity assessment

STEMart's expert team can advise on which test is best for your specific requirements depending on the project goal. For more information about our pitting and crevice corrosion testing services, please contact us.