Early Corrosion Characterization of 316 Stainless Steel (Passivated in Supercritical Water with Na 3 PO 4 ) in Subcritical Water Containing Oxygen and NaCl
作者： Shuwei Guo , Donghai Xu , Zhijiang Ma , Jianqiao Yang , Yanmeng Gong
DOI: 10.1007/S11665-020-04701-4
关键词:
摘要: Corrosion has severely hindered the development and application of high-temperature hydrothermal oxidation technologies for disposing chloride-containing organic wastewater. This study explored early corrosion behaviors 316 stainless steel (316 SS) (UNS S31600), passivated by sodium phosphate (Na3PO4) in supercritical water advance, subcritical (at 100, 160, 230, 300 °C 25 MPa) having high contents oxygen (O2) chloride (NaCl) 50 h. The results show that rate phosphate-passivated SS was approximately half (pretreated without Na3PO4) under same conditions. surface oxides consisted Cr2O3, Fe2O3, CrPO4, FePO4, Ni3(PO4)2. passivation pretreatment with Na3PO4 could form a stable protective oxide film containing phosphates. These phosphates significantly improved resistance (containing chloride) preventing corrosive substances from contacting alloy substrate.
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