D0L:10.13374/.issn1001-053x.2012.09.010 第34卷第9期 北京科技大学学报 Vol.34 No.9 2012年9月 Journal of University of Science and Technology Beijing Sep.2012 含氯离子环境下锌铝伪合金涂层的耐蚀性及电化学 特性 刘安强)四 肖葵”董超芳” 李晓刚”魏丹2》 1)北京科技大学新材料技术研究院，北京1000832)中国科协学会服务中心，北京100081 ☒通信作者，E-mail:liuag509@yahoo..cn 摘要采用盐雾试验和电化学阻抗谱测试技术研究了纯锌和锌铝伪合金涂层在含氯离子环境中的腐蚀行为和电化学特 性，通过扫描电镜、X射线物相分析等手段研究了原始涂层及腐蚀后的表面形貌和腐蚀产物的相结构，并对两种涂层的腐蚀机 理进行了初步的探讨.随着盐雾时间的增加，纯锌涂层表面逐渐生成疏松多孔的胞状腐蚀产物层，主要腐蚀产物为Z,(0H)g- Cl,H,0、Z0和Zm(C0,)2(0H)。,盐雾试验达到768h后腐蚀产物层局部区域发生龟裂.锌铝伪合金涂层表面生成致密的腐 蚀产物层，主要为Zm(0H)。CL,H,0、Zm.mA9(0H),(C0)as'xH,0及ZnAL,04.电化学阻抗谱测试结果表明：随着盐雾时 间的延长，两种涂层的电荷转移电阻均逐渐增大，但锌铝伪合金涂层的阻抗要明显大于纯锌涂层，表现出了更好的耐蚀性. 关键词锌合金；铝合金：涂层：耐蚀性：盐雾试验：电化学阻抗谱 分类号TG174.4 Electrochemical performance and corrosion resistance of Zn-Al pseudo-alloy coatings in chlorine ion-containing environment LIU An--iang》s,XlA0Ki',DONG Chao-fang》,LI Xiao-gang》,WEIDan2》 1)Institute of Advanced Material and Technology,University of Science and Technology Beijing,Beijing 100083,China 2)Society Service Center,China Association for Science and Technology,Beijing 100081,China Corresponding author,E-mail:liuag509@yahoo.cn ABSTRACT The corrosion behavior and electrochemical characteristics of pure Zn and Zn-Al pseudo-alloy coatings in chlorine ion- containing environment were investigated by salt spray test and electrochemical impedance spectroscopy (EIS).The surface morpholo- gies and phase compositions of the coatings and the corrosion products were analyzed by scanning electron microscopy (SEM)and X- ray diffraction (XRD).A preliminary discussion was carried out on the corrosion mechanisms of the two kinds of the coatings.It is found that the corrosion product layer on the pure zinc coating sample is loose and porous with prolonging test time,the main corrosion products are Zns (OH)sCl,H,O,ZnO and Zns (CO)2(OH),and some areas in the corrosion product layer have cracked after salt spray testing for 768 h.A compact corrosion product layer forms on the zinc-aluminum pseudo-alloy coating with the time prolonging, and the main corrosion products consist of Zns (OH)Cl2 H2O,Zno.Al2 (OH)2(CO3).xH2O and ZnAlO.EIS results indicate that the charge transfer resistance of the two coatings increases during the corrosion process.The impedance of the zinc-aluminum pseu- do-alloy coating is significantly greater than that of the pure zinc coating,showing a better corrosion resistance. KEY WORDS zinc alloys:aluminum alloys:coatings:corrosion resistance:salt spray test:electrochemical impedance spectroscopy ZnA1合金涂层兼具有Zn的电化学活性和Al 洋环境下钢结构件的防腐蚀.近年来，人们对ZAl 的钝化特性，因而其对基体的保护效果要明显优于 基合金涂层的材料设计、制备工艺及防腐性能等方 纯锌和纯铝涂层.ZnAl合金涂层被广泛应用于海 面展开了大量的研究，研制出不同类型的ZAl基 收稿日期：201107-11 基金项目：国家自然科学基金资助项目(50871021)第 34 卷 第 9 期 2012 年 9 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 34 No． 