Coupons were weighed before immersing in the medium for six months at 37°C. At the end of the experiment, the coupons were taken out, washed three times with 100 ml high pure water, then cleaned in an ultrasonic bath for 2 min. The samples were then immersed in Clarke's solution according to ASTM standard G1-03 [49]. Finally, all samples were rinsed in high pure water followed by 80% ethanol and dried in a biohazard cabinet. The cleaned samples were weighed and the surface analysed by SEM-EDX JEOL JXA-8200 EPMA WDS/EDS.

The corrosion rate (millimetre per year (mmpy)) of the coupons was measured according to ASTM standard G1-03 using weight loss measurements [49]:

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