الفهرس 
correlation betveen inhibitionOnly 14 pages are availabe for public view
 |  | from | 301 |  |  |
| | | from | 301 | | |
Abstract
A literature survey of the corrosion behaviour of copper and iron and of the different methods of preventing metallic corrosion was made. Inhibitors were classified according to their mechanism of action. Correlation between inhibition and stability of compounds and the effect of molecular structure of inhibitors were reviewed. Preperation of l-benzoyl-4-phenyl-3-thiosemicarbazide derivatives, para meothoxy (a), para methyl (b), ortho methyl (c), or tho hydroxy (d) ortho chloro (e), hydrogen (f), and para nitro (g); (first group) and (4--phenyl)-methylene-2-phenyl oxazolin-5-one derivatives, 2,4 dihydroxy (I), 4-hydroxy (II), 4-methyl (III), 4-chloro (IV), hydrogen (V) and 4-nitro (VI); (second group) used as inhibitors for the corrosion of copper and iron was described. Details of weight loss, galvanostatic polarization measurements and calculation of results were also indicated. The effect of inhibitors on the cathodic and anodic polarization of copper in nitric and iron in hydrochloric acid solutions was investigated. Corrosion rate decreased with increase of concentration in the presence of the additives together with an increase in both cathodic and anodic polarization, but the corrosion inhibition has a greater effect on cathodic polarization. Variation in inhibition efficiency with the structure of the compounds was interpreted in terms of the number of adsorption active centers in the molecule and their electron charge density, molecular size, mode of adsorption, heat of hydrogenation and formation of complex.