A Comparison of Localized Corrosion Behavior of Hastelloy X and Stainless Steel 316 in Persian Gulf Costal Water

IF 1.1 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

Protection of Metals and Physical Chemistry of Surfaces Pub Date : 2024-12-03 DOI:10.1134/S2070205124701752

M. Jalali, P. Najafisayar

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Abstract

Localized corrosion behaviors of Hastelloy X and stainless steel 316 in Persian Gulf coastal water were compared fundamentally using cyclic potentiodynamic polarization (CPC), electrochemical impedance spectroscopy (EIS), Mott–Schottky analysis. X-ray diffraction spectroscopy and scanning electron microscopy techniques. The results showed that passive films that are formed on Hastelloy X and stainless steel 316 are mainly include nickel and chromium oxides that exhibit p-type semiconducting behavior. The films that are formed on the surface of former include less crystal defects than those on the latter one surface. In both cases, films with more crystal defects will form when their respective formation temperature increases. Such passive films’ characteristics lead to find Hastelloy X to be more resistant to localized corrosion than stainless steel 316 in Persian Gulf water as was proved by the CPC and EIS test results; i.e. as the temperature increases from 25 to 75°C, pitting corrosion resistance (R_pit) and film resistance (R_film) values decreased in the case of Hastelloy X and stainless steel 316 samples while the former is more resistant to corrosion than the latter.

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哈氏合金X和316不锈钢在波斯湾海水中局部腐蚀行为的比较

采用循环动电位极化（CPC）、电化学阻抗谱（EIS）、Mott-Schottky分析等方法，对哈氏合金X和316不锈钢在波斯湾沿岸水体中的局部腐蚀行为进行了基本比较。x射线衍射光谱学和扫描电子显微镜技术。结果表明：在哈氏合金X和316不锈钢表面形成的钝化膜主要是镍和铬氧化物，表现出p型半导体行为；在前者表面形成的薄膜比后者表面形成的薄膜包含较少的晶体缺陷。在这两种情况下，当它们各自的形成温度升高时，形成的薄膜具有更多的晶体缺陷。CPC和EIS测试结果证明，由于这种钝化膜的特性，在波斯湾海水中，Hastelloy X比不锈钢316更耐局部腐蚀；即当温度从25℃升高到75℃时，哈氏合金X和不锈钢316样品的抗点蚀性（Rpit）和抗膜性（Rfilm）值降低，而前者比后者更耐腐蚀。

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来源期刊

Protection of Metals and Physical Chemistry of Surfaces 工程技术-冶金工程

CiteScore

1.90

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： Protection of Metals and Physical Chemistry of Surfaces is an international peer reviewed journal that publishes articles covering all aspects of the physical chemistry of materials and interfaces in various environments. The journal covers all related problems of modern physical chemistry and materials science, including: physicochemical processes at interfaces; adsorption phenomena; complexing from molecular and supramolecular structures at the interfaces to new substances, materials and coatings; nanoscale and nanostructured materials and coatings, composed and dispersed materials; physicochemical problems of corrosion, degradation and protection; investigation methods for surface and interface systems, processes, structures, materials and coatings. No principe restrictions exist related systems, types of processes, methods of control and study. The journal welcomes conceptual, theoretical, experimental, methodological, instrumental, environmental, and all other possible studies.