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2‐Aminothiazole derivatives as Adsorption Inhibitors for corrosion of commercial copper and brass in acid solutions
Author(s) -
Rehan H. H.
Publication year - 1993
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19930240810
Subject(s) - chemistry , adsorption , chemisorption , copper , metal , corrosion , inorganic chemistry , brass , molecule , protonation , organic chemistry , ion
Corrosion inhibition of commercial copper and cold‐worked and annealed α‐brass (Cu/Zn : 69/31) in acid chloride solutions by some 2‐aminothiazole derivatives was studied by weight loss, polarization and capacitance measurements. The study includes the effect of substituent type at position 4, the inhibitor concentration and pH on the efficiency of inhibition. The results showed that the inhibition occured via chemisorption of the inhibitor molecules on the corroding metal following Temkin's isotherm and the adsorption process involved the electron donation from the inhibitor to the metal surface. Quantitatively the inhibition efficiency was found to run parallel to the electron density on the thiazole molecule according to Hammett's relation and the sensitivity of the process is independent of the corroding metal. The inhibition efficiency was found to decrease significantly as the solution pH deceases due to the protonation of the inhibiting molecules.