Fig. 2 | npj Materials Degradation

Fig. 2

From: Using macro and micro electrochemical methods to understand the corrosion behavior of stainless steel thermal spray coatings

Fig. 2

a PDP measurements of a SS 444 HVOF coating recorded at increasing immersion times from 1 h (red), 5 h (wine), 10 h (black), 24 h (blue), and 100 h (green) show a drop in corrosion potential (black arrow) and evolution of passivity region over time. This shift in corrosion behavior can be attributed to the chemical change over time from being Fe rich to Cr rich as seen from the PDP measurements in pure metallic Fe and Cr in b. The SEM images of the coatings before (c) and after (d) immersion tests show the loss of material and shell-like morphology of the corroded coatings

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