Anti-corrosion Methods and Materials最新文献

Pitting behavior of austenitic stainless-steel welded joints with dense inclusions and methods to enhance pitting resistance 含有致密夹杂物的奥氏体不锈钢焊接接头的点蚀行为以及增强抗点蚀能力的方法

IF 1.2 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials

Pub Date : 2024-08-08 DOI: 10.1108/acmm-06-2024-3040

QingYuan Zhou, Yangting Sun, Xiangyu Wang, Xin Tan, Yiming Jiang, Jin Li

Purpose

This study aims to assess the pitting resistance of austenitic stainless steel welded joints fusion zone (FZ) with high density of inclusions before and after surface treatment, including potentiostatic pulse technique (PPT) and pickling.

Design/methodology/approach

The potentiodynamic polarization tests and critical pitting temperature tests were carried out for estimating pitting resistance. The PPT and pickling were performed as surface treatment. Scanning electron microscope (SEM) and energy dispersive spectrometer were used for characterize the microstructure and elemental distribution. Electron back-scattered diffraction (EBSD) was used to assess the portion of phases and morphology of grains.

Findings

The weld metal exhibits a higher degree of alloying compared to the base metal, and it contains d-phase and sulfur-containing inclusions. Sulfur-containing inclusions serve as initiation sites for pitting, and they diminish the pitting resistance of weld metal. Both PPT and pickling can remove sulfur-containing inclusions, but PPT causes localized dissolution of the weld metal matrix around the inclusions, while pickling does not. Because of the high density of inclusions, certain pits initiated by PPT are significantly deeper, which makes the formation of stable pitting easier. Because of the high density of inclusions, certain pits initiated by the PPT are deeper. This characteristic facilitates the progression of these initial defects into fully developed, stable pits.

Originality/value

Analysis of pitting initiation in shielded metal arc welding FZ with PPT and ex situ SEM tracking observation. Explanation of why the PPT surface treatment is not able to enhance the pitting resistance of stainless steel with a high inclusion density.

目的本研究旨在评估具有高密度夹杂物的奥氏体不锈钢焊接接头熔合区（FZ）在表面处理（包括恒电位脉冲技术（PPT）和酸洗）前后的抗点蚀性。PPT 和酸洗是作为表面处理进行的。扫描电子显微镜（SEM）和能量色散光谱仪用于表征微观结构和元素分布。研究结果与母材相比，焊缝金属的合金化程度较高，并含有 d 相和含硫夹杂物。含硫夹杂物是点蚀的起始点，会降低焊接金属的抗点蚀能力。PPT 和酸洗都能去除含硫夹杂物，但 PPT 会导致夹杂物周围的焊接金属基体局部溶解，而酸洗则不会。由于夹杂物密度高，某些由 PPT 引发的点蚀会明显加深，从而更容易形成稳定的点蚀。由于夹杂物密度高，某些由 PPT 引发的凹坑会更深。原创性/价值分析采用 PPT 和原位 SEM 跟踪观察的保护金属弧焊 FZ 中的点蚀引发情况。解释为什么 PPT 表面处理无法增强具有高夹杂密度的不锈钢的抗点蚀能力。

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引用次数: 0

A novel technology for sequestration of corrosive ions in comparison with benzotriazole: a review 与苯并三唑相比，一种新型的腐蚀性离子封存技术：综述

IF 1.2 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials

Pub Date : 2024-08-07 DOI: 10.1108/acmm-04-2024-3009

Osuani Fyneface Idema, Malik Abdulwahab, Innocent Okechi Arukalam, Ifeyinwa Ekeke, Chigoziri N. Njoku, Chioma Anyiam, Benedict Onyeachu, Emeka Emmanuel Oguzie

Purpose

Hexavalent chromium has been a benchmark corrosion inhibitor before it was phased out because of its carcinogenic properties. However, because it was phased out, many alternative corrosion inhibitors have been introduced but failed to meet the performance of this benchmark inhibitor. Consequently, benzotriazole (BTA) was reported to exhibit chromate-like inhibition performance. Subsequently, Intelli-ion was reported by researchers to exhibit chromate-like performance also with claims of being a unique alternative. This paper aims to review the inhibition performance of these two alternatives. Above all, promotes the unique inhibition performance of Intelli-ion that makes it suitable for application in many sectors.

Design/methodology/approach

In this paper, the corrosion inhibition performances of BTA and Intelli-ion were compared systematically by reviewing some related literatures based on the opinion of the authors.