9 Sep． 2012 含氯离子环境下锌铝伪合金涂层的耐蚀性及电化学 特性 刘安强1) 肖 葵1) 董超芳1) 李晓刚1) 魏 丹2) 1) 北京科技大学新材料技术研究院，北京 100083 2) 中国科协学会服务中心，北京 100081 通信作者，E-mail: liuaq509@ yahoo． cn 摘 要 采用盐雾试验和电化学阻抗谱测试技术研究了纯锌和锌铝伪合金涂层在含氯离子环境中的腐蚀行为和电化学特 性，通过扫描电镜、X 射线物相分析等手段研究了原始涂层及腐蚀后的表面形貌和腐蚀产物的相结构，并对两种涂层的腐蚀机 理进行了初步的探讨． 随着盐雾时间的增加，纯锌涂层表面逐渐生成疏松多孔的胞状腐蚀产物层，主要腐蚀产物为 Zn5 ( OH) 8- Cl2H2O、ZnO 和 Zn5 ( CO3 ) 2 ( OH) 6，盐雾试验达到 768 h 后腐蚀产物层局部区域发生龟裂． 锌铝伪合金涂层表面生成致密的腐 蚀产物层，主要为 Zn5 ( OH) 8Cl2H2O、Zn0． 71Al0． 29 ( OH) 2 ( CO3 ) 0． 145 ·xH2O 及 ZnAl2O4 ． 电化学阻抗谱测试结果表明: 随着盐雾时 间的延长，两种涂层的电荷转移电阻均逐渐增大，但锌铝伪合金涂层的阻抗要明显大于纯锌涂层，表现出了更好的耐蚀性． 关键词 锌合金; 铝合金; 涂层; 耐蚀性; 盐雾试验; 电化学阻抗谱 分类号 TG174． 4 Electrochemical performance and corrosion resistance of Zn-Al pseudo-alloy coatings in chlorine ion-containing environment LIU An-qiang1) ，XIAO Kui 1) ，DONG Chao-fang1) ，LI Xiao-gang1) ，WEI Dan2) 1) Institute of Advanced Material and Technology，University of Science and Technology Beijing，Beijing 100083，China 2) Society Service Center，China Association for Science and Technology，Beijing 100081，China Corresponding author，E-mail: liuaq509@ yahoo． cn ABSTRACT The corrosion behavior and electrochemical characteristics of pure Zn and Zn-Al pseudo-alloy coatings in chlorine ion￾containing environment were investigated by salt spray test and electrochemical impedance spectroscopy ( EIS) ． The surface morpholo￾gies and phase compositions of the coatings and the corrosion products were analyzed by scanning electron microscopy ( SEM) and X￾ray diffraction ( XRD) ． A preliminary discussion was carried out on the corrosion mechanisms of the two kinds of the coatings． It is found that the corrosion product layer on the pure zinc coating sample is loose and porous with prolonging test time，the main corrosion products are Zn5 ( OH) 8Cl2H2O，ZnO and Zn5 ( CO3 ) 2 ( OH) 6，and some areas in the corrosion product layer have cracked after salt spray testing for 768 h． A compact corrosion product layer forms on the zinc-aluminum pseudo-alloy coating with the time prolonging， and the main corrosion products consist of Zn5 ( OH) 8Cl2H2O，Zn0． 71Al0． 29 ( OH) 2 ( CO3 ) 0． 145 ·xH2O and ZnAl2O4 ． EIS results indicate that the charge transfer resistance of the two coatings increases during the corrosion process． The impedance of the zinc-aluminum pseu￾do-alloy coating is significantly greater than that of the pure zinc coating，showing a better corrosion resistance． KEY WORDS zinc alloys; aluminum alloys; coatings; corrosion resistance; salt spray test; electrochemical impedance spectroscopy 收稿日期: 2011--07--11 基金项目: 国家自然科学基金资助项目( 50871021) Zn-Al 合金涂层兼具有 Zn 的电化学活性和 Al 的钝化特性，因而其对基体的保护效果要明显优于 纯锌和纯铝涂层． Zn-Al 合金涂层被广泛应用于海 洋环境下钢结构件的防腐蚀． 近年来，人们对 Zn-Al 基合金涂层的材料设计、制备工艺及防腐性能等方 面展开了大量的研究，研制出不同类型的 Zn-Al 基 DOI:10.13374/j.issn1001-053x.2012.09.010