Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9783074 | Materials Chemistry and Physics | 2005 | 7 Pages |
Abstract
o-Methyl-p-methoxyphenyldithiophosphonic acid (MTPA), o-ethyl-p-methoxyphenyl-dithiophosphonic acid (ETPA) and o-isopropyl-p-methoxy phenyl dithiophosphonic acid (IPTPA) ammonium salts were used as inhibitors on steel corrosion in 1Â M HCl medium. Concentration of the inhibitors were in the used-as inhibitors on steel corrosion in 1Â M HCl medium. Concentrations of the inhibitors were in the range 10â3 to 2Â ÃÂ 10â2Â M, five different temperatures between 298 and 338Â K were tried; Tafel extrapolation and linear polarisation techniques were employed. Corrosion parameters and adsorption isotherms were determined from current-potential curves. At room temperature, the three compounds were found to decrease the corrosion rate by around 80% at 1Â ÃÂ 10â3Â M, and 95% at 2Â ÃÂ 10â2Â M concentration. The inhibition efficiencies weaken slightly at higher concentrations but in any case, more than 75% inhibition is observed at a temperature of 338Â K with an inhibitor concentration of 2Â ÃÂ 10â2Â M. Surface coverage degrees indicate that the adsorption pattern is consistent with the Temkin isotherm.
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Materials Science
Electronic, Optical and Magnetic Materials
Authors
M. KarakuÅ, M. Åahin, S. Bilgiç,