Corrosion testing provides critical insights throughout a product lifecycle, from materials selection early in the design process to quality control and failure analysis. EAG Laboratories is equipped to evaluate the composition, microstructure, surface features and corrosion performance. Specific sample preparation and advanced microscopy techniques allow detailed observation of the microstructural components. Utilizing potentiodynamic polarization, a systematic measurement between the environment and metal interface, allows comparison of electroactive features like the passivation region of corrosion resistant alloys. Corrosion potential, corrosion rate and pitting susceptibility are also measurable.
Corrosion testing is particularly important in medical device systems since uncontrolled release of metallic ions can have damaging biological effects. The standard approach of ASTM F2129 applies cyclic potentiodynamic polarization to small medical implant devices (vascular stents, ureteral stents, filters, endovascular grafts, cardiac occluders, etc.) in the final form and finish. Testing the final form and finish is a key issue since the processes involved in shaping and finishing a metal surface can alter the passivation layer, changing the results from the raw material from passive to active in a biological environment.
In addition to the standard approaches in ASTM F2129, EAG Laboratories can evaluate corrosion in customized solutions to mimic environments relevant to your application. This includes artificial physiological environments like sweat or stomach acid. We can manipulate solution concentration, salt composition and temperature to assess situations of particular concern.
These corrosion evaluations can also be used to assist in failure analysis investigations of components that have failed due to unexpected corrosion mechanisms. These corrosion tests can be modified to accommodate various sample configurations, chemical solutions, test temperatures and applied corrosion voltages. Unusual or unexpected service environments can then be recreated.
Testing per ASTM F2129
This cyclic potentiodynamic polarization plot was obtained by using Phosphate Buffered Saline (PBS) at 25ºC. The system was purged with nitrogen for 30 minutes.
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