Thermal Decomposition Kinetic and Electrochemical Properties of KZn₂(PO₄)(HPO₄)

Abstract:

Thermal decomposition kinetic reaction parameters of KZn2(PO4)(HPO4) was investigated by non-isothermal measurement used in a multivariate non-linear regression analysis. The anticorrosive performance of the phosphate extracts in different pH 3.5% NaCl was studied by polarization and open circuit potential measurements. Kinetics analysis shows that the decomposition of KZn2(PO4)(HPO4) acts as a double-step reaction of : a n order autocatalytic reaction (Cn) with n =1.0791, E1 = 365.06 kJ/ mol, A1 =8.69×1022s−1 is followed by a expended Prout-Tompkins reaction (Bna) with n=2.6548, E2 = 390.91 kJ /mol, A2 = 5.37×1024 s−1. In different pH 3.5% NaCl extracts, KZn2(PO4)(HPO4) functions as a cathodic inhibitor on steel and is even superior to other phosphates in efficiency. The inhibiting efficiency of the pigments on steel decrease in the order: KZn2(PO4)(HPO4) > aluminum zinc phosphate > zinc phosphate ≧ aluminum triphosphate

• Periodical: Advanced Materials Research (Volumes 152-153)
• Pages: 184-191
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.152-153.184
• Online since: October 2010
• Authors: Dong Lian Chen, Shao Mei Ma, Hui Cheng Yu, Ai Qun Yuan, An Ping Liao, Jian Wu
• Keywords: Electrochemistry, Pigment Extract, Potassium Dizinc Phosphate Hydrogenphosphate, Thermal Decomposition Kinetics

References

[1] T A H William, Z Bircsak, L Hannooman, Z H Zhang. Solid State Chemistry, 1998, 136(1): 93-102.

[2] S Neeraj, M L Noy, A K Cheetham. Solid State Science, 2002, 4, 397~404.

[3] A Echavarría, A Simon-Masseron, J L Paillaud, et al. Inorganica Chimica Acta, 2003, 343 (20): 51-55.

[4] A Q Yuan, J Wu , Z Y Huang, K Wu, B L Song, S Liao , Z F Tong. Chinese Journal of Chemistry, 2008, (26)7: 1210-1214.

[5] M A Abd El-Ghaffar, E A M Youssef, N M Abmed. Pigments & Resin Technology, 2004, 33(6): 226 - 232.

[6] R. Naderi, M M Attar. Electrochimica Acta, 2008, 53(18): 5692-5696.

[7] S Vyazovkin. Computational aspects of kinetic analysis: Part C, Thermochimica Acta, 2000, 355(1-2): 155-163.

DOI: 10.1016/s0040-6031(00)00445-7

[8] S Vyazovkin, A Charles. Thermochimica Acta, 1999, 340-341 (14): 53-68.

[9] S. Vyazovkin, W. Linert. Journal of Solid State Chemistry, 1995, 114(2) : 392-398.

[10] R Z Hu, S L Gao, Q Z. Shi et al. Thermal Analysis kinetic. Scientific. Press. Peking. (2008).