Hidden Frame Corten Steel Unitized Curtain Wall Profile

hidden frame corten steel unitized curtain wall profile

The rust layers formed on most ordinary structural steels are porous and detach from the metal surface after a certain time, and the corrosion cycle commences again. Hence, the rusting rate progresses as a series of incremental curves approximating to a straight line, the slope of which depends on the aggressiveness of the environment.

The color changes during the oxidation process: from an initial orange color to a brown-reddish as the patina stabilizes. Under normal weather conditions, the oxidation process is completed in 18-36 months, with a thickness decrease of 0.05 mm.

Research has shown repeated wet-dry cycling is essential to form the optimum dense and adherent rust layer, with rainwater washing the steel surface well, accumulated moisture draining easily, and a fast drying action.

In industrial areas, the patina appears in a shorter time and with a darker tone; this is due to the pollutant agents and the lower presence of oxygen in comparison with the rural areas.