Corrosion resistance properties and protective mechanisms of Al2O3-doped Inconel 625 coatings prepared by laser cladding in high-temperature acidic environments

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2025-03-23 DOI:10.1016/j.psep.2025.107057

Xuming Wu , Zhaohui Wang , Bin Li , Heng Tao , Chenchen Zhao , Yufeng Wu

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引用次数: 0

Abstract

This study investigates the corrosion resistance and protective mechanisms of laser-clad Al₂O₃-doped Inconel 625 coatings under high-temperature acidic conditions. Inconel 625-xAl₂O₃ coatings were fabricated via laser cladding and tested in high-temperature acidic environments simulating pipeline conditions. Corrosion media included HCl, H₂SO₄, HF, HBr (pH=3), and their 1:1:1:1 mixed acid. High-temperature cyclic titration was employed for corrosion testing, while XRD, SEM, EDS, and laser confocal microscopy were used to analyze microstructure, composition, and corrosion products. Results show that increasing Al₂O₃ content significantly enhances corrosion resistance, reducing rates by 57.9 % in HCl and 46.4 % in HF. Al₂O₃ forms a stable protective layer, acting as a physical barrier and inhibiting grain growth. A dual-layer oxide film (Al₂O₃ and Cr₂O₃) effectively blocks corrosive substance diffusion, further enhancing protection. This study elucidates the pivotal role of Al₂O₃ in improving the corrosion resistance of Inconel 625 coatings and offers novel insights for the development of high-performance protective coatings tailored for extreme environments.

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.