利用电化学方法和微观测试手段，研究了冷喷涂 Zn-50Al涂层在天然海水环境中的耐蚀性能。研究表明，与纯锌、纯铝涂层相比，对于钢基体，锌铝复合涂层具有更加合适的阴极保护电位，可以大大提高防护寿命；海水环境中涂层表面会形成一层致密稳定的腐蚀产物膜，能有效阻止腐蚀介质向涂层内部的渗透，涂层会保持在一个较低的腐蚀速度。
The corrosion behaviors of the cold-sprayed Zn-50Al coatings in seawater were characterized by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The X-ray diffraction (XRD) results of corrosion products and scanning electron microscopy (SEM) analysis of corrosion surface were used to comparatively investigate the corrosion properties of Zn/Al coatings, and to study the self-sealing mechanism. The results indicated that the better corrosion resistance of cold-sprayed Zn-50Al coatings compared with Zn coatings due to the better self-sealing effect which effectively prevents further seawater corrosion. It has more appropriate cathodal protection potential than Al coatings and low corrosion rate than Zn coatings, the corrosion rate of the Zn-50Al coatings retained a low level with time.
参考文献
| [1] | Alkimov A P, Kosarev V F, Papyrin A N. A method of cold gas dynamic deposition [J]. Dokl. Akad. Nauk, 1990, 315(5):1062-1065[2]Rosbrook T, Thomason W H, Byrd J E. Flame sprayed aluminum coatings used on subsea components [J]. Mater. Performance,1989, 28(9): 34-38[3] Gilmore D L, Dykhuizen R C, Neiser R A, et al. Particle velocity and deposition efficiency in the cold spray process [J]. J. Therm. Spray Technol, 1999, 8(4):576-582 [4]Song S Z, Tang Z L. An electrochemical impedance analysis on aluminium in 3.5 NaCl solution [J]. J. Chin. Soc. Corros. Prot.,1996, 16(2): 127-132[5](宋思哲, 唐子龙. 工业纯铝在3.5 NaCl溶液中的化学阻抗谱分析 [J]. 中国腐蚀与防护学报, 1996, 16(2): 127-132)[6]Wei B M. Fundamentals and Application of Metals Corrosion [M]. Beijing: Chemistry Industry Press, 2002[7](魏宝明. 金属腐蚀理论及应用 [M]. 北京：化学工业出版社, 2002)[8]Urchurtu Chavarin J. Electrochemical investigations of the activation mechanism of aluminum corrosion [J]. Mater. Lett., 1991, 47: 472-479[9]Li Y, Wei X L, Feng F L. Co-precipitation of nano-crystalline corrosion products on hot dip Zn-Al alloy coating [J]. Trans. Nonferrous Met. Soc. China, 2001, 11(2) : 248-252[10](李焰, 魏绪钧, 冯法伦. 热浸锌铝合金镀层表面纳米晶腐蚀产物共沉积机理 [J]. 中国有色金属学报, 2001, 11(2): 248-252)[11] Hitzig J, Junttner K, Lorentz W J, et al. AC-impedance measurements on porous aluminum oxide films [J]. Corros.Sci, 1984, 24(3):945-952[12] Hitzig J, Junttner K, Lorentz W J. AC-impedance measurements on corroded porous aluminum oxide films [J]. J. Electrochem. Soc, 1986, 133(5):887-892[13] Hoar T P, Wood G C. The sealing of porous anodic oxide films on aluminum [J]. Electrochim. Acta, 1962, 7:333-353[14] Suay J J,Gimenez E, Rodriguez T, et al. Characterization of anodized and sealed aluminium by EIS [J]. Corros. Sci, 2003, 45(2):611-626 |
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