Thermal Decomposition Kinetic And Electrochemical Properties Of Kzn2(Po4)(Hpo4)

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 : an order autocatalytic reaction (Cn) with n = 1.0791, E-1 = 365.06 kJ/mol, A(1) =8.69 x 1022s(-1) is followed by a expended Prout-Tompkins reaction (Bna) with n=2.6548, E-2 = 390.91 kJ/mol, A(2) = 5.37 x 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