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Abstract The corrosion inhibition of carbon steel by benzyltripenyl phosphonium bromide (BPB) and 1,4-di(triphenyl phosphonium bromide) butylane (DPBB)in 0.5MH_3PO_4 solution Containing CNS-,I~- was investigated by gravimetric, potentiodynamic and impedance determination techniques. The experimental results show that the synergistic effect of corrosio inhibition appears between above-mentioned anions and phosphonium salts. The synergistic effect was closely relevant to the concentratio ratio of anion to phosphonium salt. The adsorption of BPB or DPBB on carbon steel follows Bockris-Swinkels isotherm in 0.5MH_3PO_4 solution without anion at 25℃. But adding anions into 0.5M H_3PO_4 solution containing BPB or DPBB, the interaction among adsorbed species became significant. Thus, a free energy parameter f was introduced into the Bockris-Swinkels isotherm as follows θ/(1-θ)~n·[θ+n(1-θ]~(n-1)/n~1·exp (-fθ)=C/55.5exp(-△G_a~0/RT)
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Received: 25 June 1989
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