Findings

Different methodologies for measuring the inhibition performance of BTA showed that it’s an inhibitor of choice. However, the cut edge corrosion performance of Intelli-ion and BTA corrosion inhibitors on galvanized steel of 55% Wt.% Al, 44% Wt.% Zn and 1% Wt.% Si in 5 Wt.% NaCl solution was compared when subjected to scanning vibrating electrode technique (SVET) for 24 h. The results showed faint blue-colored region depicting negative cathodic current density for the Intelli-ion while there was a high-intensity of red-colored region depicting a positive anodic current density for BTA. In other words, the Intelli-ion inhibitor had a better overall cut-edge corrosion inhibition performance than the BTA inhibitor.

Originality/value

This paper compares and further, summarizes the corrosion inhibition performance of Intelli-ion and BTA by evaluating SVET results from the literature. In addition, it serves as an overview and reference for the unique inhibition performance of Intelli-ion when applied in field applications.

目的六价铬在因其致癌特性而被淘汰之前，一直是一种基准缓蚀剂。然而，由于六价铬被逐步淘汰，许多替代缓蚀剂被引入，但其性能却无法达到这种基准缓蚀剂的要求。因此，有报告称苯并三唑（BTA）具有类似铬酸盐的抑制性能。随后，研究人员报告称 Intelli-ion 也具有类似铬酸盐的性能，并声称它是一种独特的替代品。本文旨在回顾这两种替代品的抑制性能。本文根据作者的观点，通过查阅一些相关文献，对 BTA 和 Intelli-ion 的缓蚀性能进行了系统比较。研究结果测量 BTA 缓蚀性能的不同方法表明，它是一种首选缓蚀剂。然而，当在 5 重量百分比的氯化钠溶液中加入 55 重量百分比的铝、44 重量百分比的锌和 1 重量百分比的硅时，Intelli-ion 和 BTA 缓蚀剂在镀锌钢上的切边腐蚀性能在扫描振动电极技术（SVET）作用 24 小时后进行了比较。结果显示，Intelli-ion 的阴极电流密度为负，呈微弱的蓝色区域，而 BTA 的阳极电流密度为正，呈高强度的红色区域。换句话说，Intelli-ion 抑制剂的整体切边缓蚀性能优于 BTA 抑制剂。本文通过评估文献中的 SVET 结果，比较并进一步总结了 Intelli-ion 和 BTA 的缓蚀性能。此外，本文还为 Intelli-ion 在现场应用中的独特缓蚀性能提供了概述和参考。

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引用次数: 0

Microstructure, corrosive wear and electrochemical properties of Al2O3 reinforced FeAl coatings by laser cladding 激光熔覆 Al2O3 增强铁铝涂层的微观结构、腐蚀磨损和电化学性能

IF 1.2 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials

Pub Date : 2024-08-06 DOI: 10.1108/acmm-03-2024-2987

Yang Haoming, Kong Dejun

Purpose

This study aims to investigate the influences of Al₂O₃ mass fraction on the corrosive wear and electrochemical behaviors of FeAl–xAl₂O₃ coatings.

Design/methodology/approach

FeAl–xAl₂O₃ coatings were prepared on S355 steel by laser cladding to improve its corrosive wear and electrochemical properties.

Findings

The average coefficients of friction and wear rates of FeAl–xAl₂O₃ coatings are decreased with the Al₂O₃ mass fraction, and the Al₂O₃ plays a positive role in the corrosion wear resistance. Moreover, the charge transfer resistance of FeAl–xAl₂O₃ coatings is increased with the Al₂O₃ mass fraction, showing the FeAl–15%Al₂O₃ coating has the best corrosion resistance. The findings show the corrosion resistance of FeAl–15%Al₂O₃ coating is the highest among the three kinds of coatings.

Originality/value

Al₂O₃ was first added into FeAl coatings to further improve its corrosive wear and electrochemical properties by laser cladding.

