Materials and Corrosion最新文献_第7页

Tannins as interphase corrosion inhibitors for aluminum in near‐neutral chloride solutions 单宁在近中性氯溶液中作为铝的相间缓蚀剂

Materials and Corrosion Pub Date : 2022-01-20 DOI: 10.1002/maco.202112765

C. Byrne, Oriana D'Alessandro, C. Deyá

{"title":"Tannins as interphase corrosion inhibitors for aluminum in near‐neutral chloride solutions","authors":"C. Byrne, Oriana D'Alessandro, C. Deyá","doi":"10.1002/maco.202112765","DOIUrl":"https://doi.org/10.1002/maco.202112765","url":null,"abstract":"The addition of tara and quebracho colorado tannins remarkably reduces the corrosion rate of aluminum in near‐neutral and naturally aerated NaCl solutions. The experimental results (potentiodynamic polarization curves, corrosion potential measurements, scanning electron microscopy–energy‐dispersive X‐ray spectroscopy [SEM‐EDS] analysis on exposed surfaces) show that both tannins behave as a mixed‐type corrosion inhibitor of aluminum. In the absence of tannins, the SEM‐EDS analysis of the exposed samples demonstrates the accumulation of corrosion products and the existence of chlorinated compounds adsorbed on the metal surface. In the samples immersed in both tannins solutions, a more homogenous and compact layer is formed over the aluminum surface. Furthermore, in these layers chlorine was not found, revealing a high blocking capacity of the chloride adsorption when the tannins are present. Taking into account these findings, an inhibitory mechanism of aluminum corrosion is proposed. This mechanism is interphase inhibition, which involves the adsorption and incorporation of tannin molecules during the corrosion products passive layer formation, resulting in a protective three‐dimensional structure that retards both anodic and cathodic reactions.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"65 1","pages":"798 - 810"},"PeriodicalIF":0.0,"publicationDate":"2022-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89834856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Enhanced predictive corrosion modeling of crevice evolution at e‐coat defects under cyclic climate conditions 循环气候条件下e - coat缺陷裂缝演化的增强预测腐蚀模型

Materials and Corrosion Pub Date : 2022-01-19 DOI: 10.1002/maco.202112930

Benjamin Wagner, Andreas Mittelbach, P. Geiss

引用次数: 0

Investigation into creep‐to‐rupture of SIMP steel in stagnant LBE at 300–450°C SIMP钢在300-450°C停滞LBE中蠕变至断裂的研究

Materials and Corrosion Pub Date : 2022-01-13 DOI: 10.1002/maco.202112887

Qing Liao, Bingsheng Li, F. Ge, Renda Wang, Hongpeng Zhang, V. Kršjak, Yanbin Sheng

引用次数: 2

Enhancement of barrier and corrosion protection performance of epoxy coatings through adding eco‐friendly lamellar biochar 添加环保层状生物炭提高环氧涂料的阻隔和防腐性能

Materials and Corrosion Pub Date : 2022-01-07 DOI: 10.1002/maco.202112697

Beibei Zhang, G. Wang, Shenghua Ma, Hui Wang, J. Bai

{"title":"Enhancement of barrier and corrosion protection performance of epoxy coatings through adding eco‐friendly lamellar biochar","authors":"Beibei Zhang, G. Wang, Shenghua Ma, Hui Wang, J. Bai","doi":"10.1002/maco.202112697","DOIUrl":"https://doi.org/10.1002/maco.202112697","url":null,"abstract":"Biomass, as a green and renewable energy source, can be procured from a broad range of sources and is low in cost. The full exploitation of biomass could reduce the dependence on and consumption of fossil fuels, and is conducive to the protection of the environment. The prevention of corrosion of metals is an issue considered problematic in many fields, including in industrial production among others. Many anticorrosion materials are expensive and are noxious to the environment. This is an important issue that anticorrosion workers cannot ignore. This study proposes the use of biochar epoxy to boost the barrier properties of the coating, which is both economical and eco‐friendly. The incorporation of biochar can reduce the porosity of the coating and complicate the path of the corrosive media towards the steel substrate. Additionally, it can also reinforce the anticorrosion performance of the coatings. First, this article introduces the effect of biochars with different ultrasonic durations on the anticorrosion performance of anticorrosion coatings. After finding the biochar with the optimal ultrasonic duration, the effects of biochar on the anticorrosion performance of the coatings at different temperatures are assessed and the changes in its anticorrosion performance following soaking are discussed. The discussion concludes that applying biochar to anticorrosion coatings provides a feasible type of coating for anticorrosion work.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"46 1","pages":"720 - 732"},"PeriodicalIF":0.0,"publicationDate":"2022-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86766034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formation and corrosion resistance of a novel Co–Ti–Mo composite chromium‐free chemical conversion coating on LY12 aluminum alloy LY12铝合金上新型Co-Ti-Mo复合无铬化学转化涂层的形成及其耐蚀性

