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Abstract Seven phosphonium salt compounds were synthesized as model substances in order to study the effect of molecular structure on inhibition efficiency. The inhibition of these compounds on corrosion of carbon steel in 1N HCl solution has been investigated by using the weight loss, potentiodynamic and double layer capacitance determination techniques. The experimental results show that the seven phosphonium salts all inhibit both the anodic and the cathodic processes of carbon steel in 1N HCl solution. The inhibition effect of bis-phosphonium salts was stronger than that of monophosphonium salts. The adsorption of benzyltriphenyl phosphonium bromide and 1, 4-di (triphenyl phosphonium bromide) butylane on carbon steel surface in 1N HCl at 25℃ followed Bockris-Swinkels isotherm. The adsorption free energies of phosphonium salts on carbon steel decreased with increasing temperature at 15～35℃ and increased with increasing temperature at 35～50℃. Therefore, two different entropy changes of adsorption and heats of adsorption were obtained. In addition, two apparent activation energies were calculated at different temperature ranges.
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Received: 25 June 1988
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