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·1060* 北京科技大学学报 第34卷 盐雾时间的延长而增大,这是因为涂层表面出现了 taining environment.Corros Sci,2009,51(10):2355 大量腐蚀产物,电化学反应阻力增大,阻抗谱上表现 [4]Fu D X,Xu B S,Zhang W,et al.Action mechanism of self-seal- 为容抗弧半径逐渐增大.锌铝伪合金涂层经交流阻 ing behavior of Zn-Al-Mg-RE coating in a multilayer coating. Trans Mater Heat Treat,2007,28(2):98 抗谱测试后拟合到的R,和R,值都随腐蚀时间的延 (付东兴,徐滨士,张伟,等.ZnA-MgRE涂层自封闭特性 长而逐渐增大,其数值远大于纯锌涂层.盐雾试验 在复合涂层中的作用机制.材料热处理学报,2007,28(2): 768h后,锌铝伪合金涂层的R,值明显大于纯锌涂 98) 层,说明其腐蚀产物更加致密稳定,R,约为纯锌涂层 5] Rosalbino F,Angelini E,Maccio D,et al.Influence of rare 的5倍,表现出了比纯锌涂层更好的耐蚀性. earths addition on the corrosion behaviour of Zn5%Al (Galfan) alloy in neutral aerated sodium sulphate solution.Electrochim Ac- 3结论 ta,2007,52(24):7107 [6]Lester T,Kingerley D J,Harris S J,et al.Thermally sprayed (1)随盐雾时间延长,纯锌涂层表面生成疏松 composite coatings for enhanced corrosion protection of steel struc- 多孔的胞状腐蚀产物层,腐蚀产物主要为羟基氯化 tures /Proceedings of the 15th Thermal Spray Conference.Nice, 锌(Zn(OH).CL,H,0)、Zn的氧化物(Zn0)及碱式 1998:49 [7]Liu Y,Zhu Z X,Chen Y X,et al.Electrochemical corrosion be- 碳酸盐(Zn5(C03)2(0H)6),盐雾试验768h后,腐 havior of arc sprayed Zn-Al coatings.Trans Nonferrous Met Soc 蚀产物层部分区域发生了龟裂. China,2004,14(Suppl2):443 (2)锌铝伪合金涂层表面生成了致密的腐蚀产 [8]Shaw B A,Moran P J.Characterization of the corrosion behavion 物层,主要为羟基氯化锌(Zn(OH)gCl2H20)、碱式 of zincaluminum thermal spray coatings.Mater Perform,1985, 碳酸盐化合物(Zna.71Aa9(0H),(C0)a14s'xH,0) 24(11):22 [9]El-Mahdy G A,Nishikata A,Tsuru T.AC impedance study on 及尖晶石结构的氧化物(ZA山204),与纯锌涂层相 corrosion of 55%Al-Zn alloy-coated steel under thin electrolyte 比,锌铝伪合金涂层腐蚀产物层更加致密 layers.Corros Sci,2000,42(9)1509 (3)电化学阻抗谱测试结果表明:随着盐雾时间 [10]Marder A R.The metallurgy of zinc-coated steel.Prog Mater 的延长,纯锌涂层的电荷转移电阻R值逐渐增大,腐蚀 Sci,2000,45(3):191 产物电阻R先增大后减小;锌铝伪合金涂层的R和R 1] Ramus Moreira A,Panossian Z,Camargo P L,et al.Zn/55Al 值均逐渐增大,且明显大于纯锌涂层,表现出了更好的 coating microstructure and corrosion mechanism.Corros Sci, 2006,48(3):564 耐蚀性,该结果与腐蚀形貌观察结果相一致 [12]Ma Q H,Yin J P,Dong Z J.Anticorrosion mechanism of thermal spraying aluminum composite coating in marine environment. 参考文献 Mater Prot,2002,35(6):14 [1]Qi X Z,Wei Q,Li Z X,et al.Microstructure and properties of (马青华,尹建平,董作敬.海洋环境热喷涂铝复合涂层保 Al-based coatings prepared by are spraying.Mater Eng,2005 护机理分析.材料保护,2002,35(6):14) (1):20 03] Penney D J,Sullivan J H,Worsley D A.Investigation into the (齐鑫哲,魏琪,栗卓新,等电弧喷涂制备铝基涂层的组织 effects of metallic coating thicknesson the corosion properties of 与性能研究.材料工程,2005(1):20) Zn-Al alloy galvanising coatings.Corros Sci,2007,49 (3): 2]Nuriya H,Suzuki T,Ishikawa K,et al.Corrosion resistance of 1321 thermal sprayed film of Zn,Al and Znl alloy against atmosphere [14]Cao C N.Principles of Electrochemistry of Corrosion.3rd Ed. corrosion.Corros Eng,2002,51(9):404 Beijing:Chemical Industry Press,2008:175 B]Schuerz S,Fleischanderl M,Luckeneder G H,et al.Corrosion (曹楚南.腐蚀电化学原理.3版.北京:化学工业出版社, behaviour of Zn-Al-Mg coated steel sheet in sodium chloride-con- 2008:175)北 京 科 技 大 学 学 报 第 34 卷 盐雾时间的延长而增大,这是因为涂层表面出现了 大量腐蚀产物,电化学反应阻力增大,阻抗谱上表现 为容抗弧半径逐渐增大. 