目的本研究旨在探讨 Al2O3 质量分数对 FeAl-xAl2O3 涂层腐蚀磨损和电化学行为的影响。设计/方法/方法采用激光熔覆法在 S355 钢上制备 FeAl-xAl2O3 涂层，以改善其腐蚀磨损和电化学性能。研究结果FeAl-xAl2O3 涂层的平均摩擦系数和磨损率随 Al2O3 质量分数的增加而降低，Al2O3 对耐腐蚀磨损性能起积极作用。此外，FeAl-xAl2O3 涂层的电荷转移电阻随 Al2O3 质量分数的增加而增加，表明 FeAl-15%Al2O3 涂层的耐腐蚀性最好。研究结果表明，FeAl-15%Al2O3 涂层的耐腐蚀性是三种涂层中最高的。

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引用次数: 0

The corrosion analysis of X80 pipeline steel welded joint using wire beam electrode and numerical simulation methods 使用线束电极和数值模拟方法对 X80 管线钢焊接接头进行腐蚀分析

IF 1.2 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials

Pub Date : 2024-08-06 DOI: 10.1108/acmm-12-2023-2932

Xiaohui Dou, Yadong Li, Xinwei Zhang, Shengnan Wang, Yang Cheng, Wanpeng Yao, Dalei Zhang, Yan Li

Purpose

The purpose of this study is to characterize the galvanic corrosion behavior of a simulated X80 pipeline steel welded joint (PSWJ) reconstructed by the wire beam electrode (WBE) and numerical simulation methods.

Design/methodology/approach

The galvanic corrosion of an X80 PSWJ was studied using WBE and numerical simulation methods. The microstructures of the coarse-grained heat affected zone, fine-grained heat affected zone and intercritical heat affected zone were simulated in X80 pipeline steel via Gleeble thermomechanical simulation processing.

Findings

Comparing the corrosion current density of coupled and isolated weld metal (WM), base metal (BM) and heat-affected zone (HAZ), the coupled WM exhibited a higher corrosion current density than isolated WM; the coupled BM and HAZ exhibited lower corrosion current densities than isolated BM and HAZ. The results exhibited that the maximum anodic galvanic current fitted the Gumbel distribution. Moreover, the numerical simulation results agreed well with the experimental data.

Originality/value

This study provides insight into corrosion evaluation of heterogeneous welded joints by a combination of experiment and simulation. The method of reconstruction of the welded joint has been proven to be a feasible approach for studying the corrosion behavior of the X80 PSWJ with high spatial resolution.

设计/方法/途径采用线束电极（WBE）和数值模拟方法研究了 X80 管线钢焊接接头（PSWJ）的电化学腐蚀行为。结果比较了耦合和隔离焊缝金属 (WM)、母材 (BM) 和热影响区 (HAZ) 的腐蚀电流密度，耦合 WM 的腐蚀电流密度高于隔离 WM；耦合 BM 和 HAZ 的腐蚀电流密度低于隔离 BM 和 HAZ。结果表明，最大阳极电化电流符合 Gumbel 分布。此外，数值模拟结果与实验数据吻合良好。事实证明，重构焊接接头的方法是以高空间分辨率研究 X80 PSWJ 腐蚀行为的可行方法。

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引用次数: 0

The corrosion behavior of AZ91 bulk alloy and thin films AZ91 块体合金和薄膜的腐蚀行为

IF 1.2 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials

Pub Date : 2024-08-01 DOI: 10.1108/acmm-04-2024-2998

Zhenlei Yang, Yuzhou Du, Bo Ma, Qian Wang, Chao Yang

Purpose

The purpose of this study is to campare the corrosion behavior of Az91 films and bulk sample, in the objective to provide reference for the corrosion resistance improvement of Mg alloys.

Design/methodology/approach

AZ91 films with various thickness values are produced by magnetron sputtering technique, and the corrosion behavior was characterized by immersion tests and electrochemical measurements.

Findings

The AZ91 films exhibited a preferred orientation with basal planes parallel to the surface and increased densification with the increase of thickness, and a superior corrosion resistance for the AZ91 films compared with the bulk sample.

Originality/value

The preferred (0002) basal planes in AZ91 films benefited the corrosion resistance and the nanoscale AZ91 films facilitated the development of a dense passivation film. Consequently, AZ91 film exhibited a superior corrosion resistance.

设计/方法/途径采用磁控溅射技术制备了不同厚度值的 AZ91 薄膜，并通过浸泡试验和电化学测量对其腐蚀行为进行了表征。研究结果AZ91 薄膜表现出基底面平行于表面的优选取向，并且随着厚度的增加，致密性增加，与块状样品相比，AZ91 薄膜具有更优越的耐腐蚀性。因此，AZ91 薄膜表现出卓越的耐腐蚀性。

引用次数: 0

Exploring optimization strategies for support vector machine-based half-cell potential prediction 探索基于支持向量机的半电池电位预测的优化策略

IF 1.2 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials

Pub Date : 2024-08-01 DOI: 10.1108/acmm-04-2024-3007

Shikha Pandey, Yogesh Iyer Murthy, Sumit Gandhi

Purpose

This study aims to assess support vector machine (SVM) models' predictive ability to estimate half-cell potential (HCP) values from input parameters by using Bayesian optimization, grid search and random search.

