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What is the patina formation process of Corten steel?

At first, the Corten steel begins to rust in the same fashion as ordinary mild steel when exposed to wet and dry conditions. corten steel supplier:www.zheruisteel.com
At the time passes, the rust layer transforms into a patina, and the color changes from fresh, newly developed orange-brown, to light or dark brown. Email:annie@zheruisteel.com
The speed of change and the final color of the steel depend on the atmospheric conditions of a site and the level of pollution.Frequent cycles of wet and dry conditions will also speed up oxidation.
The entire oxidation process usually takes two to six years.If conditions are consistently wet or dry , a uniform patina will not form. For this reason, weathering steels should not be used indoors.