The procedure for sample preparation was as follows: metal coupons of initial measurements 15 × 15 × 2 mm were ground using up to 1200-grit SiC abrasive paper, followed by subsequent polishing with suspensions containing 9, 3, and 1 µm diamonds to a mirror-like finish. The polished samples underwent a three-step cleaning procedure with deionised water, acetone, and ethanol using an ultrasonic bath at room temperature. Afterwards, the coupons were dried using an air gun, then dipped into the salt mixture in alumina crucibles.
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