锌铝伪合金涂层经交流阻 抗谱测试后拟合到的 Rr和 Rt值都随腐蚀时间的延 长而逐渐增大,其数值远大于纯锌涂层. 盐雾试验 768 h 后,锌铝伪合金涂层的 Rr值明显大于纯锌涂 层,说明其腐蚀产物更加致密稳定,Rt约为纯锌涂层 的 5 倍,表现出了比纯锌涂层更好的耐蚀性. 3 结论 ( 1) 随盐雾时间延长,纯锌涂层表面生成疏松 多孔的胞状腐蚀产物层,腐蚀产物主要为羟基氯化 锌( Zn5 ( OH) 8Cl2 H2O) 、Zn 的氧化物( ZnO) 及碱式 碳酸盐( Zn5 ( CO3 ) 2 ( OH) 6 ) ,盐雾试验 768 h 后,腐 蚀产物层部分区域发生了龟裂. ( 2) 锌铝伪合金涂层表面生成了致密的腐蚀产 物层,主要为羟基氯化锌( Zn5 ( OH) 8Cl2H2O) 、碱式 碳酸盐化合物( Zn0. 71Al0. 29 ( OH) 2 ( CO3 ) 0. 145 ·xH2O) 及尖晶石结构的氧化物( ZnAl2 O4 ) ,与纯锌涂层相 比,锌铝伪合金涂层腐蚀产物层更加致密. ( 3) 电化学阻抗谱测试结果表明: 随着盐雾时间 的延长,纯锌涂层的电荷转移电阻 Rt值逐渐增大,腐蚀 产物电阻 Rr先增大后减小; 锌铝伪合金涂层的 Rr和 Rt 值均逐渐增大,且明显大于纯锌涂层,表现出了更好的 耐蚀性,该结果与腐蚀形貌观察结果相一致. 参 考 文 献 [1] Qi X Z,Wei Q,Li Z X,et al. Microstructure and properties of Al-based coatings prepared by arc spraying. J Mater Eng,2005 ( 1) : 20 ( 齐鑫哲,魏琪,栗卓新,等. 电弧喷涂制备铝基涂层的组织 与性能研究. 材料工程,2005( 1) : 20) [2] Nuriya H,Suzuki T,Ishikawa K,et al. Corrosion resistance of thermal sprayed film of Zn,Al and Zn-Al alloy against atmosphere corrosion. Corros Eng,2002,51( 9) : 404 [3] Schuerz S,Fleischanderl M,Luckeneder G H,et al. Corrosion behaviour of Zn-Al-Mg coated steel sheet in sodium chloride-con￾taining environment. Corros Sci,2009,51( 10) : 2355 [4] Fu D X,Xu B S,Zhang W,et al. Action mechanism of self-seal￾ing behavior of Zn-Al-Mg-RE coating in a multilayer coating. Trans Mater Heat Treat,2007,28( 2) : 98 ( 付东兴,徐滨士,张伟,等. Zn-Al-Mg-RE 涂层自封闭特性 在复合涂层中的作用机制. 材料热处理学报,2007,28( 2) : 98) [5] Rosalbino F,Angelini E,Macciò D,et al. Influence of rare earths addition on the corrosion behaviour of Zn-5% Al ( Galfan) alloy in neutral aerated sodium sulphate solution. Electrochim Ac￾ta,2007,52( 24) : 7107 [6] Lester T,Kingerley D J,Harris S J,et al. Thermally sprayed composite coatings for enhanced corrosion protection of steel struc￾tures / / Proceedings of the 15th Thermal Spray Conference. Nice, 1998: 49 [7] Liu Y,Zhu Z X,Chen Y X,et al. Electrochemical corrosion be￾havior of arc sprayed Zn-Al coatings. Trans Nonferrous Met Soc China,2004,14( Suppl 2) : 443 [8] Shaw B A,Moran P J. Characterization of the corrosion behavior of zinc-aluminum thermal spray coatings. Mater Perform,1985, 24( 11) : 22 [9] El-Mahdy G A,Nishikata A,Tsuru T. AC impedance study on corrosion of 55% Al-Zn alloy-coated steel under thin electrolyte layers. Corros Sci,2000,42( 9) : 1509 [10] Marder A R. The metallurgy of zinc-coated steel. Prog Mater Sci,2000,45( 3) : 191 [11] Ramus Moreira A,Panossian Z,Camargo P L,et al. Zn /55Al coating microstructure and corrosion mechanism. Corros Sci, 2006,48( 3) : 564 [12] Ma Q H,Yin J P,Dong Z J. Anticorrosion mechanism of thermal spraying aluminum composite coating in marine environment. Mater Prot,2002,35( 6) : 14 ( 马青华,尹建平,董作敬. 海洋环境热喷涂铝复合涂层保 护机理分析. 材料保护,2002,35( 6) : 14) [13] Penney D J,Sullivan J H,Worsley D A. Investigation into the effects of metallic coating thickness on the corrosion properties of Zn-Al alloy galvanising coatings. Corros Sci,2007,49 ( 3 ) : 1321 [14] Cao C N. Principles of Electrochemistry of Corrosion. 3rd Ed. Beijing: Chemical Industry Press,2008: 175 ( 曹楚南. 腐蚀电化学原理. 3 版. 北京: 化学工业出版社, 2008 : 175) ·1060·
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