Electrochemical characteristics and damage mechanism in scrubber washing water of UNS N08367 with plasma ion nitriding and electropolishing

• Published in: Npj Materials degradation 2024-06, Vol.8 (1), p.60-13
• Main Authors: Hwang, Hyun-Kyu, Kim, Seong-Jong
• Format: Article
• Language: English
• Subjects: 639/166/898; 639/638/542; Austenitic stainless steels; Chemistry and Materials Science; Corrosion; Corrosion and Coatings; Corrosion currents; Corrosion resistance; Damage; Electrochemistry; Electrode polarization; Electropolishing; Hysteresis loops; Ion nitriding; Iron nitride; Materials Science; Mechanical polishing; Pitting (corrosion); Plasma; Scrubbers; Solid solutions; Structural Materials; Surface roughness; Thickness; Tribology; Uniform attack (corrosion); Washing
• ISSN: 2397-2106
• DOI: 10.1038/s41529-024-00474-6

In this investigation, electropolishing and plasma ion nitriding are applied to super austenitic stainless steel for the purpose of improving its corrosion and pitting resistance. Electrochemical experiments are conducted with washing water collected directly from the ship’s scrubber. After electropolishing, the surface roughness is improved by about 73.6% compared to mechanical polishing. After plasma ion nitriding, CrN (precipitate), Fe 4 N (compound), and γ N (solid solution) are observed on the surface. The thickness of the layer formed on the surface is measured to be about 10 μm. A hysteresis loop is observed in the cyclic potentiodynamic polarization curves of mechanical polishing and electropolishing, and the areas are calculated as 23.33 mW cm −2 and 0.17 mW cm −2 , respectively. The polarization curve of plasma ion nitriding presents perfect passivation characteristics. Accordingly, mechanical polishing and electropolishing reveal local corrosion, whereas plasma ion nitriding presents a tendency towards general corrosion. In the mechanical polishing, electropolishing, and plasma ion nitriding, the corrosion current densities are 0.665 μA cm −2 , 0.093 μA cm −2 , and 16.47 μA cm −2 , respectively, and the maximum damage depth is observed to grow progressively smaller from plasma ion nitriding to electropolishing and then mechanical polishing.