The effect of sulfurous water on the corrosion behavior of carbon steel with different carbon ratios.

The aim of this research is to study the effect of carbon percentage on corrosion rates. Four types of carbon steel with different carbon percentage (0.112% C, 0.196% C, 0.314% C, 0.394% C) were used in this study. The samples were submerged in a erosion medium composed of sulfur water for periods of (30,45, 60) days. The corrosion rate was calculated using a weight loss method. The results showed corrosion rates depend on carbon percentage in carbon steel, the highest corrosion rate was found in carbon steel which contains(0.394% C), while the lowest corrosion rate was found in carbon steel contain (0.112% C). Sulfur water has a major role in increasing the corrosion rates of carbon steel, because it contains a large percentage of chlorides, salts and sulfates in addition to the presence of hydrogen sulfide. The presence of the calcareous layer on the surface of samples resulting from calcium ions may contribute to reducing corrosion rates, as it works to prevent oxygen from reaching the metal surface. [ABSTRACT FROM AUTHOR]