INHIBITORY-ACTION OF 3-TRIMETHOXYSILYLPROPANETHIOL-1 ON COPPER CORROSION IN NACL SOLUTIONS

The inhibitory action of 3(trimethoxysilyl)propanethiol-1 (TMSPT) on c opper corrosion in NaCl 3.5% solutions at pH 6.5, at 25 degrees C and with an initial oxygen content of 6.5 ppm was examined. Different amou nts of TMSPT (0.5 x 10(-3), 1.1 x 10(-3), 2.0 x 10(-3), 2.7 x 10(-3)) M were added to NaCl solutions. Weight loss and electrochemical tests show that the inhibitory action of TMSPT increases with increasing TMS PT concentration, and decreases with increasing the exposure time. TMS PT acts as an anodic inhibitor (by forming an adsorption film on coppe r surfaces) as well as a cathodic inhibitor (by reducing dissolved oxy gen content in corrosive solutions). (C) 1997 Elsevier Science Ltd.