The inhibition of the corrosion of carbon steel in seawater by diethylene triamine pentamethylene phosphonic acid (DTPMP) and Al3+ has been investigated using weight loss and electrochemical measurements. The results show that 65% inhibition efficiency is achieved with binary system consisting of 250 ppm of DTPMP and 50 ppm of Al3+. Polarization curves indicate that the system is a mixed inhibitor. The surface morphology of the metal surface is examined using the scanning electron microscope.
Corrosion inhibition, Carbon steel, Seawater, SEM