脂肪咪唑类化合物作为青铜在酸雨中的绿色缓蚀剂

IF 2.9 3区 材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Coatings Pub Date : 2024-09-07 DOI:10.3390/coatings14091152
Ian Didiere Vázquez-Aguirre, Alvaro Torres-Islas, Edna Vázquez-Vélez, Horacio Martínez, Adrián del Pozo-Mares, Ave María Cotero-Villegas
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引用次数: 0

摘要

酸雨是青铜暴露在大气中的主要腐蚀剂之一。青铜表面会自然形成一层称为铜锈的氧化物,保护青铜免受腐蚀。然而,当暴露在酸雨中时,这层氧化物就会溶解,因此有必要使用缓蚀剂或稳定铜绿。本研究调查了在模拟酸雨(pH 值为 4.16 ± 0.1)中作为 SAE-62 青铜缓蚀剂的从农用工业废糠中提取的脂肪咪唑啉。电化学阻抗光谱(EIS)和电位极化曲线(PC)测量用于评估缓蚀效率,当缓蚀剂浓度为 50 ppm 时,缓蚀效率为 90%。EIS 测量结果表明,脂肪咪唑类化合物形成了一层保护膜,通过阻碍电荷转移过程在一定程度上稳定了青铜表面的铜绿。SEM-EDS 分析了保护氧化层的形态和组成。拉曼光谱和 XRD 分析对结果进行了补充,表明在青铜表面形成的铜绿层中含有铜绿石、钛铁矿、锡石和钴铁矿。扫描电镜分析表明,使用 50ppm 浓度的抑制剂时,青铜表面的保护层是均匀的。XRD 分析表明,存在一种有机复合物,可稳定青铜表面形成的腐蚀产物。
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Fatty Imidazolines as a Green Corrosion Inhibitor of Bronze Exposed to Acid Rain
Acid rain is one of the primary corrosive agents on bronze exposed to the atmosphere. Bronze naturally forms a layer of oxides on its surface called patina, protecting it from corrosion. However, when exposed to acid rain, this layer dissolves, making it necessary to use a corrosion inhibitor or stabilize the patina. This study investigated fatty imidazolines derived from agro-industrial waste bran as a corrosion inhibitor of SAE-62 bronze in simulated acid rain (pH of 4.16 ± 0.1). Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curve (PC) measurements were used to evaluate corrosion inhibition efficiency, which was 90% for an inhibitor concentration of 50 ppm. The EIS measurements showed that the fatty imidazolines formed a protective film that stabilized the patina on the bronze surface to a certain extent by hindering the charge transfer process. SEM–EDS analyzed the morphology and composition of the protective oxide layer. The results were complemented by Raman spectroscopy and XRD analysis, indicating cuprite, tenorite, cassiterite, and covellite in the patina layer formed on the bronze surface. The SEM analysis showed that the protective coating on the bronze surface was homogeneous using a 50-ppm inhibitor concentration. The XRD analysis suggested the presence of an organic complex that stabilizes the corrosion products formed on the bronze surface.
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来源期刊
Coatings
Coatings Materials Science-Surfaces, Coatings and Films
CiteScore
5.00
自引率
11.80%
发文量
1657
审稿时长
1.4 months
期刊介绍: Coatings is an international, peer-reviewed open access journal of coatings and surface engineering. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided. There are, in addition, unique features of this journal: * manuscripts regarding research proposals and research ideas will be particularly welcomed * electronic files or software regarding the full details of the calculation and experimental procedure - if unable to be published in a normal way - can be deposited as supplementary material
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