微量氟化钾对镁合金在商用冷却液中腐蚀行为的影响
Effect of KF Trace Addition on Corrosion Behaviors of Magnesium Alloys in a Commercial Coolant
摘 要
通过失重试验、电化学测试、XPS测试等研究了微量氟化钾对AZ91D、NZK和AM-SC1三种镁合金在商用CALTEX冷却液中腐蚀行为的影响。结果表明: 随着CALTEX冷却液中氟化钾含量的增大, 三种合金在其中的腐蚀速率随之减小, 且氟化钾对AM-SC1和NZK合金腐蚀的抑制作用比较显著; 氟化钾对合金的缓蚀作用是由于氟离子与镁反应, 在合金表面生成难溶的MgF2膜, 阻止了合金的进一步腐蚀。
CALTEX冷却液
耐蚀性能
氟化钾
magnesium alloys
CALTEX coolant
corrosion resistance
KF
Abstract
The corrosion behaviors of AM-SC1, AZ91D and NZK magnesium alloys in CALTEX coolant with KF addition were studied through weight loss experiment, electrochemical test and XPS analysis. Results show that increasing the KF addition in the CALTEX coolant, the corrosion rates of three alloys decreased. The inhibitive effect of KF on corrosion of AM-SC1 and NZK alloys was significant. The reason KF inhabited corrosion of alloys was due to the formation of a layer of low solubility magnesium fluoride film, because of the reaction between fluorinion and magnesium on the surface of alloys, and prevented further corrosion attack to the alloys.
中图分类号 TG174.42
所属栏目 材料性能及其应用
基金项目 国家“863”计划项目(2009AA033501)
收稿日期 2012/1/7
修改稿日期 2012/12/10
网络出版日期
作者单位点击查看
备注袁鹏(1987-), 男, 重庆人, 硕士研究生。
引用该论文: YUAN Peng,GUO Xing-wu,PENG Li-ming,FU Peng-huai,GONG Jia,WU Guo-hua. Effect of KF Trace Addition on Corrosion Behaviors of Magnesium Alloys in a Commercial Coolant[J]. Materials for mechancial engineering, 2013, 37(4): 58～61
袁鹏,郭兴伍,彭立明,付彭怀,龚佳,吴国华. 微量氟化钾对镁合金在商用冷却液中腐蚀行为的影响[J]. 机械工程材料, 2013, 37(4): 58～61
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参考文献
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【3】STALMANN A, SEBASTIAN W, FRIEDRICH H, et al. Properties and processing of magnesium wrought products for automotive applications[J].Properties Advanced Engineering Materials, 2001, 3(12): 969-974.
【4】PELLET R, VAN DE VEN P, AMAEZ D, et al.The role of nitrite and carboxylate ions in repressing diesel engine cylinder liner cavitation corrosion[C]// Corrosion 98. San Diego, California: NACE international, 1998.
【5】WEIR T W. Testing of organic acids in engine coolants[C]// BEAL R E. Engine Coolant Testing: ASTM STP 1335, vol. 4. Philadelphia: American Society for Testing and Materials, 1999: 7-22.
【6】WAGNER, F T, MOYLAN T E, SIMKO S J, et al. Composition of incipient passivating layers on heat-rejecting aluminum in carboxylate and silicate inhibited coolants: correlation with ASTM D 4340weight losses[C]// BEAL R E. Engine Coolant Testing: ASTM STP 1335, vol. 4. Philadelphia: American Society for Testing and Materials, 1999: 23-42.
【7】SALES B, DELGADILLO G. Corrosion control in cooling systems of heavey-duty diesel engines[J].Corrosion Reviews, 1995, 13(2/4): 245-260.
【8】MERCER A D. Corrosion inhibitors in internal combustion engine cooling systems[M].UK: The Institute of Materials, Corrosion Inhibitors, 1994: 58-63.
【9】WOODWARD S M, GERSHUN A V. Characterisation of used engine coolant by statistical analysis[EB/OL].[2012-01-07].http: //www.astm.org/DIGITAL_LIBRARY/STP/PAGES/STP25169S.htm.
【10】OAKES, B D. Cavitation corrosion[C]//AILOR W H. Engine Coolant Testing: State of the Art, ASTM STP 705.[S.l.]: American Society for Testing and Materials, 1980: 284-294.
【11】SONG G, ATRENS A, STJOHN D, et al. The electrochemical corrosion of pure magnesium in 1 N NaCl[J].Corrosion Science, 1997, 39 (5): 855-875.
【12】SONG G, ATRENS A, STJOHN D, et al. The anodic dissolution of magnesium in chloride and sulphate solutions[J].Corrosion Science, 1997, 39(10/11): 1981-2004.
【13】SONG G, ATRENS A, WU X, et al. Corrosion behaviour of AZ21, AZ501 and AZ91 in sodium chloride[J].Corrosion Science, 1998, 40(10): 1769-1791.
【14】SONG G, ATRENS A, DARGUSCH M. Influence of microstructure on the corrosion of diecast AZ91D[J].Corrosion Science, 1999, 41(2): 249-273.
【15】SONG G, STJOHN D. Corrosion of magnesium alloys in commercial engine coolants[J].Materials and Corrosion, 2005, 56 (1): 15-23.
【16】BETTLES C J, Forwood C T, STJOHN D, et al. Magnesium technology[M].Berlin: Springer Berlin Heidelberg, 2006.
【17】BETTLES C J, FORWOOD C T, GRIFFITHS J R. A new magnesium alloy suitable for powertrain applications[J].SAE Transactions, 2003, 112(5): 726-732.
【18】CHANG J W, GUO X W, FU P H, et al. Effect of heat treatment on corrosion and electrochemical behaviour of Mg-3Nd-0.2 Zn-0.4 Zr (wt.%)alloy[J].Electrochimica Acta, 2007, 52(9): 3160-3167.
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