Unraveling the influence of Mo on the corrosion mechanism of Ni-advanced weathering steel in harsh marine atmospheric environments

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外文摘要：Ni-advanced weathering steel holds paramount importance in marine atmospheric environments,espe-cially those with heightened Cl-concentrations.The meticulous compositional design plays a crucial role in establishing a rust layer capable of withstanding intrusion by Cl-,making it imperative for the viability of coating-free weathering steel in marine atmospheric environments.This study explores the corrosion evolution and corrosion-resistant mechanisms within a steady-state rust layer in 3Ni weathering steel,with a particular focus on the role of Mo in challenging marine atmospheric conditions.The findings un-equivocally demonstrate that the augmentation of the protective properties of the rust layer is directly correlated with an increase in Mo content,transitioning from 0.5 to 1.5 wt.％.This transition is most ev-ident in the reduction of the corrosion rate for the 3Ni-Mo steel,dropping from an initial 1.74 mm a-1 to a robust 1.31 mm a-1 after 768 h of corrosion exposure.The heightened Mo content expedites the formation of a stable and durable rust layer,significantly enriching the proportion of α-FeOOH within this protective layer.The stabilized rust layer of 3Ni-Mo weathering steel exhibits a distinct three-layer structure,comprising an outer layer primarily of γ-FeOOH,an intermediate layer mainly composed of Fe2O3/Fe3O4,and an inner layer predominantly composed of α-FeOOH and β-FeOOH.Additionally,an al-kaline interface enriched with NiFe2O4 and CuFe2O4 develops between the inner layer and the substrate.Firstly,Mo promotes the deposition of MoO2,MoO3,and molybdate on both the inner layer and alka-line steel-rust interface to repair corrosion pits and fill cracks.Secondly,Mo facilitates the generation of compounds such as NiFe2O4 and CuFe2O4,which heightens the electronegativity of the intermediate rust layer and the steel-rust interface,preventing Cl--induced interface acidification and pitting corrosion.The higher Mo content expedites the formation of this alkaline interface and promotes inner layer den-sification.Most significantly,Mo creates additional nucleation sites for hydroxide oxides through oxide formation,leading to the formation of nano-sized α-FeOOH and β-FeOOH within the inner layer thereby enhancing the stability and compactness of the inner layer.These synergistic effects fortify the resilience of 3Ni-Mo advanced weathering steel in corrosive environments,ultimately strengthening its capacity to withstand environmental challenges.

外文关键词：

3Ni-Mo weathering steelCorrosion behaviorCorrosion-resistant mechanismsStable rust layer

作者：

Gang Niu、Rui Yuan、Enmao Wang、Xiaojia Yang、Zhiying Liu、Zhangyin Li、Zhihui Zhang、Na Gong、Kun Li、Baoxian Su、Junhua Zhang、Huibin Wu、Xiaogang Li、Lawrence E.Murr

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作者单位：

Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China

Engineering Technology Research Institute,Chery Automobile Co.,Ltd.,Wuhu 241006,China

Max-Planck-Institut für Eisenforschung GmbH,Max-Planck-Str.1,D-40237 Düsseldorf,Germany

Institute of Materials Research and Engineering(IMRE),Agency for Science,Technology and Research(A*STAR),2 Fusionopolis Way,Innovis #08-03,Singapore 138634,Republic of Singapore

College of Mechanical and Vehicle Engineering,Chongqing University,Chongqing 400044,China

National Key Laboratory for Precision Hot Processing of Metals,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China

Department of Metallurgical,Materials and Biomedical Engineering,University of Texas at El Paso,El Paso,TX 79968,USA

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基金：

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesChina Postdoctoral Science FoundationStructural Metal Alloy Program(SMAP)Manufacturing of Multi-Material Net-Shape Parts with Heterogeneous Properties(MMNH)in A*STAR

项目编号：

2021YFB370170052304389FRF-BD-23-012022M720402A18B1b0061M22K5a0045

出版年：

2024

DOI：

10.1016/j.jmst.2024.02.021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.195(28)