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Effect of Oleuropein as Green Inhibitor on Corrosion Protection of Painted Steel

Pourghazian Esfahani, Alireza | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 52574 (57)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Ghorbani, Mohammad
  7. Abstract:
  8. The corrosion rate of steel (EN 10130 DC-04) in the presence of oleuropein in aqueous corrosive solutions (of different concentrations in 1M and 0.5M hydrochloric acid and also 3.5% sodium chloride) evaluated and results was shown that oleuropein can protect steel surfaces and it acts as good inhibitor. This means that the observations of linear polarization and weight loss experiments showed inhibitor efficiency more than 97% in acidic corrosive medium and above 74% for aqueous solution of 3.5% sodium chloride. Adding oleuropein at different concentrations (i.e. 300 ppm, 700 ppm, and 1000 ppm) to three different types of polymeric paint structures (nitrocellulose alkyd base, acrylic base, and poly-urethane base) for corrosion protection of painted steel was studied and found that, it can protect steel samples as a good green corrosion inhibitor but between them polyurethane base paint showed much better results. Based on immersion tests, adding 1000 ppm of the inhibitor to the painted steel film has improved the efficiency up to 58% and also observations on salt spray results showed, that the addition of 700 ppm inhibitor to the painted steel film has improved the efficiency up to 50%. Lastly, it was concluded that, polyurethane base paint is suitable for this purpose. Explaining that, depending on the structure of the polymers selected as the base paints, i.e. polyurethane, acrylic, and nitrocellulose coatings, the best coating is polyurethane base paint
  9. Keywords:
  10. Green Corrosion Inhibitor ; Colouring ; Steel Corrosion ; Polyurethane ; Corrosion Inhibitors ; Corrosion Protection

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