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Hiromoto Lab
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The lab studies how surface treatment of magnesium alloys can suppress their corrosion.
AboutAbout the lab
Matching a metal's surface to where it will be used.
The Hiromoto Lab studies how to control the corrosion of magnesium alloys through surface treatment.
Magnesium alloys are expected to serve as lightweight structural materials for transport equipment such as automobiles, and they are also attracting attention as materials for fixing bone and as stents for blood vessels.
Aiming for coatings whose corrosion resistance and functions suit the environment of use, the lab is developing low-environmental-impact oxide coatings for structural materials and composite coatings of polymer and calcium phosphate for biomedical use.
The lab belongs to a field run in collaboration with the National Institute for Materials Science (NIMS), and its research is conducted under a cooperative graduate school program.
Key terms
- Magnesium alloy
- An alloy that is especially light among practical metals and also has the property of dissolving in the body
- Corrosion resistance
- The property of resisting rusting or dissolving through reactions with surrounding chemical components
- Calcium phosphate
- The main component of bones and teeth, a substance used as a material that is readily compatible with living tissue
ResearchResearch themes
The Hiromoto Lab forms coatings on the surfaces of magnesium alloys by aqueous solution treatment and investigates their properties. The work includes characterization of the coatings by electron microscopy and X-ray diffraction, evaluation of corrosion by immersion tests and electrochemical measurements, and evaluation of biocompatibility by cell culture tests.
*Illustrative imageCoating metals that dissolve inside the body
Magnesium alloys dissolve gradually in the body, so they are expected to be used for bone fixation devices and similar applications. To adjust the dissolution rate, the lab covers them with an apatite coating, which is close to the components of bone, and investigates how they corrode and degrade.
*Illustrative imageCoatings that prevent rust, and where rust begins
The lab is developing a method that uses electricity to form coatings that store rust inhibitors between their layers. It also uses electron microscopy to observe how localized rust on steel begins from slip in the metal, in order to find clues for preventing rust.
MembersFaculty
- Visiting ProfessorShoko Hiromoto
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “CSIRO ScienceImage 2893 Crystalised magnesium” Mark Fergus, CSIRO / CC BY 3.0 (cropped)
- Coating metals that dissolve inside the body: “Femur-fractura-nail-artificial-bone” Fry72 Karel Frydrýšek / CC BY-SA 4.0 (cropped)
- Coatings that prevent rust, and where rust begins: “Rust Pits in surface of Steel Water Pipe(GN04591A)” State Government Photographer / CC0 (cropped)
- Related lab (国吉研究室): “Polycrystalline silicon rod” Warut Roonguthai / CC BY-SA 3.0 (cropped)
- Related lab (川岸研究室): “Jet engine turbine” Dtom / Public domain (cropped)
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