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Acta Physico-Chimica Sinica  2002, Vol. 18 Issue (11): 1023-1028    DOI: 10.3866/PKU.WHXB20021113
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Adsorption of DDA in Phosphoric Acid Solution on Zinc Surface and Its Corrosion Inhibition
Mu Guan-Nan;Liu Guang-Heng;Zhang Jin
Department of Chemistry, Yunnan University, Kunming 650091
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Abstract  The weight-loss and electrochemical methods were used to investigate the corrosion behavior of metallic zinc in phosphoric acid solutions with or without dodecyl amine(DDA). The corrosion rate expressions were formulated and the corresponding kinetic parameters and thermodynamic constants were calculated. From the results of electron spectroscopy for chemical analysis (XPS), it was found that, over the temperature range of 40~70 ℃, zinc showed good self corrosion inhibition due to the coverage of Zn(OH)x produced. On the other hand, in the temperature range of 30~40 ℃, since DDA-H3PO4 and several other compounds were adsorbed on zinc surface, DDA exhibited powerful corrosion inhibition. The mechanism for corrosion inhibition was discussed by the adsorption theory.

Key wordsZinc      Phosphoric acid      Dodecyl amine (DDA)      Adsorption      Corrosion inhibition     
Received: 04 January 2002      Published: 15 November 2002
Corresponding Authors: Mu Guan-Nan     E-mail: guannan@public.km.yn.cn
Cite this article:

Mu Guan-Nan;Liu Guang-Heng;Zhang Jin. Adsorption of DDA in Phosphoric Acid Solution on Zinc Surface and Its Corrosion Inhibition. Acta Physico-Chimica Sinica, 2002, 18(11): 1023-1028.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20021113     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2002/V18/I11/1023

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