带冷喷Al/Al2O3涂层的20号碳钢管道在保温层下的腐蚀行为
Corrosion Behavior of 20# Carbon Steel with Cold Sprayed Al-Al2O3 Coatings under Insulation
摘 要
采用浸泡试验模拟涂层管道在保温层下的腐蚀，并通过腐蚀失重法、宏观腐蚀形貌和显微结构观察以及微区成分分析，研究了80℃时，在0.01%（质量分数，下同）NaCl、0.1% NaCl以及1% NaCl溶液中，三种涂层（喷涂粉末分别为100% Al、70% Al+30% Al2O3和50% Al+50% Al2O3）对20号碳钢管道的防护作用。结果表明：当碳钢管道表面冷喷Al/Al2O3涂层后，管道具有较好的抗保温层下腐蚀性能。且当喷涂粉末为纯铝粉时，涂层的耐蚀性最好，加入陶瓷相Al2O3后，涂层的沉积厚度与强度均提高，但腐蚀保护效率存在一定程度的下降。综合考虑涂层的耐蚀性和强度，喷涂粉末为70% Al+30% Al2O3时所得到涂层最适于工程上使用。
冷喷涂
铝/氧化铝涂层
NaCl溶液
corrosion under insulation (CUI)
cold spray
alumium/alumina coating
NaCl solution
Abstract
Immersion tests were conducted to simulate the corrosion under insulation (CUI) in 0.01%, 0.1% and 1% NaCl solution at 80℃. Corrosion protection performance of three different coatings (initial spray powder were 100% Al, 70% Al+30% Al2O3 and 50% Al+50% Al2O3 respectively) on 20# carbon steel pipe was analyzed by weight loss, macro-appearance, microstructure and chemical component analysis.The results showed that cold sprayed Al/Al2O3 coating could protect the pipe substance from corrosion under insulation effectively. When Al2O3 was added into spray powder, the deposition efficiency and hardness increased, but the corrosion resistance decreased. Overall, considering both corrosion resistance and strength, the coating sprayed with 70% Al+30% Al2O3was most suitable for using in engineering.
中图分类号 TG174.4 DOI 10.11973/fsyfh-201701003
所属栏目 试验研究
基金项目 江苏省普通高校研究生科研创新计划（CXLX12_0434）；江苏省教育厅自然科学基金（08KJB430007）
收稿日期 2015/10/29
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引用该论文: BAI Xiao-min,TANG Jian-qun,LÜ,Xiao-liang,GONG Jian-ming. Corrosion Behavior of 20# Carbon Steel with Cold Sprayed Al-Al2O3 Coatings under Insulation[J]. Corrosion & Protection, 2017, 38(1): 11
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参考文献
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【2】GOLDBERG L. Take a systems approach to corrosion under insulation[J]. Chemical Engineering Progress,2000,96(3):63-67.
【3】姜莹洁,巩建鸣,唐建群. 20钢在不同模拟条件下的保温层下腐蚀行为[J]. 机械工程材料,2011,35(12):66-70.
【4】BAY X M,TANG J Q,GONG J M. Failure analysis for the welded elbow at the bottom of the rectifying tower in the alcohol evaporation system[J]. Journal of Failure Analysis and Prevention,2013,13(4):496-501.
【5】黄赟. 保温层下金属材料的腐蚀与防护[J]. 石油化工腐蚀与防护,2013,30(3):15-19.
【6】葛文祥,李相波,程旭东,等. 金属陶瓷涂层制备技术及其后处理工艺研究进展[J]. 材料开发与运用,2011(4):95-99.
【7】THURSTON S H. Method of impacting one metal upon another:US 705701[P]. 1902-08-12.
【8】ROCHEVILLE C F. Device for treating the surface of a workpiece:US 3100724[P]. 1963-08-13.
【9】FITZGERALD B J,STEFAN W. A corrosion under insulation prevention strategy for petrochemical industry piping[J]. Corrosion Management,2004,57:15-19.
【10】SERGEI V K,VLADIMIR F K,REIN M. Cold spray deposition:significance of particle impact phenomena[J]. Aerospace Science and Technology,2005,9(7):582-591.
【11】IRISSOU E. Investigation of Al-Al2O3 cold spray coating formation and properties[J]. Journal of Thermal Spray Technology,2007,16:661-668.
【12】MAEV R G,LESHCHYNSKY V. Air gas dynamic spraying of powder mixtures:theory and application[J]. Journal of Thermal Spray Technology,2006,15(2):198-205.
【13】MAEV R G,LESHCHYNSKY V. Low pressure gas dynamic spray:shear localization during particle shock consolidation[C]//Proceedings of the International Thermal Spray Conference. Washington:[s.n.],2006.
【14】SPENCER K,FABIJANIC D M,ZHANG M X. The use of Al-Al2O3 cold spray coatings to improve the surface properties of magnesium alloys[J]. Surface & Coatings Technology,2009,204(3):336-334.
【15】AFZAL S N,ALI S M A,MUSTAFA C M,et.al. Study of aluminum corrosion in chloride and nitrate media and its inhibition by nitrite[J]. Journal of Nepal Chemical Society,2007,22(1):26-33.
【16】宋诗哲,唐子龙. 工业纯铝在3.5% NaCl溶液中的电化学阻抗谱分析[J]. 中国腐蚀与防护学报,1996,16(2):127-132.
【17】TAO Y S,XIONG T Y,SUN C,et.al. Microstructure and corrosion performance of a cold sprayed aluminium coating on AZ91D magnesium alloy[J]. Corrosion Science,2010,52(10):3191-3197.
【18】MCCAFFERTY E. Sequence of steps in the pitting of aluminum by chloride ions[J]. Corrosion Science,2003,45(7):1421-1438.
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