Corrosion Inhibitory Studies of Novel Schiff Bases Derived from Hydralazine Hydrochloride on Mild Steel in Acidic Media
Corrosion Inhibitory Studies of Novel Schiff Bases Derived from Hydralazine Hydrochloride on Mild Steel in Acidic Media作者机构：Department of Chemistry Faculty of Science University of Buea Buea Cameroon Department of Inorganic Chemistry Faculty of Science University of Yaounde 1 Yaounde Cameroon Department of Pure and Applied Chemistry University of Calabar Calabar Nigeria
出 版 物：《Open Journal of Physical Chemistry》 (物理化学期刊（英文）)
年 卷 期：2018年第8卷第1期
页 面：15-32页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Mild Steel Hydralazine Hydrochloride Weight Loss Corrosion Inhibition
摘 要：The inhibition performance of 1-hydralazinophthalazine (HPZ) (1), and synthesized1-(2-[(5-methylfuran-2-yl)methylene)] hydrazono) phthalazine (MFHPZ) (2), 1-(phthalazin-1(2H)-one) [(pyridin-2-yl) ethylidene] hydrazone (ACPHPZ) (3) and (2-acetylthiophene hydrazono) phthalazine (ACTHPZ) (4) has been investigated for mild steel in 1 M HCl. Compound 4 shows maximum inhibition efficiency of 93% at 5.0 × 10-3 M concentration. The evaluation of thermodynamics and activation parameters indicated spontaneous adsorption of the inhibitor molecules which takes place through chemisorption. The adsorption of 3 and 2 follows Langmuir adsorption isotherm and Temkin adsorption isotherm for 4 and 1. The inhibitor efficiency was of the order 4 3 1 2. Impedance study for the representative inhibitor compounds 4 and 3 showed that decrease in charge transfer resistance is responsible for effective protection of mild steel surface by the tested inhibitor.
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