多尺度（Ti, Mo）C在激光熔覆铁基复合涂层显微组织演变和腐蚀行为中的作用

IF 4.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Chemistry and Physics Pub Date : 2025-09-22 DOI:10.1016/j.matchemphys.2025.131601

Dong Zhang , Chunzhi Zhang , Xueming Wei , Yaxin Ji , Lijun Zhang , Qi Liu , Wensheng Li

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引用次数: 0

摘要

本研究采用原位激光熔覆法制备了多尺度（Ti, Mo） c增强Fe-Cr-Mo基复合涂层，系统研究了激光功率和沉积速度对相组成和微观组织演变的影响。通过静浸试验和电化学分析，对其在3.5 wt% NaCl溶液中的腐蚀行为进行了表征。涂层主要由α-Fe和m23c6型碳化物组成，呈现出随参数变化的微观组织演化特征。在1500 W激光功率下，富cr层错促进钝化膜成核，Mo氧化物增强抗点蚀能力，纳米（Ti, Mo）C颗粒隔离阴极位置抑制微电蚀，三者协同作用增强了耐蚀性。该研究为设计具有工程耐腐蚀性的激光熔覆涂层提供了重要的见解。

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Role of multi-scale (Ti, Mo)C in microstructural evolution and corrosion behaviour of laser-clad Fe-based composite coatings

In this study, multi-scale (Ti, Mo)C-reinforced Fe–Cr–Mo based composite coatings were fabricated via in situ laser cladding, with systematic investigation of laser power and deposition speed effects on phase composition and microstructure evolution. The corrosion behavior in 3.5 wt% NaCl solution was characterized through static immersion tests and electrochemical analysis. The coatings primarily consisted of α-Fe and M₂₃C₆-type carbides, exhibiting parameter-dependent microstructural evolution. The enhanced corrosion resistance at 1500 W laser power arose through synergistic interactions between Cr-rich stacking faults promoting passive film nucleation, Mo oxides imparting pitting resistance, and nano-(Ti, Mo)C particles isolating cathodic sites to suppress microgalvanic corrosion. This study provides critical insights for designing laser-cladded coatings with engineered corrosion resistance.

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来源期刊

Materials Chemistry and Physics 工程技术-材料科学：综合

CiteScore

8.70

自引率

4.30%

发文量

1515

审稿时长

69 days

期刊介绍： Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.