CORROSION INHIBITION EFFECT OF NEWLY SCHIFF BASE ON COPPER METAL IN 1M HYDROCHLORIC ACID

Abstract

The Schiff base N,N'-bis[(3,4-dihydroxy-5-nitrophenyl) methylidene] thiourea (BDHNPMTU) was synthesized by condensation of 3,4-dihydroxcy-5-nitro-benzaldehyde and thiourea. The structure of Schiff base was fully characterized by elemental analysis, FT-IR and UV-Vis methods. The inhibition effect of BDHNPMTU towards the corrosion on copper in 1M HCl was investigated using weight loss measurement technique. Results showed that BDHNPMTU is an effective inhibitor for copper corrosion in 1.0 M HCl solution. It was found that when the concentration of the inhibitors was increased the inhibition efficiency was also increased. Adsorption of the inhibitor on the copper surface followed Langmuir adsorption isotherm. In 4 hr time duration Maximum inhibition efficiency (99%) is shown at highest concentration of inhibitor (5X10-5M).