Zinc Rich Paint (ZRP) is one of the representative cathodic anticorrosion technologies. It indicates that metal zinc in coated film is eluted in a sacrificial manner when subjected to corrosion as is the case with zinc coated steel and thereby electrons are transferred to steel material to stablize it.

However, in the high corrosion environment such as coastal areas, there is the fault that durability comes to have a short by flying particles of sea salt so that consumption of the zinc becomes intense.

It is often observed that the heavy-duty anticorrosion effect by use of Zinc Rich Paint is ineffective in the three major corrosion regions of Okinawa Prefecture, Kashima in Ibaragi Prefecture and Tomakomai in Hokkaido.

In the needle-shaped conductive titanium oxide with UV rays from sunlight received, electrons are generated. By transfer of these electrons to metal, the electric potential (corrosion) of the metal itself shifts to "less noble potential" (anticorrosion). Even if there is salt, no rust will be formed on the metal.
It is so-called "Cathodic photo-protection" to prevent metal from rust formation by the light.