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Study of the Fundamental Corrosion of Ferrous Metals in Crude Oils
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Studienarbeit aus dem Jahr 2018 im Fachbereich Ingenieurwissenschaften - Metallbautechnik und Metallverarbeitung, Sprache: Deutsch, Abstract: Corrosion is a crowing term regarding the ferrous metals which accomplishes premonitory issues on such metals with backing of the conditions of surrounding environment. According to the consistency ofcrude oils it tends to bear a hand of metallic corrosion foremost the effect of sulfur compounds, salts and organic acids that presence in crude oils. The investigation of the corrosion rates of seven different types of ferrous metals referring to both Murban and Das Blend crude oils and some essential episodes regarding the corrosion were the leading intention of the research. The sulfur contents, salt contents, mercaptans contents and acidities of both crude oils were determined by in succeed of XRF analyzer, salt analyzer and titration methods while testing the chemical composition of each metal by XRF detector. A batch of equal sized metal coupons was prepared from each type of metal and dipped entirely in both crude oils separately. The rate of corrosion in each metal coupon was determined by the weight loss method after 15, 30 and 45 days from the immersion while observing the corroded surface of each coupon by an optical microscope. The ferrous concentrations and copper concentrations in crude oil samples weretested by the AAS after the interactions with metals and the hardness of each metal coupon was tested before the immersion in crude oil and after corroded. There were found relatively lower corrosion rates from stainless steels than other the metals while finding some higher metallic concentrations in crude oils regarding carbon steels, slight reduction of the hardness after the corrosion and finally it can be concluded the formation of FeS, corrosion cracks and pitting corrosion in most of occasions with the microscopic observations regarding the appearances of such a compound. Keywords: Ferrous metals, Crude oils, Corrosion rate, Corrosion compounds, Hardness
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