The demand for corrosion inhibitors with low toxicity has increased in the last years in a wide range of sectors. Our study presents investigation of ethylethanolammonium 4-nitrobenzoate (EEA4NB) organic salt as corrosion inhibitor. The analysis of crystal structure revealed the formation of organic salt with proton transfer from 4-nitrobenzoic acid on nitrogen atom of aminoalcohol molecule. The cationic component forms 1D supramolecular chain along b axis due to N–H···O hydrogen bonds. The chain is decorated by 4-nitrobenzoate anions due to O–H…O and charge assisted N–H…O H-bonds, which form R22(9) graph set (Figure 1). Thermal stability and calorimetric studies were performed in nitrogen atmosphere using the TG and DSC techniques (Figure 2). Electrochemical corrosion measurement technique was used to evaluate the efficiency of EEA4NB in corrosion inhibition of iron in 3% NaCl solution (Figure 3). The study was conducted at various concentrations (1, 2.5 and 5 mM) at 25°C. The corrosion current and corrosion rate decreases with the increase of EEA4NB concentration. The inhibitive action results from the adsorption of EEA4NB molecules at the metal/solution interface which replace the water molecules present at interface and form at the surface stable complexes. Figure 1. Fragment of chain formation by N–H···O hydrogen bonds Figure 2. Thermogravimetric curves (TG, DTG, heat flow) of EEA4NB at heating rates of 10 ºC min-1, in nitrogen atmosphere Figure 3. Polarization Tafel curves for iron in 3 % NaCl in the absence and presence of EEA4NB (5mM) at a sweep rate of 1 mV s-1 at 25 ºC