Cactus as a green inhibitor for the corrosion of carbon steel in seawater

Haider Al-Mashhdani, Khulood Abid, Saleh Al-Saadie, Hayfaa Abas, Duha Abdulkareem
unpublished
The inhibitive effects of aqueous Cactus extracts on the corrosion of carbon steel have been investigated; in 3.5% NaClusing polarization measurements. The obtained results show an inhibition efficiency of about 94% in the presence of 1ppm Cactus at 298K. The Cactus extract acts as mixed inhibitor according to the corrosion potentials E corr shifted toward either noble or active direction in the presence of inhibitor. The adsorption of used Cactus compounds on the carbon steel surface obeys
more » ... muir's isotherm. Theapparent activation energy, enthalpy of the dissolution process and the free energy were determined and discussed. 
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