New protective transparent polymeric coatings were used in this study based on the presence of 3-(Trimethoxysilyl)propyl methacrylate (TMSPMA); Vinyl chloride vinyl acetate copolymer (VCVACO); Ormocer; Nitrosal (Hydroxy ethyl cellulose HEC) as polymers, to protect copper and iron alloys from corrosion. The protection efficiency of these polymeric coatings on copper and iron alloys, was measured by electrochemical impedance spectroscopy (EIS) technique. The electrochemical results were confirmed by scanning electron microscopy (SEM) technique. The results showed that vinyl chloride-vinyl acetate copolymer and trimethoxysilyl-propyl methacrylate can be used as protective coatings for copper alloys due to their high protection efficiency 98 and 92 %, respectively. While, ormocer polymeric coating showed mild protection efficiency for copper alloys, with protection efficieny 57.7 %. Vinyl chloride vinyl aetate copolymer showed the highest protection efficiency for iron alloys, 91.6 %. While, 3-(trimethoxysilyl)propyl methacrylate showed only 75.9 % protection efficiency. On the other hand, nitrosal did not show any protection behavior against corrosion for both copper and iron alloys.