Materials and Corrosion Pub Date : 2022-01-06 DOI: 10.1002/maco.202112951

Xuzheng Qian, Waner Zhao, W. Zhan, Tianyue Zhang, Jingjing Pan, Yiting Liu

{"title":"Formation and corrosion resistance of a novel Co–Ti–Mo composite chromium‐free chemical conversion coating on LY12 aluminum alloy","authors":"Xuzheng Qian, Waner Zhao, W. Zhan, Tianyue Zhang, Jingjing Pan, Yiting Liu","doi":"10.1002/maco.202112951","DOIUrl":"https://doi.org/10.1002/maco.202112951","url":null,"abstract":"A novel type of Co–Ti–Mo conversion coating (CoTiMoCC) was prepared on LY12 aluminum alloy, furthermore the optimal formula and the effect of conversion time (CTI) were studied in detail. The micromorphology and phase compositions were systematically investigated by scanning electron microscopy and X‐ray photoelectron spectroscopy, and the corrosion resistance was determined by dropping test, electrochemical tests, and immersion test. Results reveal that the best formula of CoTiMoCC is Co2SO4: 2.0 g/L, H2TiF6: 1.5 ml/L, and Na2MoO4: 1.0 g/L and the corresponding optimal CTI is 16 min. Significantly, the micromorphology of CoTiMoCC under the best conversion condition is relatively smooth, continuous, and dense, and the major elements on the surface are Co, Ti, Mo, Al, O, and F. The phase compositions mainly consist of CoO, Co3O4, MoO3, Mo2O5, TiO2, and Al2O3, as well as a small quantity of AlF3·3H2O and Na3AlF6. Compared with the Al alloy matrix, CoTiMoCC acquires an order of magnitude lower Icorr and thus significantly reduces its corrosion rate, which is also confirmed by electrochemical impedance spectroscopy results. Further study of immersion test exhibits that the corrosion resistance of CoTiMoCC is approximately five times that of Al alloy matrix, and no obvious corrosion spots are generated on its surface.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"25 1","pages":"710 - 719"},"PeriodicalIF":0.0,"publicationDate":"2022-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76125394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Roles of Sb addition on the corrosion resistance of the low‐alloy steel in a real tropical marine atmosphere 添加Sb对低合金钢在真实热带海洋大气中耐腐蚀性能的影响

Materials and Corrosion Pub Date : 2022-01-05 DOI: 10.1002/maco.202112818

Wei Wu, Niyun Liu, Peilin Chai, Li-li Zhu, Shiyu Huang, Ying Yang, Bo Zhao, Zhiyong Liu

引用次数: 1

Cyclic oxidation behavior of MCrAlX coatings made by electrolytic codeposition 电解共沉积MCrAlX涂层的循环氧化行为

Materials and Corrosion Pub Date : 2022-01-04 DOI: 10.1002/maco.202112843

Ying Zhang, Jason Witman, S. Dryepondt

引用次数: 0

Machine learning‐based analysis and prediction of the interfacial corrosion processes of copper cathode plates during the electrolytic production of copper powders 基于机器学习的铜阴极板在电解生产铜粉过程中的界面腐蚀过程分析和预测

Materials and Corrosion Pub Date : 2022-01-02 DOI: 10.1002/maco.202112977

Youzhi Zhou, Pengcheng Lin, Xin Ke, Qiang Hu, Qi Shi, Jingguo Zhang, Zhong Wang, Limin Wang

{"title":"Machine learning‐based analysis and prediction of the interfacial corrosion processes of copper cathode plates during the electrolytic production of copper powders","authors":"Youzhi Zhou, Pengcheng Lin, Xin Ke, Qiang Hu, Qi Shi, Jingguo Zhang, Zhong Wang, Limin Wang","doi":"10.1002/maco.202112977","DOIUrl":"https://doi.org/10.1002/maco.202112977","url":null,"abstract":"Present efforts to support the essential industrial‐scale electrolytic production of copper‐based metal powders urgently require approaches to the real‐time predicting of corrosion of copper cathodes employed in electrolytic production processes. However, current approaches are extremely limited owing to the difficulty of accurately modeling the complex cathode corrosion process. In this study, the corrosion process under different parameters was analyzed by a self‐designed continuous electrolytic corrosion experimental device, clarify the influence mechanism of current density on the corrosion of the solid–liquid–gas interface area, and addresses this issue by applying a random forest machine learning approach based on three process parameters, including the electrolyte temperature, liquid‐level fluctuation cycle period, and current density. The dataset employed in the model is obtained using a novel experimental corrosion test method based on electrode arrays. The experimental results include the corrosion rates of copper cathode plates at different positions relative to the liquid electrolyte level during the electrolysis process. The resulting stochastic model is demonstrated to obtain a high prediction accuracy of 97% for the various regions of copper cathode plates defined according to liquid electrolyte level.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"77 1","pages":"811 - 825"},"PeriodicalIF":0.0,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79345430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

EFC Newsletter EFC通讯

Materials and Corrosion Pub Date : 2022-01-01 DOI: 10.1002/maco.202270015

引用次数: 0

Corrosion protection properties of poly(4‐vinyl pyridine) containing multilayer polymeric coatings on magnesium alloy AZ31 含聚(4 -乙烯基吡啶)多层聚合物涂层在镁合金AZ31上的防腐性能

Materials and Corrosion Pub Date : 2021-12-10 DOI: 10.1002/maco.202112708

Chayanika Das, Eleni Kastania, J. Witt, O. Ozcan

引用次数: 3