Sargassum latifolium (Turner) C. Agardh, 1820 as corrosion inhibitor for mild steel in natural seawater

The corrosion impacts on the behavior of materials cause significant economic losses, particularly in seawater. Therefore, Sargassum latifolium (Turner) C. Agardh, 1820 was examined as a corrosion inhibitor by different weights of 0, 0.05, and 0.1 g for mild steel in natural seawater gathered from several sectors along the Mediterranean coast of Egypt. The weight loss technique was utilized to measure the rate of corrosion for steel. The total average corrosion rates were 3.902, 2.026, and 1.237 mils per year (mpy), respectively. Its addition of 0.1 g showed the best seawater corrosion inhibitor (98.33 %) giving a minimum corrosion rate of steel 0.046 mpy. The inhibitory property is owing to the existence of terpenoids, fatty acids, and quinones groups presented in the GC–MS. Their functional groups were confirmed through FT-IR analysis, including –OH, –NH, –CH, –COO–, CO, and C–C groups. The statistical analyses were applied to the corrosion inhibition efficiency of Sargassum . Sargassum demonstrated consistent inhibitory performance, thereby recommending its applicability for use in ships, pipelines, and other marine structures exposed to varying seawater conditions. Future research can explore the effects of additional environmental and physical factors to elucidate the mechanisms by which Sargassum inhibits corrosion.