Is corten roofing waterproof?

Is corten roofing waterproof?
CORTEN steel is a weather-resistant construction steel that continues to form a barrier layer during weathering. This layer thus prevents further corrosion and develops characteristic earthy and warm tones.

The Corten steel and the rust
Although Corten steel is corrosion-resistant, it does not entirely resist rust. How long Corten steel lasts and how quickly the protective layer of rust forms depends on the climate and environment.
Most weathering steel types require cycles of wet/dry weather to develop and oxidize. Corten steel will patina or rust within six months of atmospheric exposure.
Providing corrosion resistance, Corten steel can last up to 100 years with protective rust.
Corten can be inhibited from rusting faster by using salt water or salt solutions mixed with vinegar and peroxide.

Corten steel roofing