Design/methodology/approach

A data set with 1,134 rows and 6 columns is used for principal component analysis (PCA) to minimize dimensionality and preserve 95% of explained variance. HCP is output from temperature, age, relative humidity, X and Y lengths. Root mean square error (RMSE), R-squared, mean squared error (MSE), mean absolute error, prediction speed and training time are used to measure model effectiveness. SHAPLEY analysis is also executed.

Findings

The study reveals variations in predictive performance across different optimization methods, with RMSE values ranging from 18.365 to 30.205 and R-squared values spanning from 0.88 to 0.96. Additionally, differences in training times, prediction speeds and model complexities are observed, highlighting the trade-offs between model accuracy and computational efficiency.

Originality/value

This study contributes to the understanding of SVM model efficacy in HCP prediction, emphasizing the importance of optimization techniques, model complexity and dimensionality reduction methods such as PCA.

目的本研究旨在评估支持向量机（SVM）模型的预测能力，通过使用贝叶斯优化、网格搜索和随机搜索，从输入参数估算半电池电位（HCP）值。HCP 由温度、年龄、相对湿度、X 和 Y 长度输出。均方根误差 (RMSE)、R 平方、均方误差 (MSE)、平均绝对误差、预测速度和训练时间用于衡量模型的有效性。研究结果该研究揭示了不同优化方法在预测性能方面的差异，RMSE 值从 18.365 到 30.205 不等，R 平方值从 0.88 到 0.96 不等。此外，还观察到了训练时间、预测速度和模型复杂度的差异，突出了模型准确性和计算效率之间的权衡。

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引用次数: 0

Hot corrosion behavior of selective laser melted TiC/GT D222 nickel-based composite in 75% Na2SO4 and 25% K2SO4 molten salt medium at 900°C 选择性激光熔融 TiC/GT D222 镍基复合材料在 900°C 下 75% Na2SO4 和 25% K2SO4 熔盐介质中的热腐蚀行为

IF 1.2 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials

Pub Date : 2024-07-30 DOI: 10.1108/acmm-06-2024-3031

Yuting Lv, Xing Ouyang, Yaojie Liu, Ying Tian, Rui Wang, Guijiang Wei

Purpose

This paper aims to investigate the differences in hot corrosion behavior of the GTD222 superalloy and TiC/GTD222 composite in a mixed salt of 75% Na₂SO₄ and 25% K₂SO₄ at 900°C.

Design/methodology/approach

The GTD222 superalloy and TiC/GTD222 nickel-based composite were prepared using selective laser melting (SLM). Subsequently, the hot corrosion behavior of the two alloys was systematically investigated in a salt mixture consisting of 75% Na₂SO₄ and 25% K₂SO₄ (Wt.%) at 900°C.

Findings

The TiC/GTD222 composite exhibited better hot corrosion resistance compared to the GTD222 superalloy. First, the addition of alloying elements led to the formation of a protective oxide film on the TiC/GTD222 composites 20 h before hot corrosion. Second, TiC/GTD222 composite corrosion surface has a higher Ti content, after 100 h of hot corrosion, the composite corrosion surface Ti content of 10.8% is more than two times the GTD222 alloy 4% Ti. The Ti and Cr oxides are tightly bonded, effectively resisting the erosion of corrosive elements.

Originality/value

The hot corrosion behavior of GTD222 superalloy and TiC/GTD222 composites prepared by SLM in a mixed salt of 75% Na₂SO₄ and 25% K₂SO₄ was studied for the first time. This study provides insights into the design of high-temperature alloys resistant to hot corrosion.

