Investigation shows enhanced corrosion resistance in 316 stainless steel in wastewater, suggesting improved longevity for electrochemical applications.
The electrochemical properties and corrosion resistance of 316 stainless steel (SS316), a commonly used electrode material in electrochemical phosphorus recovery systems, were systematically investigated in simulated wastewater (WW) and an equivalent NaCl solution. A comprehensive suite of electrochemical techniques (chronoamperometry, cyclic voltammetry, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS)) and surface characterization methods (SEM, XRD) was employed. The results revealed that WW exhibited enhanced cathodic activity and the formation of a more stable, protective surface film on SS316, attributed to complex ionic interactions that mitigate chloride-induced corrosion. In contrast, SS316 in the NaCl solution showed significant susceptibility to passive layer breakdown and localized corrosion. EIS analyses further confirmed improved interfacial stability and restricted charge transfer in WW over time, in stark contrast to the progressive passive layer degradation in NaCl. Surface analyses corroborated these findings, showing limited surface attack in WW compared to distinct localized corrosion features in NaCl. These findings indicate that competing ionic species in WW effectively mitigate chloride aggressiveness, enhance SS316 stability, and suggest improved electrode longevity and reliability for practical electrochemical phosphorus recovery applications.
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Toorani et al. (2025) studied this question.
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