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تحضير وتشخيص مثبطات تاكل جديدة من اعادة تدوير بولي اثلين ترفثاليت وتقييم كفاءتها في تثبيط تاكل الصلب الكربوني في الوسط الحامضي == Preparation and Characterization of New Corrosion Inhibitors from Polyethylene Terphthalate (PET) and Study its efficientcy As to Inhibit the Corrosion of Carbon Steel in Acidic Media
Author name:
منتظر فريد الاسدي
Supervisor name:
مؤيد نعيم خلف
General topic:
Chemistry
Specific topic:
Chemistry
Degree:
Master
University:
University Of Basrah - College Of Science - Chemistry Department
Language:
Arabic
University location:
Basrah
First pages:
25T1611 - p.pdf
Abstract:
The research included synthesis ,characterization and evaluation of new corrosion inhibitors(bis(2 - hydroxy ethyl) thioterphthalte and bis(2 - hydroxyethyl)terephthalate from recycled waste polyethylene terephthalate . The best percent of the two corrosion inhibitors were reached after many experiments, which included study many factors like temperature, catalyst , the equivalent weight of reactants and others. The synthesized corrosion inhibitors were characterized by FTIR spectroscopy . The two inhibitors were evaluated as corrosion inhibitors using sulfuric acid as corrosion media for carbon steel( carbon steel C1010) . The factors effect on the rate of corrosion like temperature , concentration of inhibitor were studied by the electrochemical technique using the Tafel plot. The obtained results at temperatures range ( 298, 308,318,328 K) were used to calculate many factors that determined the efficiency of the inhibitor like corrosion rate , charge transfer resistance and inhibitor efficiency. it was observed that the corrosion rate and charge transfer of the carbon steel for the inhibitors increases with increase of temperature and decreases with increase of the inhibitor concentration in the same temperature. The Results showed that both inhibitors had very high inhibition in reducing the corrosion rate . The inhibition efficiency reached (96%) for the bis(2 - hydroxy ethyl) thioterphthalate for the 24ppm and (91%) for the bis (2 - hydroxy ethyl) terephthalate for the 25ppm .Many thermodynamics functions was calculated ,activation energy a ,entropy S , enthalpy and free energy G during the different experiment conditions ,which was indicated of the corrosion inhibition efficiency and the type of the inhibition. The obtained results showed that the two inhibitors were very efficient to reduce the corrosion rate in the acidic media and from the G data the type of adsorption was chemical because the value of Gads was higher than (20 KJ/mol) .
