Inhibition effect of the synergistic properties of 4-methyl-norvalin and 2-methoxy-4-formylphenol on the electrochemical deterioration of P4 low carbon mold steel
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De Gruyter
Abstract
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Study of the synergistic inhibition properties
of the combined admixture of 4-methyl-norvalin and 2-
methoxy-4-formylphenol (non-toxic organic compounds)
on the corrosion of P4 low carbon mold steel in 1.5 M
H2SO4 and HCl solution was performed with weight loss
measurement, potentiodynamic polarization and optical
microscopy analysis. Results obtained showed the inhibition
efficiency of the admixed compound performed above
the value for effective corrosion inhibition at very low concentrations
in H2SO4 solution. However, from mid concentration
to the highest concentration studied, the inhibition
efficiency of the compound was above 85% from
electrochemical tests. In HCl solution the inhibition efficiency
of the compound was well above 80% and 90%
for weight loss and polarization tests at all concentration
studied. Anodic corrosion inhibition mechanism was determined
for the compound in H2SO4 according to Freundlich
and Frumkin adsorption isotherms due to weak
Van der Waals attraction between the inhibitor molecules
and the steel’s surface. The mechanism of corrosion inhibition
in HClwas calculated to be cathodic type according to
Langmuir isotherm model.Morphological images of inhibited
and non-inhibited steel surfaces significantly contrast
each other though the extent of deteriorationwas much severe
for the steel from H2SO4 solution.
Keywords
TJ Mechanical engineering and machinery, TP Chemical technology