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Abstract The corrosion behavior of the stainless steel lining of the upper tube tank in the high pressure condenser was studied by meas of optical microscope, transmission electron microscope,scanning electron microscope and electron probe, and the causes of corrosion are discussed in this paper.Results of examination showed that two types, of corrosion, i. e., pitting corrosion and stress corrosion cracking, occurred on the 316L stainless steel lining under conditions of urea production. The microcracks of the stress corrosion cracking were initiated at the bottom of pits, aad the macro-cracks observed on the lining surface were in fact constituted by a serie s of pits that were close to one another.
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Received: 25 June 1986
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[1] 松本·原孝顺(日),防止尿素装置中不锈钢腐蚀的电化学研究,化工与通用机械,9,(1983)
[2] 化学工业部化肥司,中荷尿素技术交流资料,(1982)
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[5] 尿素生产中汽提塔的腐蚀、选材和使用,同文献[3]
[6] 化工部防腐蚀技术咨询服务中心,进口汽提法尿素装置高压设备宏观,金相检查和测厚图集,(1982)
[7] 黄嘉琥、尿素生产装置腐蚀与用材的试验研究,《中日化工装置材料技术交流资料汇编》化学,工业出版社出版,(1982)
[8] 吴剑、黄国柱等,不锈钢腐蚀形貌图谱,机械工业部上海材料研究所内部资料,(1982)
[9] Wank lyn,J.N.et.al,J.Nucl.Materials,Ⅵ.154(1959)
[10] 陆世英,张德康,《不锈钢应力腐蚀破裂》,科学出版社,29(1977) |
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