• Dr. A.R. Sontake
• Pushp Raj
• Raj Kumar
• Lokesh Deo Upadhyay
• Naveen Mahla, Ayush Chaware

that can bond with metal surfaces. These coordination sites, including hydroxyl and amino groups, act like "sticky spots" that allow the ER to create a strong, durable layer on the metal, protecting it from corrosion. In this study, two ER-based formulations were developed and applied to mild steel: one with the anticorrosive pigment zinc phosphate (ZP), known as ER-MDA-ZP, and a standard formulation without pigment, ER-MDA. The ER was combined with the hardener 4,4'-methylene di-aniline (MDA), forming a cross-linked polymeric network that uses its coordination sites to adhere firmly to the metal. Zinc phosphate in the ER- MDA-ZP formulation enhances this bonding and improves corrosion resistance. The structure of the epoxy resin was characterized by Nuclear Magnetic Resonance (¹H and ³¹P NMR) and Fourier Transform Infrared Spectroscopy (FTIR). Differential Scanning Calorimetry (DSC) analysis showed a higher glass transition temperature (Tg) in ER-MDA-ZP than in ER-MDA, indicating improved thermal stability. Electrochemical Impedance Spectroscopy (EIS) assessed the corrosion resistance of mild steel samples coated with each formulation in a NaCl solution. Total resistance (Rt) values were around 21,393 Ω cm² for ER-MDA and 55,193 Ω cm² for ERMDA-ZP, confirming the superior anticorrosive performance of the ZP-enhanced coating. After acid treatment, the samples were exposed to 2000 hours of UV radiation to simulate aging. The results demonstrate that the ER-MDA-ZP formulation offers enhanced thermal and anticorrosive properties, making it a promising choice for metal protective coatings. NMR (Nuclear Magnetic Resonance) and FTIR (Fourier Transform Infrared Spectroscopy) were used to analyze the molecular structure and functional groups in the resin. DSC (Differential Scanning Calorimetry) provided insight into the thermal stability of each formulation by measuring glass transition temperatures. EIS (Electrochemical Impedance Spectroscopy) measured the corrosion resistance of the coatings by analyzing how well they prevented ionic movement in a salt solution, indicated by total resistance (Rt) values.

Epoxy coatings, Zinc phosphate, EIS, NMR.

"A Comparative Study on Phosphorus-Based Epoxy Resin Coating For Internal Corrosion Resistance In Fire Extinguishers", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 11, page no.g61-g64, November-2024, Available :http://www.jetir.org/papers/JETIR2411606.pdf

"A Comparative Study on Phosphorus-Based Epoxy Resin Coating For Internal Corrosion Resistance In Fire Extinguishers", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 11, page no. ppg61-g64, November-2024, Available at : http://www.jetir.org/papers/JETIR2411606.pdf