| Mechanism of zinc electroplating in alkaline zincate solution |
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| 作者姓名： | 彭文杰 王云燕 |
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| 作者单位： | School of Metallurgical Science and Engineering Central South University，School of Metallurgical Science and Engineering，Central South University，Changsha 410083，China，Changsha 410083，China |
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| 摘 要： | The cathodic deposition properties and mechanism of Zn in alkaline zincate solution were studied by electrochemical techniques. The results show that Zn2 exists in the alkaline solution in the form of Zn(OH)42-. The apparent activation energy of the electrode reaction is 38.93 kJ/mol, which indicates that the discharge of Zn(OH)42- on cathode is controlled by electrochemical polarization, and accompanied by a preceding chemical reaction. The diffusion coefficient of Zn(OH)42- is 2.452×10-6 cm2/s. Zn(OH)2 is the species directly discharged on the cathode surface. Based on the above results the mechanism of zinc electroplating in alkaline zincate solution was put forward. The discharged species is Zn(OH)2 formed from the preceding chemical reaction, which becomes Zn(OH)ad when gaining one electron, and then gaining the second electron to become Zn. The first electron gaining step is rate determining one.
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| 关 键 词： | 锌 电镀技术 锌酸盐 碱性物质 |
| 收稿时间： | 8 May 2006 |
| 修稿时间： | 2006-05-08 |
Mechanism of zinc electroplating in alkaline zincate solution |
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| Peng Wen-jie,and Wang Yun-yan.Mechanism of zinc electroplating in alkaline zincate solution[J].Journal of Central South University of Technology,2007,14(1):37-41. |
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| Authors: | Peng Wen-jie and Wang Yun-yan |
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| Affiliation: | School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: | The cathodic deposition properties and mechanism of Zn in alkaline zincate solution were studied by electrochemical techniques.
The results show that Zn2+ exists in the alkaline solution in the form of Zn(OH)
4
2−
. The apparent activation energy of the electrode reaction is 38.93 kJ/mol, which indicates that the discharge of Zn(OH)
4
2−
on cathode is controlled by electrochemical polarization, and accompanied by a preceding chemical reaction. The diffusion
coefficient of Zn(OH)
4
2−
is 2.452 × 10−6 cm2/s. Zn(OH)2 is the species directly discharged on the cathode surface. Based on the above results the mechanism of zinc electroplating
in alkaline zincate solution was put forward. The discharged species is Zn(OH)2 formed from the preceding chemical reaction, which becomes Zn(OH)ad when gaining one electron, and then gaining the second electron to become Zn. The first electron gaining step is rate determining
one.
Foundation item: Project(50274073) supported by the National Natural Science Foundation of China |
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| Keywords: | Zn electroplating mechanism alkaline zincate |
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