Abstract
Five formulations of protective coatings were fabricated by treating bisphenol based epoxy resin A (BBERA) with different stoichiometry variations of polyaminoamine 115-Cray valley (PAA-115) as a hardener at ambient temperature. The fabricated epoxy coatings were first applied on glass plates for studying their mechanical properties. Other portions of the coatings were applied on steel substrates for reporting the corrosion behavior in an aerated 0.6 M NaCl solution. The chemical composition of the fabricated formulations was characterized using Fourier-transform infrared spectroscopy (FT-IR). A differential scanning calorimetry was used to report the thermal degradation of the fabricated coatings. The mechanical properties for the different coatings were evaluated using various techniques such as cross hatch tester, pendulum hardness, mandrel bend, and scratch tester measurements. The corrosion behavior for all coated steels after 60 min and 7.0 days immersion in 0.6 M NaCl solutions was performed using electrochemical impedance spectroscopy (EIS) investigations. It has been found that the five fabricated coatings provide high thermal stability, excellent mechanical properties and good corrosion behavior and their corrosion resistance decreased with increasing the exposure time from 60 min to 7.0 days before measurement.