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Abstract The corrosion-inhibiting abilities of a series of ringsubstituted benzonitriles were investigated. As in the case of benzene-acetonitriles, chemisorption is probably the mechanism of the corrosion-inhibiting effects.Introducing electtondonating groups in the para-position increases the corrosion-inhibiting ability, while introducing of electron-withdrown groups in the para-position decreases the corrosion inhibiting ability, when a substituent is positioned in o, m or P positions,both elec tronic and steric effects of the substituent affect the corrosioninhibiting ability. Besides, synergistic effect was observed when P-chlorobenzonitrile was used together with anionic or cationic dispersion agents.
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Received: 25 June 1987
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