Abstract

N,N'-bis (salicylaldehyde)-1,3-diaminopropane (Salpn) has been evaluated as corrosion inhibition for iron in 0.1 M HCl when the films of Salpn were self-assembled on the surface of iron to improve anticorrosion property of the substrate. Monolayer formation takes place when carbon steel is precoated in hot ethanolic/aqueous 1 mM Salpn solution for 10, 20 and 30 min, and rinsing the physisorbed molecules in distilled water and heating in a hot air oven. The films of Salpn inhibitor were characterized by weight loss method and electrochemical impedance spectroscopy, electrochemical polarization curves. Results revealed that Salpn performed excellently as a corrosion protection for iron in HCl solution. The formations of monolayers were confirmed by SEM study and ATR-FTIR spectra. Taken together, the outcomes of present study exhibited that precoating of Salpn on the substrate surface is able to provide protection efficiency up to 95% and escalating of the soaking time in corrosive environment up to 24 h only reduces slightly protection efficiency (around 6%) implying this layer act as effective corrosion inhibitors.

中文翻译：

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席夫碱分子在碳钢表面形成的自组装膜的缓蚀性能

摘要

ñ，ñ'-双（水杨醛）-1,3-二氨基丙烷（Salpn）已被评估为当 Salpn 膜在铁表面自组装以提高基材的防腐性能时，在 0.1 M HCl 中对铁的腐蚀抑制作用。当碳钢在热乙醇/1 mM Salpn 溶液中预涂 10、20 和 30 分钟，然后在蒸馏水中冲洗物理吸附的分子并在热风炉中加热时，就会形成单层。采用失重法、电化学阻抗谱、电化学极化曲线对Salpn抑制剂薄膜进行表征。结果表明，Salpn 在 HCl 溶液中作为铁的腐蚀保护表现出色。通过SEM研究和ATR-FTIR光谱证实了单层的形成。综合起来，