An investigation of some Schiff bases as corrosion inhibitors for austenitic chromium-nickel steel in H2SO4
JOURNAL OF APPLIED ELECTROCHEMISTRY, vol.31, no.1, pp.79-83, 2001 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 31 Issue: 1
- Publication Date: 2001
- Doi Number: 10.1023/a:1004182329826
- Journal Name: JOURNAL OF APPLIED ELECTROCHEMISTRY
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.79-83
- Keywords: corrosion, inhibitor, Schiff bases, steel, MILD-STEEL, SULFURIC-ACID, CARBON-STEEL, ADSORPTION, IRON, NACL
- Ankara University Affiliated: No
Abstract
The corrosion inhibition of austenitic chromium-nickel steel by two Schiff bases, N-(1-toluidine)salicylaldimine and N-(2-hydroxyphenyl)salicylaldimine, was investigated in sulphuric acid medium. The effect of concentration and temperature on inhibition properties was determined. It was found that when the concentrations of inhibitor were increased the inhibition efficiencies (eta) and surface coverage (theta) increased. Some thermodynamic parameters such as free energy of adsorption, DeltaG(ads)degrees, and enthalpy, DeltaH, were determined for the Schiff bases. Experimental results agree with the Temkin isotherm for N-(1-toluidine)salicylaldimine, but the Langmuir isotherm is more appropriate for N-(2-hydroxyphenyl)salicylaldimine.