This time, we will look into “Alumite.”
In Japan, many people believe that “Anodizing = Alumite.”
Why is this misconception so widespread?
We will unravel that mystery.
What is Alumite?
It is a type of anodizing.
It is an artificial oxide coating specifically for aluminum.
When exposed to oxygen, metals like aluminum, stainless steel, and titanium form an oxide coating on their surface, protecting themselves from corrosion.
However, aluminum’s natural oxide coating is thin and unstable, leaving it vulnerable to corrosion in harsh environments.
To solve this, anodizing—an electrochemical process—is applied to create a strong, stable coating; this is Alumite.
Its surface features regular, microscopic pores, which can absorb dyes to allow for custom coloring.
motorockmanStainless steel and titanium form an exceptionally strong natural oxide coating. For this reason, anodizing titanium is done solely for decorative purposes.
The Truth: Anodizing $\neq$ Alumite
Originally, Alumite is just one type of anodizing specifically for aluminum. Therefore, other forms of anodizing exist.
Some people refer to the anodizing of titanium or magnesium as “Alumite,” but that is completely incorrect! Furthermore, it is a term unique to Japan.
The Institute of Physical and Chemical Research (RIKEN) developed Japan’s first practical anodizing technology for aluminum.
RIKEN named this technology “Alumite” and registered it as a trademark.
Established “Riken Alumite Co., Ltd.”
Alumite kettles and pots spread to households.
The term “Alumite” became widely used as a generic term for anodizing.
As a result, the trademark “Alumite” spread and became well-known ahead of the actual name of the process.
This is the same phenomenon as SHARP’s “Shaa-pen” (mechanical pencil), which became the origin of the word “sharp pencil” in Japan, and TOTO’s “Washlet,” which became a synonym for electronic toilet seats with a warm-water bidet.
“Alumite” is not understood overseas.
According to Google Translate:
Anodization
Anodized aluminum
In other words, the word “Alumite” does not exist in English-speaking countries.
That being said, it is often understood by companies in China and Taiwan that do business with Japan.
motorockmanBecause “Alumite” has become so widely used, the Japan Patent Office now recognizes it as a common name for the anodization of aluminum rather than a specific trademark. Note that the anodization of metals other than aluminum is still not referred to as Alumite.
