Enhancement of the corrosion barrier properties of epoxy coatings through the incorporation of TiO2 and Sulfosalicylic acid doped poly(o-ethoxyaniline) applied onto 420SS in 3.5 wt.% NaCl solution with pH 4.5

IF 4.3 2区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Science Pub Date : 2025-10-18 DOI:10.1016/j.ces.2025.122789

Nacer Mounir, Aicha Ziouche, Malha Nazef, Hamid Yousfi

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引用次数: 0

Abstract

The present work focuses on the development of advanced epoxy coatings based on poly(o-ethoxyaniline) (POEA) doped with nano-TiO

_{2}

$_{2}$ and sulfosalicylic acid (SSA), designed to enhance the corrosion resistance of 420 stainless steel (420SS) compared with conventional zinc phosphate (ZP) coatings. The synthesized coatings were characterized by FTIR spectroscopy, contact angle (CA) measurements, and SEM observations. Their protective performance was further evaluated in a 3.5 wt.% NaCl solution at pH 4.5 using electrochemical techniques, including open-circuit potential (OCP), linear polarization resistance (LPR), potentiodynamic polarization (Tafel curves), electrochemical impedance spectroscopy (EIS), and long-term immersion tests. The POEA-SSA/TiO

_{2}

$_{2}$ epoxy system exhibited significantly higher corrosion resistance (5-fold), corrosion current density reduced by 50-fold, impedance increased by 100% than ZP, mainly due to the formation of a stronger passivation layer and the contribution of an auxiliary cathodic process between the emeraldine and leuco forms of POEA. Overall, the results highlight the potential of POEA-SSA/TiO

_{2}

$_{2}$ modified epoxy coatings as durable protective layers for 420SS, offering a practical alternative to conventional ZP for storage tanks operating in acidic salt environment.

Abstract Image

查看原文本刊更多论文

在3.5 wt.% NaCl和pH为4.5的溶液中加入TiO2和磺基水杨酸掺杂聚邻乙氧基苯胺，增强环氧涂料的耐蚀性能

本文主要研究了以聚邻乙氧基苯胺（POEA）为基材，掺杂纳米tio22和磺基水杨酸（SSA）的高级环氧涂料的开发，旨在提高420不锈钢（420SS）的耐腐蚀性，而不是传统的磷酸锌（ZP）涂层。通过FTIR光谱、接触角（CA）测量和SEM观察对合成的涂层进行了表征。在pH为4.5的3.5 wt.% NaCl溶液中，使用电化学技术进一步评估其保护性能，包括开路电位（OCP）、线性极化电阻（LPR）、动电位极化（Tafel曲线）、电化学阻抗谱（EIS）和长期浸泡测试。与ZP相比，POEA- ssa /TiO22环氧体系的耐蚀性提高了5倍，腐蚀电流密度降低了50倍，阻抗提高了100%，这主要是由于POEA形成了更强的钝化层，并且在POEA的翡翠态和白色形态之间形成了辅助阴极过程。总的来说，研究结果突出了POEA-SSA/TiO22改性环氧涂料作为420SS耐用保护层的潜力，为在酸性盐环境下运行的储罐提供了传统ZP的实用替代品。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Engineering Science 工程技术-工程：化工

CiteScore

7.50

自引率

8.50%

发文量

1025

审稿时长

50 days

期刊介绍： Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.