Corrosion testing - services

Intergranular corrosion tests on austenitic stainless steel

The test determines a material's susceptibility to intergranular (intercrystalline) corrosion. This is selective corrosion that occurs in or along the material's grain boundaries. As chromium carbide forms at the grain boundaries, the adjacent areas become depleted of chromium, causing the material to become more sensitive to corrosion in these depleted zones.

Standardised samples are removed and, if necessary, are heat treated (sentisised) before the material is boiled in a corrosion solution (copper sulphate solution, nitric acid, etc.) for a specific period of time, e.g. 15, 24 or 72 hours.

Pitting corrosion/general corrosion test for stainless steel

The corrosion resistance of the material is evaluated by determining the weight before and after the test. The depth, number and distribution of any corrosion pits are also measured and documented.

Standardised samples are removed and placed in a corrosion solution adapted for the test (different concentrations of ferric chloride solution) at a specific temperature, e.g. 22°C or 50°C, for a period of time between 24 and 72 hours.

Customer-specific tests

Customer-specific tests are performed, for example, when it is essential to ascertain the corrosion resistance of a material or product being manufactured. We also perform tests to ensure that materials meet specific standards according to a client's specific set of requirements.

When welding is carried out, testing is performed to ascertain the effects that the welding has on the material. It is of particular interest to analyse the heat-affected zone to make sure that the welding has not adversely affected the corrosion resistance of the material.

Damage investigations

We perform damage investigations to determine and examine corrosion damage, its cause, nature and extent.
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Contact

Catarina Wernlund
Phone: +46 (0)31-65 64 93
catarina.wernlund@safecontrol.se