Corrosion Behavior of 20G Steel in Saline (Na2SO4) Circumstances at High Temperature/Pressure

IF 1.5 4区材料科学 Q3 ENGINEERING, MECHANICAL

Journal of Engineering Materials and Technology-transactions of The Asme Pub Date : 2023-10-05 DOI:10.1115/1.4063666

Ruiyu Li, Bing Bai, Lei Deng, Defu Che

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Abstract

Abstract To study the corrosion characteristic of 20G steel in saline circumstances with sodium sulfate (Na2SO4), a series of corrosion experiments are implemented on a novel setup. The corroded steel samples are analyzed by XPS and XRD. The results indicate that the effect of salinity on corrosion products in the gas phase is greater than that in the liquid phase. FeOOH is easier to form in the liquid phase than in the gas phase. The salinity of steam could promote the generation of Fe2O3. The relative content of Fe2O3 within the corrosion products that contained Fe in gas/liquid phase increases from 49.68%/36.30% (Na2SO4 concentration in solution, c = 0) to 95.70%/74.55%, separately (c = 4 g L−1). The salinity has an inhibiting effect on the generation of FeOOH. In the deionized water, the relative contents of FeOOH within the corrosion products that contained Fe are 36.01% (gas phase) and 56.43% (liquid phase), respectively. FeOOH hardly occurs as c = 4 g L−1. For corroded surface in Na2SO4 deposit, the main compositions detected are iron oxides (Fe2O3 and Fe3O4) and iron (Fe).

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20G钢在高温/高压盐水(Na2SO4)环境中的腐蚀行为

摘要为了研究20G钢在盐态硫酸钠(Na2SO4)腐蚀条件下的腐蚀特性，在一种新型装置上进行了一系列腐蚀实验。用XPS和XRD对腐蚀钢试样进行了分析。结果表明，盐度对气相腐蚀产物的影响大于液相腐蚀产物。FeOOH在液相中比在气相中更容易形成。水蒸气的盐度对Fe2O3的生成有促进作用。含铁腐蚀产物中Fe2O3的相对含量分别从49.68%/36.30%(溶液中Na2SO4浓度，c = 0)增加到95.70%/74.55% (c = 4 g L−1)。盐度对FeOOH的生成有抑制作用。在去离子水中，含铁腐蚀产物中FeOOH的相对含量分别为36.01%(气相)和56.43%(液相)。当c = 4 g L−1时，FeOOH几乎不发生。Na2SO4镀层腐蚀表面检测到的主要成分为氧化铁(Fe2O3和Fe3O4)和铁(Fe)。

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来源期刊

Journal of Engineering Materials and Technology-transactions of The Asme 工程技术-材料科学：综合

CiteScore

3.00

自引率

0.00%

发文量

审稿时长

4.5 months

期刊介绍： Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships