2. Materials and Methods
Samples were grinded with standard metallographic
preparation procedures using Buehler abrasive belt
grinder. Tap water was used to clean the debris from samples
during abrasive polishing. Each sample was cleaned with
deionized water prior to polishing and then ultrasonically
cleaned with acetone for 15 min. EP and MEP treatments were
performed by Electrobright (Macungie, PA, USA).