Abstract
A study has been made to investigate the mechanism of dezincification and elelctrochemical behaviour 70/30 brass in sulphuric acid in absence and presence of Zinc Organa Amino Phosphate (ZOAP) inhibitor using the weight loss method, solution analysis and electrochemical technique. Attacked surfaces were analyzed by optical metallography and X -ray analysis. Results showed that 20 AP inhibitor is able to minimize the rate of dezincification due to the formation of a C4H6 (NH2)4 Zn3 (P3 O10)2. 9H2O complex compound on the metal surface.
Highlights
:n Inhibitive efficiency: FrOID table and Fig. (I) it is clear that zinc organo runino phosphate. (ZOAP) gives 86%
Gupta and others [2] showed that the orgaruc inhibitors act as proton acceptors, releasing H+ ions into the sulphuric acid soJution and forming an organo Inetallic complex layer with the metal ions on the surface of the meta], inhibiting the corrosion
In ZOAF, the Amino group acts as the reaction center, on which is fanned a complex with the metal ions
Summary
:n Inhibitive efficiency: FrOID table and Fig. (I) it is clear that ZOAP gives 86%. efficiency at its optimum concentration of IlnlfL. The lower i.nh~bitive efficiency of the compounds prior to 24 hrs may be due to the presence of an imperfection complex protective film on the smface of the metal not capable of llllubiting the dissolution of zinc and copper ions frOID brass. The general shift of steady state potential in the nobbler direction indicates greater polarization of the anodic than cathodic processes at the brass surface with increasing ZOAP concentrations. (7) shows the result of X-ray diffraction analysis of brass surface exposed to solution without and with ZOAP inhibitor ( llIIlIL) for 24 hrs. It is clear- that a complex compound of C4H6 (NH2) Zn3 Tins confirms that the in.hibition is due to the formation of some complex film with metal ions
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