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 selfsealing 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] | 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(02):248-252. |
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