Hokkaido University Research Profiles

Nanotechnology / Materials

Development of Innovative Anodized Aluminum and Their Functions

When the surface changes, everything changes.

We will introduce our research on the development of superior properties and new functions of aluminum by innovation of anodizing, which is an extremely well-known corrosion-resistant passive coating for aluminum.

Content of research

Anodic oxide film is an artificial passive film formed on the surface of aluminum, and was developed in Japan about 100 years ago. There are many anodized aluminum products around us, but our research group is reviewing the chemical substances and formation methods (anodic oxidation) used to form anodized aluminum surfaces from the ground up, and we try to develop a new anodizing method that exhibits superior properties and innovative functions. Specifically, we are developing anodized aluminum with highly ordered nanostructures, hard anodized aluminum with a Vickers hardness of Hv = 600 or higher, anodized aluminum with high corrosion resistance in acid, base, and chloride environments, and anodized aluminum that shines beautifully by producing luminescence and structural colors.

Potential for social implementation

  • ・As a nanotechnology that utilizes fine periodic structures
  • ・As an aluminum surface treatment that creates new functions
  • ・As an aluminum surface treatment with high corrosion resistance
  • ・As an aluminum surface treatment with a variety of decorative properties

Appealing points to industry and local governments

Whether or not a material can be used in society depends on the properties of its surface. For example, no matter how excellent a material is, if it corrodes easily, it cannot be used in society. We are working on research to control the surface and develop new functions, so please feel free to contact us.