Abstract
Polyethylene terephthalate waste (PET) was depolymerized by thiodiglycol into thioglycolyzed product. The product was characterized by FTIR and 1HNMR spectroscopy and the thermal properties (TGA, DTA) showed that the prepared compound was thermally stable until 250°C. The efficiency of the prepared corrosion inhibitor for carbon steel was measured by using acid media (0.1 HCl) as corrosive environment and the inhibitor concentration was (0, 10, 20, 30, 40 and 50 ppm). The electrochemical technique used Tafel plot to measure the efficiency of inhibitor. Factors effect on the rate of corrosion like temperature (298, 308, 318, 328 K) and concentration (10, 20, 30, 40, 50 ppm) of inhibitor were studied. From the obtained results many factors were calculated 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 inhibitor increase with increase of temperature and decrease with increase of the inhibitor concentration in the same temperature. The results showed that the inhibitor had high inhibition in reducing the corrosion rate. The inhibition efficiency (% IE) reached 97.1% for the 40 ppm concentration at 308 K.
Highlights
Polyethylene terephthalate waste (PET) introduced to consumers as the plastic soft drink bottle in the 1970s, PET quickly gained acceptance among bottlers and consumers [1] [2] [3]
The efficiency of the prepared corrosion inhibitor for carbon steel was measured by using acid media (0.1 HCl) as corrosive environment and the inhibitor concentration was (0, 10, 20, 30, 40 and 50 ppm)
It was observed that the corrosion rate and charge transfer of the carbon steel for the inhibitor increase with increase of temperature and decrease with increase of the inhibitor concentration in the same temperature
Summary
PET introduced to consumers as the plastic soft drink bottle in the 1970s, PET quickly gained acceptance among bottlers and consumers [1] [2] [3]. Recycling of PET has become an important process from the environmental point of view and it has given commercial opportunity due to wide spread use and availability of PET bottles, packages and fibers [4] [5] [6] [7]. Corrosion is a chemical or electrochemical oxidation process, in which the metal transfer electrons to the environment and undergoes a valance change from zero to a positive value. In the present study waste PET-bottles were depolarized using ethylene glycol to produce (Bis(2-((2-hydroxyethyl)thio) ethyl) terephthalate, the produce compound was tested as corrosion inhibitor
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