目的本文旨在研究 GTD222 超级合金和 TiC/GTD222 复合材料在 900°C 下由 75% Na2SO4 和 25% K2SO4 组成的混合盐中的热腐蚀行为差异。随后，系统研究了这两种合金在由 75% Na2SO4 和 25% K2SO4（重量百分比）组成的 900°C 盐混合物中的热腐蚀行为。首先，合金元素的添加导致 TiC/GTD222 复合材料在热腐蚀前 20 小时形成一层保护性氧化膜。其次，TiC/GTD222 复合材料腐蚀表面具有更高的 Ti 含量，经过 100 h 的热腐蚀后，复合材料腐蚀表面 Ti 含量为 10.8%，是 GTD222 合金 4% Ti 含量的两倍多。原创性/价值首次研究了 GTD222 超级合金和通过 SLM 制备的 TiC/GTD222 复合材料在 75% Na2SO4 和 25% K2SO4 混合盐中的热腐蚀行为。这项研究为设计耐热腐蚀的高温合金提供了启示。

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引用次数: 0

The failure mechanism of field polyethylene gas pipeline with gas leakage at electrofusion joint 电熔接头处气体泄漏的现场聚乙烯燃气管道的失效机理

IF 1.2 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials

Pub Date : 2024-07-23 DOI: 10.1108/acmm-04-2024-3000

Qing Bao, Baojin Wang, Manman Li, Chao Li, Jin Gao

Purpose

A section of in-service PE gas pipeline in Guocun, Beijing, was found to appear gas leaking at the electrofusion (EF) joint. This study is dedicated to reveal the material cause of EF joint failure to help with a more accurate prediction of service life of PE gas pipe and further normalize the construction of PE gas pipeline.

Design/methodology/approach

Defect detection was carried out on the leaking EF joint using ultrasonic phased array. The mechanical degradation and structural aging behavior was studied by tension test, FTIR technology, TG test and DSC test. The organic components in the soil surrounding the PE gas pipe failure area were qualitatively identified.

Findings

The results showed that the organic surfactants in the soil environment could accelerate the aging behavior of PE material, leading to a deterioration of mechanical properties and a serious reduction in the ability of the PE pipe and EF joint, especially at the welding defect, to resist external force.

Originality/value

A novel study was conducted to investigate the failure cause of the EF joint of in-service PE gas pipe, incorporating the analysis of environmental factors and structural deterioration.

目的在北京郭村的一段在役聚乙烯燃气管道上发现电熔（EF）接头处有气体泄漏。本研究致力于揭示电熔接头失效的材料原因，以帮助更准确地预测聚乙烯燃气管道的使用寿命，并进一步规范聚乙烯燃气管道的施工。通过拉伸试验、傅立叶变换红外技术、TG 试验和 DSC 试验研究了机械降解和结构老化行为。结果表明，土壤环境中的有机表面活性剂会加速聚乙烯材料的老化行为，导致聚乙烯管材和 EF 接头（尤其是焊接缺陷处）的机械性能恶化，抵抗外力的能力严重下降。

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引用次数: 0

Research on the corrosion inhibition performance and mechanism of pyrimidine quaternary ammonium salt 嘧啶季铵盐的缓蚀性能及机理研究

IF 2.3 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials

Pub Date : 2024-07-18 DOI: 10.1108/acmm-04-2024-3006

Minglu Shao, Zhanqi Fang, Mengjie Cheng, Lipei Fu, Kaili Liao, Ailian Chang

PurposeAt present, research on the preparation of corrosion inhibitors using modified pyrimidine derivatives is still blank. The purpose of this study is to synthesize a new cationic mercaptopyrimidine derivative quaternary ammonium salt, known as DTEBTAC, that can be used as a corrosion inhibitor to slow down the metal corrosion problems encountered in oil and gas extraction processes.Design/methodology/approachA new corrosion inhibitor was synthesized by the reaction of anti-Markovnikov addition and nucleophilic substitution. The weight loss method was used to study the corrosion inhibition characteristics of synthetic corrosion inhibitors. Electrochemical and surface topography analyses were used to determine the type of inhibitor and the adsorption state formed on the surface of N80 steel. Molecular dynamics simulations and quantum chemistry calculations were used to investigate the synthetic corrosion inhibitor’s molecular structure and corrosion inhibition mechanisms.FindingsThe results of the weight loss method show that when the dosage of DTEBTAC is 1%, the corrosion rate of N80 steel in hydrochloric acid solution at 90? is 3.3325 g m-2 h-1. Electrochemical and surface morphology analysis show that DTEBTAC can form a protective layer on the surface of N80 steel, and is a hybrid corrosion inhibitor that can inhibit the main anode. Quantum chemical parameter calculation shows that DTEBTAC has a better corrosion inhibition effect than DTP. The molecular dynamics simulation results show that DTEBTAC has stronger binding energy than DTP, and forms a network packing structure through hydrogen bonding, and the adsorption stability is enhanced.Originality/valueA novel cationic mercaptopyrimidine derivative quaternium-ammonium salt corrosion inhibitor was designed and provided. Compared with the prior art, the preparation method of the synthesized mercaptopyrimidine derivative quaternary ammonium salt corrosion inhibitor is simple, and the presence of nitrogen-positive ions, sulfur atoms and nitrogen-rich atoms has an obvious corrosion inhibition effect, which can be used to inhibit metal corrosion during oil and gas field exploitation. It not only expands the application field of new materials but also provides a new idea for the research and development of new corrosion inhibitors.

