在基于铁的无形合金高密度被动化过程中Cr元素的作用
Ziqi Song1, Zhaoxuan Wang1, Qi Chen1
1Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), School of Materials Science and Engineering, Shandong University, Jinan 250061, China.
Materials (Basel, Switzerland)
|October 28, 2023
概括
将 (Cr) 添加到基于铁的合金中,可以提高其耐腐蚀性和硬度. 在NaCl溶液中观察到7.2%Cr的最佳腐蚀保护,形成一种保护性被动膜.
科学领域:
- 材料科学 材料科学 材料科学
- 腐蚀工程 腐蚀工程
- 物理化学 物理化学
背景情况:
- 基于铁的无形合金对各种应用具有前景,但其耐腐蚀性需要优化.
- 合金元素,如 (Cr) 对这些合金的结构和电化学性能的影响对于提高性能至关重要.
- 了解被动化行为和薄膜成分是预测和改善化物环境中耐腐蚀性的关键.
研究的目的:
- 为了研究不同含量 (036at.%) 对线Fe72-xCrxB19.2Si4.8Nb4带的腐蚀行为的影响.
- 为了将合金组成和微观结构与耐腐蚀性和硬度性能相关联.
- 分析腐蚀过程中形成的被动膜的组成和有效性.
主要方法:
- 使用造线制备具有不同Cr度的Fe基丝带.
- 在3.5%的NaCl溶液中进行电化学腐蚀试验,包括偏振测量.
- 射线光电子光谱 (XPS) 分析以确定被动膜组成.
主要成果:
- 玻璃的可塑性得到了改善,Cr的添加达到了21.6%.%,而纳米晶体则出现了36%.
- 带的耐腐蚀性和硬度随着Cr的含量增加而增加.
- 观察到的最高喷潜力为7.2%Cr,归因于密集的被动薄膜 (Cr2O3和化氧化) 减少了喷,尽管过量的Cr可能是有害的.
结论:
- 添加显著提高了基于Fe的无形丝带的耐腐蚀性和硬度.
- 特定的Cr含量 (7.2at.%) 优化了被动薄膜的形成,提供了对化物诱导的腐蚀的优越保护.
- 这项研究通过控制Cr含量和微观结构,为设计高度耐腐蚀的Fe基合金提供了洞察力.
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