*2.2. Pitting Corrosion*

Steels #1–#17 (Table 1) were tested for pitting corrosion. The test samples, in the form of wires, 10 mm diameter, 5 cm long, were fixed in a resin and "mirror" polished.

The tests were carried out in the most commonly used electrolytes: FeCl3 and NaCl, and artificial sweat, according to ISO 3160-2:2015 [30]. The different electrolytes were used to verify the observations. The chemical compositions of the media used and the experimental conditions are presented in Table 3.

**Table 3.** Types of electrolytes used and the experimental conditions for testing pitting corrosion [31–33].


The immersion times were therefore different: 15 days for FeCl3 0.1 M, 26 days for NaCl 0.5 M and 30 days for artificial sweat (Table 3), because of the difference in aggressiveness of the media (chemical composition, concentration) towards the evaluated materials [34].
