在超临界水氧化系统中长期服役后316L不锈钢的微观形貌
Micro Morphology of 316L Stainless Steel after Long-Term Service in Supercritical Water Oxidation System
摘 要
采用扫描电镜对长期服役于超临界水氧化（SCWO）系统中的316L不锈钢管母材和焊缝处的微观形貌进行了观察，并分析了其腐蚀机理。结果表明：不锈钢管内壁边缘参差不齐呈现锯齿状，这是表面粗糙度较大和管内介质长时间冲刷腐蚀共同造成的；外壁出现几处晶界腐蚀开裂，这主要与铬元素相关；焊缝处发生比母材更为严重的腐蚀，且内壁出现较为明显的减薄现象，减薄量最大可达0.2 mm。
超临界水氧化
316L不锈钢
裂纹
corrosion
supercritical water oxidation
316L stainless steel
crack
Abstract
Scanning electron microscopy (SEM) was used to observe the micro morphology of the base metal and weld of a 316L stainless steel pipe serviced in supercritical water oxidation (SCWO) system for a long time, and the corrosion mechanism was analyzed. The results indicated that the inner wall of the stainless steel pipe was jagged with uneven edges, which was caused by large surface roughness and long-term erosion corrosion of the medium in pipe. There were several intergranular corrosion cracks in the outer wall, which was mainly related to chromium. The corrosion of the weld was more serious than that of the base material, obvious thinning phenomenon was shown on in the inner wall with the maximum amount of thinning up to 0.2 mm.
中图分类号 TG172 DOI 10.11973/fsyfh-202211003
所属栏目 试验研究
基金项目 江苏省环保科研项目（2012031）；中国石油和化学工业联合会科技指导计划（20121203）
收稿日期 2020/12/18
修改稿日期
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引用该论文: ZENG Xiangrong,LIAO Chuanhua,WANG Changqing,LIU Zhenyun,CHEN Zhen. Micro Morphology of 316L Stainless Steel after Long-Term Service in Supercritical Water Oxidation System[J]. Corrosion & Protection, 2022, 43(11): 13
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参考文献
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【14】赵清万, 廖传华, 姜勇, 等. 酸性介质中超临界水氧化过程对316L不锈钢的腐蚀[J]. 腐蚀与防护, 2020, 41(6):30-33, 38.
【2】MODELL M. Using supercritical water oxidation to destroy tough water[J]. Chemical Week, 1982, 4:21-26.
【3】邹道安. 基于超临界水氧化的生活垃圾渗滤液和焚烧飞灰协同无害化处理研究[D]. 杭州:浙江大学, 2014.
【4】KRITZER P. Corrosion in high-temperature and supercritical water and aqueous solutions:a review[J]. The Journal of Supercritical Fluids, 2004, 29(1/2):1-29.
【5】SUN C W, HUI R, QU W, et al. Progress in corrosion resistant materials for supercritical water reactors[J]. Corrosion Science, 2009, 51(11):2508-2523.
【6】GAO X, WU X Q, ZHANG Z E, et al. Characterization of oxide films grown on 316L stainless steel exposed to H2O2-containing supercritical water[J]. The Journal of Supercritical Fluids, 2007, 42(1):157-163.
【7】XU D H, MA Z J, GUO S W, et al. Corrosion characteristics of 316L as transpiring wall material in supercritical water oxidation of sewage sludge[J]. International Journal of Hydrogen Energy, 2017, 42(31):19819-19828.
【8】TANG X Y, WANG S Z, QIAN L L, et al. Corrosion behavior of nickel base alloys, stainless steel and titanium alloy in supercritical water containing chloride, phosphate and oxygen[J]. Chemical Engineering Research and Design, 2015, 100:530-541.
【9】ZHANG Q, TANG R, YIN K J, et al. Corrosion behavior of hastelloy C-276 in supercritical water[J]. Corrosion Science, 2009, 51(9):2092-2097.
【10】CHOUDHRY K I, GUZONAS D A, KALLIKRAGAS D T, et al. On-line monitoring of oxide formation and dissolution on alloy 800H in supercritical water[J]. Corrosion Science, 2016, 111:574-582.
【11】BEHNAMIAN Y, MOSTAFAEI A, KOHANDEHGHAN A, et al. Internal oxidation and crack susceptibility of alloy 310S stainless steel after long term exposure to supercritical water at 500℃[J]. The Journal of Supercritical Fluids, 2017, 120:161-172.
【12】YANG J Q, WANG S Z, LI Y H, et al. Effect of salt deposit on corrosion behavior of Ni-based alloys and stainless steels in supercritical water[J]. The Journal of Supercritical Fluids, 2019, 152:104570.
【13】CHEN K, WANG J M, DU D H, et al. Characterizing the effects of in situ sensitization on stress corrosion cracking of austenitic steels in supercritical water[J]. Scripta Materialia, 2019, 158:66-70.
【14】赵清万, 廖传华, 姜勇, 等. 酸性介质中超临界水氧化过程对316L不锈钢的腐蚀[J]. 腐蚀与防护, 2020, 41(6):30-33, 38.
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