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| EFFECT OF TMA ON STRUCTURE AND CORROSION RESISTANCE OF ALUMINUM COATINGS FROM MOLTEN SALT |
| WANG Xiaohua1; YANG Zhanhong1; LI Wangxing2; CHEN Jianhua2;WANG Shengwei1; LI Jingwei1 |
1. College of Chemistry and Chemical Engineering; Central South University; Changsha 410083
2. Zhengzhou Research Institute; Aluminum Corporation of China Limited; Zhengzhou 450041 |
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Abstract With the presence of tetramethylammonium chloride the aluminum coatings were obtained on iron substrate in eutectic chloride molten salt by D.C. plating. Scanning electron microscope(SEM), X-ray diffraction(XRD) and polarization curves were used to test the surface morphology, microstructure and corrosion resistance of the obtained coatings. Effect of tetramethylammonium(TMA) on Al deposition mechanism in the molten salt was investigated by cyclic voltammogram. The results showed that optimum currency efficiency of 93.6 % was obtained when mass fraction of TMA reached to 1.0%. Aluminum coatings obtained in eutectic chloride molten salt is acicular and has (200) preferred orientation face-centered cubic structure, while that obtained in TMA added molten salt is irregular. Pitting corrosion potential of aluminum coating was enhanced 0.12 V and the extent of irreversibility was enlarged by adding TMA.
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Received: 27 November 2007
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Corresponding Authors:
YANG Zhanhong
E-mail: zhyang@mail.csu.edu.cn
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