Insight into the Ni microalloying effects on the corrosion characteristics and mechanism of Fe-21Mn-10Al-1.25C lightweight steels in chloride-containing solution

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-26 DOI:10.1016/j.conbuildmat.2024.139313

Weihan Yu, Yuqin Feng, Tonghan Guo, Wei Wu, Junxi Zhang

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引用次数: 0

Abstract

Lightweight alloys primarily composed of iron (Fe), manganese (Mn), aluminum (Al), and carbon (C) are considered promising structural materials due to their excellent mechanical properties and low weight. The corrosion resistance of FeMnAlC alloys has recently gained widespread attention due to their great potential for service in marine environments. This paper studied the impact of Ni addition on the microstructure and corrosion resistance of an austenitic Fe-21Mn-10Al-1.25 C alloy in 3.5 % NaCl solution by microstructural analysis, electrochemical and immersion tests. Results showed that Ni addition worsened the corrosion resistance of the alloy. Specifically, the formation of (Ni, Al)-enriched B2 phases along grain boundaries significantly enhanced micro galvanic corrosion effect, leading to rapid dissolution of the austenitic matrix. Moreover, localized corrosion was accelerated by the increase in the proportion of high-angle grain boundaries and local dislocation density. Consequently, an inhomogeneous product film with segregation of Al and Cl elements was formed, providing inadequate protection for Fe-21Mn-10Al-1.25 C alloy.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.