目的目前，利用改性嘧啶衍生物制备缓蚀剂的研究尚属空白。本研究的目的是合成一种新的阳离子巯基嘧啶衍生物季铵盐，即 DTEBTAC，可用作缓蚀剂来减缓油气开采过程中遇到的金属腐蚀问题。设计/方法/途径通过反马尔科夫尼科夫加成和亲核取代反应合成了一种新的缓蚀剂。采用失重法研究了合成缓蚀剂的缓蚀特性。利用电化学和表面形貌分析确定了抑制剂的类型以及在 N80 钢表面形成的吸附状态。研究结果失重法结果表明，当 DTEBTAC 的用量为 1%时，N80 钢在盐酸溶液中 90° C 的腐蚀速率为 3.3325 g m-2 h-1。电化学和表面形貌分析表明，DTEBTAC 能在 N80 钢表面形成保护层，是一种能抑制主阳极的混合缓蚀剂。量子化学参数计算表明，DTEBTAC 的缓蚀效果优于 DTP。分子动力学模拟结果表明，DTEBTAC比DTP具有更强的结合能，并通过氢键形成网状堆积结构，吸附稳定性增强。与现有技术相比，所合成的巯基嘧啶衍生物季铵盐缓蚀剂制备方法简单，氮正离子、硫原子和富氮原子的存在具有明显的缓蚀效果，可用于抑制油气田开采过程中的金属腐蚀。它不仅拓展了新材料的应用领域，也为新型缓蚀剂的研发提供了新思路。

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引用次数: 0

Experimental and simulation analysis of mechanical property degradation of corrosion thinning of Q355 steel for transmission towers 输电塔用 Q355 钢腐蚀减薄机械性能退化的实验和模拟分析

IF 1.2 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Anti-corrosion Methods and Materials

Pub Date : 2024-07-09 DOI: 10.1108/acmm-03-2024-2982

Xin Guo, Jiesong Tu, Zhibin Fan, Baoshuai Du, Hongfei Shang, Jiangfeng An, Dan Jia

Purpose

Corrosion thinning reduces the effective cross-sectional areas of steel structures and degrades their mechanical properties. This study aims to investigate the relationship between the corrosion thinning of carbon steel for transmission towers and the degradation of its mechanical properties.

Design/methodology/approach

A macroscopic finite element model of a transmission tower was established and then combined with the corrosion thinning and mechanical properties of Q355 steel in different test periods measured in neutral salt spray, SO₂ atmosphere and wet heat environments to conduct a finite element simulation of a transmission tower with different corrosion thinning of Q355 steel.

Findings

When the residual thickness of the tower leg angle was reduced to 4.03 mm, the maximum stress solved in the simulation exceeded the yield strength, with the tower already at risk of collapse owing to corrosion failure under extreme conditions of basic wind speed.

Originality/value

This study innovatively utilises transmission tower finite element models and experimental data from mechanical degradation experiments to quantify the relationship between corrosion thinning and the mechanical properties of Q355 steel, ensuring the effective assessment of the mechanical properties of corroded transmission towers.

目的腐蚀减薄会减小钢结构的有效截面积并降低其机械性能。建立了输电塔的宏观有限元模型，然后结合 Q355 钢在中性盐雾、SO2 大气和湿热环境下不同试验周期测量的腐蚀减薄和力学性能，对 Q355 钢不同腐蚀减薄的输电塔进行有限元模拟。研究结果当塔腿角的残余厚度减小到 4.03 毫米时，模拟中求解的最大应力超过了屈服强度，在基本风速的极端条件下，铁塔已面临因腐蚀失效而倒塌的风险。原创性/价值这项研究创新性地利用输电塔有限元模型和机械退化实验数据，量化了腐蚀减薄与 Q355 钢机械性能之间的关系，确保了对腐蚀输电塔机械性能的有效评估。

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引用次数: 0