Nanoparticles Coatings to Reduce Corrosion of Carbon Steel in Artificial Seawater

Abstract

Nanoparticles of Titania, Alumina, and Zirconia coatings were used on carbon steel specimens using the atomization method. An airbrush was used with nitrogen gas to coat nanoparticles on carbon steel surfaces. The coatings percentage include 100% nano TiO2, 50% nano TiO2 – 50% nano Al2O3and 50% nano TiO2– 50% nano ZrO2. The FESEM was used in this experiment. The particle size ranged from (28.42 - 44.31) nm, (34.77 - 47.15) nm, and (34.51 - 51.46) nm for titania, titania-alumina, and titania-zirconia coating, respectively. Furthermore, EDS analysis indicates that the highest percent of Fe was in titania coating compared with alumina and zirconia, others metals such as C, Si, and N appear because they present in the composition of carbon steel. Ti was recorded as 4.9, 23.4 and 29.26 wt% for coating by titania, titania-alumina and titania-zirconia respectively. The corrosion test on specimens was performed. It showed that the potential–time measurement for uncoated and coated carbon steel which recorded (Eoc) value of -0.6 V for uncoated sample, whereas the (Eoc) value was -0.313 V, -0.568 V and -0.572 V for coating by Titania, Titania-Alumina and Titania-Zirconia materials respectively.polarization curve for titania coated carbon steel indicating the lower corrosion rate while the Titania-Zirconia coated C.S gave the highest corrosion rate of 2.511 mm/y followed by Titania-Alumina coating to give 2.187 mm/y compared with the rate of uncoated C.S sample which recorded 0.721 mm/y