ملخص الدراسة:

Two Compounds of Gemini Surfactants Cationic were prepared the hydrophilic (4,4'- Sulfonyl bis (N-hexadecyl benzenaminium) di bromide H22) and (N,N- di hexadecyl-4-(4-(hexadecyl ammonio)phenyl sulfonyl) benzenaminium) di bromide H33) , these surfactants were characterized by (IR,1H.NMR,) and as corrosion inhibitor for Carbon-Steel in 0.5 M HCl solution, two methods were used for this study weight loss and galvanostatic polarization techniques. The result show that the inhibition efficiency of inhibitors increases with concentration to attain (80.60%,82.27%) of H33 and H22 at 1×〖10〗^(-4) M HCL, time 240 min and temperature 25°C.. Polarization curves revealed that the studied inhibitors represent a mixed – type inhibitors .