|
|
|
| EFFECT OF ORGANIC TOP COATING ON ANTICORROSION PERFORMANCE OF SINTERED Zn-Al COATING |
| WANG Jun1;2; LI Ning2; WANG Jia1; XU Likun2 |
1. College of Chemistry and Chemical Engineering; Ocean University of China; Qingdao 266100
2. State Key Laboratory for Marine Corrosion and Protection; Luoyang Ship Material Research Institute; Qingdao 266071 |
|
|
|
|
Abstract Composite coating was prepared by adherence of the epoxy Al-rich coating on sintered Zn-Al coating, in order to improve the anticorrosion performance of Zn-Al coating in seawater. The adhesion of sintered Zn-Al coating and composite coating were tested by cross cut test. The two different coatings were observed by scanning electron microscope (SEM). The anticorrosion performances of the two different coatings were studied by means of immersion test in seawater and neutral salt spray test. The corrosion electrochemical behaviors of the two different coatings were studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results show that the composite coating is more compact than the Zn-Al coating. It exhibits better waterproof performance than the Zn-Al coating. The epoxy Al-rich coating could effectively prevent corrosive species attacking. The composite coating exhibits obviously better anticorrosion performance than the Zn-Al coating. A typical Warburg impedance character appears at the beginning of corrosion process of the composite coating；Al flakes of the epoxy coating dissolve and exert sacrificial anode effects with the penetration of erosive species. The organic top coating improves the application of Zn-Al coating in seawater.
|
|
Received: 03 September 2008
|
|
|
|
Corresponding Authors:
WANG Jia
E-mail: jwang@houc.edu.cn
|
| [1] Li G Y, Lian J S, Jiang Z H, et al. Study and Application of the zinc-aluminum coating [J]. Heat Treat. Met., 2003, 28(9): 8-12
(李光玉, 连建设, 江中浩等. 锌铝涂层的研究开发与应用 [J]. 金属热处理,2003, 28(9): 8-12)
[2] Cho K W, Rao V. S, Kwon H S. Microstructure and electrochemical characterization of trivalent chromium based conversion coating on zinc [J]. Electrochim. Acta, 2007, 52(13):4449-4456
[3] He Y D, Li D Z, Wang D R, et al. Corrosion resistance of Zn-Al co-cementation coatings on carbon steels [J]. Mater. Lett.,2002, 56(4): 554-559
[4] Yu X W, LI Z S, Cao C N. Research on zinc-chrome film formation and corrosion resistance mechanism [J].Automob. Technol. Mater., 2000(9): 12-14
(于兴文, 李自松, 曹楚南. 锌铬膜成膜过程及耐腐蚀机理的研究 [J]. 汽车工艺与材料, 2000(9): 12-14)
[5] Xu L S, Li W D. Technique of “DACROMET” and application [J].Des. Manuf., 2004(6): 39-42
(许乐生, 李卫东. “达克罗”技术及其应用 [J]. 设计与制造, 2004\linebreak(6): 39-42)
[6] Chen S Y, Liu C S, Liu H Y, et al. Preparation of ultrafine Zn flake for Zn-Cr thin coating [J]. Mater. Prot., 2003, 36(1): 39-41
(陈岁元, 刘常升, 刘海亚等. 锌铬膜涂料用微细Zn片的制备及研究 [J]. 材料保护, 2003, 36(1): 39-41)
[7] Luo J, Zhang Z H, Zhang Z D, et al. Microstructure and properties of Dacromet coatings on car surface [J]. Foundry Technol., 2007, 28(7): 974-976
(罗静, 张祖恒, 张毓栋等. 汽车表面达克罗防腐涂层的组织和性能 [J]. 铸造技术, 2007, 28(7): 974-976)
[8] Wu Z H, Luo M. Use and development trend of dacromet technology [J]. China Coatings, 2008, 23(1): 55-57
(吴宗汉, 罗曼. 达克罗技术的应用及发展方向 [J]. 中国涂料, 2008, 23(1): 55-57)
[9] Liu J G, Gong G P, Yan C W. EIS study on the anti-corrosion performance of polymer/dacromet composite systems in 3.5\% NaCl solution [J]. J.Chin. Soc. Corros. Prot., 2006, 26(2): 89-93
(刘建国, 龚高平, 严川伟. 聚合物/达克罗复合涂层体系在3.5%NaCl中耐腐蚀性能的EIS研究 [J]. 中国腐蚀与防护学报, 2006, 26(2): 89-93)
[10] Xiao H S. Inspective methods of Dacromet treatment [J]. Electroplating Finishing, 2004, 23(1): 45-48
(肖合森. 达克罗处理的检测方法 [J]. 电镀与涂饰, 2004, 23(1): 45-48)
[11] Liu J G, Gong G P, Yan C W. EIS study of corrosion behavior of organic coating/Dacromet composite systems [J]. Electrochim.Acta, 2005, 50(16): 3320-3332
[12] Deflorian F, Fedrizzi L, Rossi S, et al. Organic coating capacitance measurement by EIS: ideal and actual trends [J]. Electrochim. Acta,1999, 44: 4243-4249
[13] Liu Y, Zhu Z X, Ma J, et al. Study on self-sealing mechanism of Zn and Zn-Al coating based on electrochemical impedance spectroscopy [J].China Surf. Eng., 2005, (2): 27-30
(刘燕, 朱子新, 马洁等. 基于电化学阻抗谱的Zn及Zn-Al涂层的自封闭机理研究 [J]. 中国表面工程, 2005, (2): 27-30) |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
