THERMODYNAMIC AND KINETIC STUDY OF ZINC BIS-(DIPALMITHYL DITHIOPHOSPHATE) ACTIVITY AS ANTI-CORROSION ADDITIVE-FATTY ACID BASED THROUGH POTENTIODYNAMIC POLARIZATION TECHNIQUE
ABSTRACT: Zinc
bis-(dipalmithyl dithiophosphate) (ZDTP16) is one product variant of zinc
dialkyl dithiophosphate (ZDTP)-fatty acid based having function as corrosion
inhibitor. By using 3% of effective dose for the application, its effectiveness
of ZDTP16 corrosion inhibition will achieve 97% and it will be able to decrease
Cu metal corrosion rate from 0.152 to 0.004 mm per year. Thermodynamic and kinetic
parameter verification indicates the decreasing of spontaneity and corrosion
rate by existence of ZDTP16 inhibitor. Gibbs free energy transition corrosion
of Cu metal in electrolyte medium is measured in corrosion simulator increased
from +85.22 to +91.77 kJ mol-1, while its activation energy increased from
+16.66 to +33.68 kJ mol-1. Morphology observation of Cu metal substrate surface
using SEM-EDX shows that the adsorption of ZDTP16 at substrate surface is able
to protect surface from corrosion indicated by the existence of Zn, P, S, and C
constituents representing composer atoms of ZDTP16, and the decreasing of Cl-
corrosive constituent at substrate surface.
Author: Komar Sutriah, Zainal
Alim Mas’ud, Mohammad Khotib, Denar Zuliandanu
Journal Code: jpkimiagg160086
