Study of two organic compounds containing nitro functional group as temporary protection of steel corrosion

Subject Areas :

فریبرز اتابکی ¹ ( استادیار دانشکده شیمی کاربردی، دانشگاه صنعتی مالک اشتر، اصفهان، ایران )
مهران رادور ² ( کارشناس ارشد دانشکده شیمی کاربردی، دانشگاه صنعتی مالک اشتر، اصفهان، ایران )

Received: 2018-04-30 Accepted : 2018-11-01 Published : 2018-11-22

Keywords: Mild Steel, Corrosion Inhibitor, Atmospheric corrosion, Temporary protective coating,

Abstract :

Steel parts can be protected against atmospheric corrosion by temporary protective coatings. The inhibitors in temporary protective coating by virtue of adsorption on the metal surface blocking the active sites and thereupon decrease the corrosion rate. In this research, two compounds N-)3-nitrophenyl( maleamic acid )NPMA( and N-)2,4-dinitrophenyl( maleamic acid )DNPMA( were synthesized and were added to temporary protective oil coating. These compounds were characterized by FT-IR. Yield of )NPMA( and )DNPMA( were obtained as 80% and 84% yield, respectively. In next stage, 300-3600 ppm of synthesized corrosion inhibitors were added to base oil and used for covering on the surfaces of mild steel samples as temporary protective coatings. The covered steel samples located in chamber constructed according to ASTM D-1748 with 100% relative humidity and their corrosion inhibition determined by optical microscope and weight loss measurements. The results showed that prepared coatings were very efficient. The inhibition efficiency increases with increasing inhibitor concentrations to 900 ppm, and DNPMA is better than NPMA.

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