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Humanitarian and Natural Sciences Journal, 2022
Calcium and magnesium salts content controls the hardness of a water supply. These salts could fo... more Calcium and magnesium salts content controls the hardness of a water supply. These salts could form a combination with bicarbonates, sulfates, chlorides, and nitrates and precipitate as a solid which makes water more aggressive, destructive, and corrosive environment. In this paper; an experimental study was conducted in an attempt to determine a quantitative relationship between the hardness of heated water that responsible for alkaline and sulfur scales formation on metal surfaces and the corrosion penetration rate of carbon steel. Square (48) metal samples were cut from carbon steel sheets of known metallurgical composition manufactured by Libyan Iron and Steel Company in Misurata and supplied from General Pipe Company in Benghazi. The samples were prepared, measured and sorted into four groups and each of which separated in three samples. Each group of samples were immersed in a particular type of heated water at 100°C for different successive durations of immersion time. It was followed by an assigned exposure time (40 days) to the same water type. Four different aerated water sources and types were selected in this study to examine their associated hardness effect on mild steel corrosion penetration rate. The chemical analysis of the water types were carried out in Hawari GMRA headquarter laboratory in Benghazi. Distilled water diluted with seawater (1/2) had the highest total hardness (TH) of (8407.56 as ppm calcium carbonate), whereas the water of Great Man Made River (GMMR); Ajdabiya had the lowest TH of (208 ppm as CaCO3). The corrosion rate was measured based on the metal weight loss due to the immersion and exposure procedures and calculated as a corrosion penetration rate expressed in mils per year (mpy). The results displayed that an increase in the corrosion rate could be observed along with the total water hardness reduction for the three types of diluted seawater; in contrast, the lowest corrosion rate value was perceived in samples that immersed in (GMMR) water. It was also found that the immersion for more than 30 minutes in heated diluted seawater with TH of (4203.7 and 8407.5 mg/L) results in a decrease in the corrosion rate.
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](Journal of Molecular Graphics and Modelling
Humanitarian and Natural Sciences Journal, 2022
Calcium and magnesium salts content controls the hardness of a water supply. These salts could fo... more Calcium and magnesium salts content controls the hardness of a water supply. These salts could form a combination with bicarbonates, sulfates, chlorides, and nitrates and precipitate as a solid which makes water more aggressive, destructive, and corrosive environment. In this paper; an experimental study was conducted in an attempt to determine a quantitative relationship between the hardness of heated water that responsible for alkaline and sulfur scales formation on metal surfaces and the corrosion penetration rate of carbon steel. Square (48) metal samples were cut from carbon steel sheets of known metallurgical composition manufactured by Libyan Iron and Steel Company in Misurata and supplied from General Pipe Company in Benghazi. The samples were prepared, measured and sorted into four groups and each of which separated in three samples. Each group of samples were immersed in a particular type of heated water at 100°C for different successive durations of immersion time. It was followed by an assigned exposure time (40 days) to the same water type. Four different aerated water sources and types were selected in this study to examine their associated hardness effect on mild steel corrosion penetration rate. The chemical analysis of the water types were carried out in Hawari GMRA headquarter laboratory in Benghazi. Distilled water diluted with seawater (1/2) had the highest total hardness (TH) of (8407.56 as ppm calcium carbonate), whereas the water of Great Man Made River (GMMR); Ajdabiya had the lowest TH of (208 ppm as CaCO3). The corrosion rate was measured based on the metal weight loss due to the immersion and exposure procedures and calculated as a corrosion penetration rate expressed in mils per year (mpy). The results displayed that an increase in the corrosion rate could be observed along with the total water hardness reduction for the three types of diluted seawater; in contrast, the lowest corrosion rate value was perceived in samples that immersed in (GMMR) water. It was also found that the immersion for more than 30 minutes in heated diluted seawater with TH of (4203.7 and 8407.5 mg/L) results in a decrease in the corrosion rate.
Journal of Molecular Graphics and Modelling