Neutron Reflectivity in Corrosion Research on Metals

Area of Science:

• Materials Science
• Surface Science
• Corrosion Science

Background:

• Neutron reflectivity (NR) is a powerful technique for analyzing thin films and interfaces.
• Its limitations include requirements for low surface roughness and high sample planarity.
• These are offset by the ability to detect light elements and isotopes, and accommodate bulky sample environments for in situ studies.

Purpose of the Study:

• To highlight the characteristics of NR for studying metal corrosion.
• To showcase its application in analyzing thin films, passive layers, and metal-surface interactions.
• To encourage broader adoption of NR in corrosion science.

Main Methods:

• Neutron reflectivity measurements.
• Characterization of chemical and morphological changes in thin films.
• In situ studies of corrosion processes.

Main Results:

• NR is suitable for studying films in the 3-100 nm range, including air-formed and passive films.
• It can investigate metal interactions with hydrogen and water.
• NR can track early-stage oxide growth and transitions like Cabrera-Mott to Wagner.

Conclusions:

• Neutron reflectivity is a versatile tool for corrosion science, particularly for thin film analysis.
• Its unique capabilities, including light element detection and in situ analysis, are valuable for understanding corrosion mechanisms.
• Further application of NR is encouraged to advance the field of corrosion science.