Ultrathin protective films prepared by modification of an N,N-dimethylalkylamine monolayer with chlorosilanes for preventing corrosion of iron

Alkylamines are strongly chemisorbed on iron and hence, effective inhibitors for iron corrosion in acid solutions. In this study, the protective abilities of N,N-dimethylalkylamine monolayers and their modified films with alkylchlorosilanes against iron corrosion in aerated 0.5 M NaCl were examined by polarization and impedance measurements. The films prepared on the iron surface were characterized by FTIR reflection and X-ray photoelectron spectroscopies and contact angle measurement. The protective efficiency of an 11-N,N-dimethyl-1-undecanol monolayer modified with 1,2-bis(trichlorosily)ethane and octadecyltrichlorosilane was not remarkably high, 93.1%.