氧的进化反应驱动了Ni-Cr-Mo合金的被动性分解
Alfred Larsson1, Andrea Grespi1, Giuseppe Abbondanza1
1Lund University, Division of Synchrotron Radiation Research, Lund, 221 00, Sweden.
Advanced materials (Deerfield Beach, Fla.)
|July 12, 2023
概括
Ni-Cr-Mo合金的腐蚀与氧演化反应 (OER) 有关,氧演化反应会降解保护性氧化膜. 了解这种OER机制是防止工业应用中材料故障的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 腐蚀科学 腐蚀科学
背景情况:
- 金属材料的寿命受到腐蚀的限制,特别是对金属-液体接口上的被动薄膜的挑战性研究.
- Ni-Cr-Mo合金在工业应用中至关重要,但容易腐蚀.
- 了解被动薄膜分解对于预测和防止材料降解至关重要.
研究的目的:
- 研究Ni-Cr-Mo合金中被动薄膜分解的机制.
- 阐明氧进化反应 (OER) 在腐蚀中的作用.
- 为了区分分解机制与典型的横流溶解.
主要方法:
- 结合使用基于同步子的技术和电化学方法.
- 在阳极电位下对被动薄膜行为的研究.
- 分析金属溶解和表面过程.
主要成果:
- Ni-Cr-Mo合金对氧演化反应 (OER) 有活性.
- OER的出现与被动性损失和金属明显溶解相关.
- 被动性分解是由Mo氧化 (Mo4+到Mo6+) 和随后的溶解驱动的,而不是Cr6+的释放.
结论:
- 氧化演化反应 (OER) 在Ni-Cr-Mo合金的被动性分解中发挥着关键作用.
- 由OER引起的表面酸化在高电流密度下加速金属溶解.
- 这些合金在OER中的催化活性必须在腐蚀研究中考虑.
更多相关视频
11:25Identification and Quantification of Decomposition Mechanisms in Lithium-Ion Batteries; Input to Heat Flow Simulation for Modeling Thermal Runaway
Published on: March 7, 2022
4.6K
09:02Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
7.8K
相关概念视频
Oxidation-Reduction Reactions
65.2K
Oxidation–Reduction Reactions
65.2K
Oxidative Cleavage of Alkenes: Ozonolysis
10.6K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
10.6K
Phase I Oxidative Reactions: Overview
307
Phase I biotransformation, or functionalization, is a crucial chemical process that converts drugs and other xenobiotics into more water-soluble forms, facilitating expulsion from the body. It involves oxidative, reductive, and hydrolytic reactions that add or unveil polar functional groups on lipophilic substrates. Key players in phase I reactions are the mixed-function oxidases. Situated in liver cell microsomes, these enzymes predominantly carry out drug metabolism. They require molecular...
307
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.4K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.4K
Oxidation of Alcohols
13.3K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
13.3K
Redox Equilibria: Overview
593
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
593
