Synthesis of Nitro derivatives phenyl hydrazinocarbonyl acrylic acid and their use as corrosion inhibitor agent in temporary coatings

Carbon and low-alloy steels are the major construction materials extensively used in water distribution, petroleum, power production, as well as chemical and electrochemical industries. The use of organic molecules as corrosion inhibitors is one of the most popular, efficient, and practical methods applied extensively to protect metals against corrosion damage. In present study, N-phenyl hydrazinocarbonyl acrylic acid (N-PHAA), N-2,4-Dinitro phenyl hydrazinocarbonyl acrylic acid were synthesized from reaction of Phenyl hydrazine with maleic anhydride (MA) in DMF and reaction of 2,4-Dinitro phenyl hydrazine with maleic anhydride (MA) in acetone at room temperature. All compounds were characterized by FT-IR. Yield and temperature of thermal decomposition of products of (NPHAA) and (NDNPHAA) were obtained as 73%, 214-216 ̊C and 89%, 131-133 ̊C, respectively. Then, synthesized compounds used as the corrosion inhibitor. For next stage, 10-150 ppm of synthesized corrosion inhibitor were added to base oil and used for covering on the surfaces of low carbon steel samples as temporary protective coatings, the covered steel samples located in chamber with 100% relative humidity and at 38 ̊C their protection determined according to ASTM D-2247. Synthesized inhibitor compounds showed the best resistance against corrosion in 75 ppm and (NDNPHAA) showed the best results.