Study on intermediate annealing-twice nitriding process and corrosion resistance of pure iron

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-10-08 DOI:10.1016/j.matchar.2025.115631

Xiangpeng Chang , Shuang Liu , Tianxiang Huang , Zelin Yan , Yingfan Zhao , Weiping Tong , Jianjun Wang

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Abstract

To address the challenge of increasing the thickness of the nitriding layer, an intermediate annealing-twice nitriding process was applied to pure iron, and the corrosion resistance of the nitriding samples was investigated. After the intermediate annealing-twice nitriding treatment, the thickness of the compound layer in the sample increased by 84 % compared to once nitriding, reaching 48.14 μm, while the transition layer thickness increased by 57 % to 52.49 μm. The intermediate annealing process at 600 °C for 1 h yielded a superior twice nitriding effect. And the intermediate annealing-twice nitriding process resulted in a significantly thicker nitriding layer compared to simple twice nitriding. The phase transformation and thickening mechanism of the nitriding layer during the process were revealed by EBSD, XRD, and TEM. Electrochemical tests showed that the nitriding samples exhibited repeated passivation behavior, and the sample with a thicker compound layer demonstrated better corrosion resistance.

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纯铁中间退火-二次渗氮工艺及耐蚀性研究

为了解决增加渗氮层厚度的难题，对纯铁进行了中间退火-二次渗氮工艺，并对渗氮样品的耐蚀性进行了研究。中间退火-二次渗氮处理后，复合层厚度比一次渗氮增加了84%，达到48.14 μm，过渡层厚度增加了57%，达到52.49 μm。中间退火工艺在600℃下退火1h，获得了较好的二次氮化效果。中间退火-二次渗氮工艺的渗氮层明显比简单的二次渗氮层厚。利用EBSD、XRD和TEM分析了渗氮层在渗氮过程中的相变和增厚机理。电化学测试结果表明，渗氮样品具有重复钝化行为，渗氮层较厚的样品具有较好的耐蚀性。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.