Gravimetrical and surface morphology studies of corrosion inhibition effects of a 4-aminoantipyrine derivative on mild steel in a corrosive solution

• M. Hanoon¹, D.S. Zinad², A.M. Resen¹ and A.A. Al-Amiery²

¹ Production engineering and metallurgy, University of Technology, Baghdad 10001, Iraq
² Applied Science Department, University of Technology, Baghdad 10001, Iraq

Abstract: Corrosion inhibitors are used to protect mild steel surface from corrosive solutions. A corrosion inhibitor is considered as a substance that, when added at a low concentration to acidic or basic environments, will reduce the dissolution of a metal surface. A new corrosion inhibitor derived from antipyrine, namely, 4-((4-(dimethylamino)benzylidene)amino)antipyrine (DBAA), was synthesized and fully characterized by Fourier transform infrared, proton nuclear magnetic resonance and carbon-13 nuclear magnetic resonance spectroscopic techniques and by CHN micro elemental analysis. The corrosion inhibition efficiency of 4-((4-(dimethylamino)-benzylidene)amino)antipyrine in 1 M hydrochloric acid solution on mild steel (MS) surface was investigated using gravimetrical analysis technique. The inhibition efficiency, corrosion rate, mechanism of inhibition and adsorption characteristics were estimated. Scanning electron microscopy (SEM) was used as a second technique to evaluate the new synthesized compound (DBAA) as a corrosion inhibitor. Excellent inhibitive performance for DBAA was determined by gravimetrical analysis. The maximum corrosion inhibition efficiency of 95.1% was obtained at a concentration of 0.5 mM at 303 K. The inhibition efficiency increases with an increase in the inhibitor concentration but decreases with an increase in the temperature. This study confirms that DBAA obeys the Langmuir adsorption isotherm. A SEM study of the morphology of tested coupons revealed that the surfaces of mild steel coupons were smoother with addition of DBAA in hydrochloric acid environment.

Keywords: DBAA, corrosion inhibitor, antipyrine, SEM, adsorption

Int. J. Corros. Scale Inhib., 2020, 9, no. 3, 953-966 PDF (532 K)
doi: 10.17675/2305-6894-2020-9-3-10

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