S. Kertit et B. Hammouti, CORROSION INHIBITION OF IRON IN 1M HCL BY 1-PHENYL-5-MERCAPTO-1,2,3,4-TETRAZOLE, Applied surface science, 93(1), 1996, pp. 59-66
Citations number
50
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical","Materials Science, Coatings & Films
The mode of corrosion inhibition of pure iron due to 1-phenyl-5-mercap
to-1,2,3,4-tetrazole (PMT) in molar HCl is studied through weight loss
and electrochemical steady-state experiments, From the comparison of
results with those obtained using other ''tetrazole''-type organic com
pounds, it is shown that PMT is the best inhibitor and its inhibition
efficiency becomes 98% at 2 x 10(-3)M. Polarisation measurements show
that PMT is a mixed-type inhibitor. PMT acts on the cathodic reaction
without changing the mechanism of the hydrogen evolution reaction. The
PMT appears to function through the general adsorption mode following
the Langmuir adsorption isotherm model. The effect of temperature on
iron corrosion behaviour in both 1M HCl and 1M HCl+ 10(-3)M PMT have b
een studied. The inhibition efficiency of PMT is temperature-independe
nt in the range 20-45 degrees C, The associated activation corrosion a
nd adsorption energy has been determined.