Pitting Morphology and Electrochemical Characteristics of 304 Stainless Steel Subjected to High-Temperature Exposure under Salt Spray Conditions
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Stainless steel (STS), which contains over 10.5 wt% chromium (Cr), forms a passive film in various envi- ronments, providing superior corrosion resistance compared to conventional steels. However, exposure to marine atmospheric conditions and prolonged high temperatures can compromise the protective function of this passive film, leading to pitting corrosion. This study investigates the pitting behavior and corrosion characteristics of STS304 specimens using salt spray testing (SST) and electrochemical analysis. SST was conducted on both as-received STS304 specimens and those subjected to high-temperature exposure (H_STS304), with cumulative exposure durations of 200, 300, 400, and 500 hours in 100-hour intervals. Analysis of the 3D surface profiles revealed that the frequency and size of pitting corrosion increased with longer salt spray exposure times, a trend that became more pronounced after high-temperature exposure. Additionally, H_STS304 exhibited a less stable passive region during polarization tests and showed sig- nificant potential fluctuations in open circuit potential (OCP) measurements.
Abstract
Stainless steel (STS), which contains over 10.5 wt% chromium (Cr), forms a passive film in various envi- ronments, providing superior corrosion resistance compared to conventional steels. However, exposure to marine atmospheric conditions and prolonged high temperatures can compromise the protective function of this passive film, leading to pitting corrosion. This study investigates the pitting behavior and corrosion characteristics of STS304 specimens using salt spray testing (SST) and electrochemical analysis. SST was conducted on both as-received STS304 specimens and those subjected to high-temperature exposure (H_STS304), with cumulative exposure durations of 200, 300, 400, and 500 hours in 100-hour intervals. Analysis of the 3D surface profiles revealed that the frequency and size of pitting corrosion increased with longer salt spray exposure times, a trend that became more pronounced after high-temperature exposure. Additionally, H_STS304 exhibited a less stable passive region during polarization tests and showed sig- nificant potential fluctuations in open circuit potential (OCP) measurements.