Contact person
Rikard Norling
Enhetschef
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High temperature corrosion
Additive manufactured material’s (AM) oxidation properties are evaluated at different temperatures (>300°C) by means of oxide thickness measurements and mass gain or loss determinations after laboratory exposures. The exposure can by carried out in air or reactive gas depending on the application.
Purpose
Oxidation tests give information on how fast, how thick and how stable an oxide layer forms on a metallic alloy at high temperature. High oxidation rate means that the metal will quickly be consumed and transformed into a metal oxide (corrosion product). This can have a direct impact on the mechanical and structural properties of components. The oxidation rate of AM materials can differ from conventional manufactured material because of AM materials’ complex microstructure and therefore need to be investigated separately. Laboratory exposures we offer quantifies the oxidation resistance of your material in an environment which usually resembles the application.
Method
Sample coupons are placed in a tube furnace which is heated up to desired temperature. Synthetic air or any other active gas is flowed through the tube. Samples are weighed before and after exposure to determine the mass change and the thickness is measured to evaluate changes in thickness caused by oxidation.
It is also possible to deposit salts or other expected corrosive deposits from the targeted application to determine their impact. Thermal cycling can be added and compared with isothermal tests to investigate the effect of varying temperature.
Oxides or corrosion products can then be further analysed with microscopy or chemical characterisation methods to gain better understanding of the corrosion mechanism.
Deliveries
A report with summarised data in graphs and results from calculated oxidation rate.
