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| CORROSION RESISTANCE OF COLD-SPRAYED Zn-50Al COATINGS IN SEAWATER |
| LI Haixiang; LI Xiangbo; SUN Mingxian; WANG Hongren; HUANG Guosheng |
| State Key Laboratory for Marine Corrosion and Protection; Luoyang Ship Materials Research Institute (LSMRI); Qingdao 266071 |
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Abstract 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.
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Received: 28 November 2008
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Corresponding Authors:
LI Xiangbo
E-mail: lixb@sunrui.net
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