无形铁/Al-12Si活塞复合材料具有核心外结构的腐蚀行为
Yingdong Wang1, Zuxiang Lin1, Chengzhou Liu1
1College of Mechanical and Transportation Engineering, Southwest Forestry University, Kunming, 650224, China.
Scientific reports
|January 22, 2025
概括
将铁 (Fe) 无形颗粒添加到- (Al-12Si) 中,可以提高生物柴油发动机组件的耐腐蚀性. 最佳的注 (2-10%) 改善了被动化,减少了腐蚀,10%的Fe显示出最好的结果.
科学领域:
- 材料科学 材料科学 材料科学
- 腐蚀工程 腐蚀工程
- 部落学 (tribology) 是一个学科.
背景情况:
- 目前的Al-12Si活塞材料在生物柴油发动机滑系统中易受腐蚀,原因是被动化不足,特别是在离子 (Cl-) 存在的情况下.
- 铁 (Fe) 形态颗粒提供了作为强化剂的潜力,因为它们具有出色的耐腐蚀性,被动化能力和高温稳定性,与Al-12Si具有良好的兼容性.
研究的目的:
- 合成和表征无形铁/Al-12Si核心外结构复合材料 (FACS) 以提高活塞材料性能.
- 研究FACS在模拟生物柴油发动机环境中的电化学腐蚀行为和机制.
- 为了确定Fe无形颗粒的最佳兴奋剂度,以提高耐腐蚀性.
主要方法:
- 通过球磨和热挤压合成FACS.
- 使用X射线衍射,光学显微镜和EDS光谱学进行表征.
- 电化学腐蚀通过潜在动力学极化和电化学阻抗光谱学的评估.
主要成果:
- 在440°C处理后,铁无形粒子保留了它们的无形结构和被动化能力.
- 最佳的注 (2-10%Fe) 导致FACS具有统一的组成,高密度,低孔隙性,以及改善的耐腐蚀性 (减少icorr,增加Ecorr).
- 过度的兴奋剂 (20% Fe) 导致聚合,缺陷和降低耐腐蚀性.
结论:
- 无形铁颗粒通过促进均的表面电位和改善被动化,提高了Al-12Si的耐腐蚀性.
- 与纯Al-12Si相比,含有2-10%Fe无形颗粒的FACS显示出明显改善的耐腐蚀性.
- 含有10%Fe无形颗粒的FACS具有最高的耐腐蚀性,被确定为生物柴油发动机活塞的有前途材料.
相关概念视频
Corrosion of Reinforcement
159
The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
159
Mechanical Characteristics of Steel
391
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
391
Behavior of Concrete Under Compressive Load
143
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
143
Ferromagnetism
2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
Thin-Walled Hollow Shafts
165
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
165
Alkali Aggregate Reaction in Concrete
86
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
86


