The key to the atmospheric corrosion resistance of ASTM A 709 Gr.50W weathering steel is the protective oxide layer on the outside of the steel matrix, whose physical and chemical properties determine the atmospheric corrosion resistance.
ASTM A 709 Gr.50W weathering steel will also corrode in the atmosphere, and the oxide layer will thicken over time, but compared with ordinary carbon steel, the oxide layer generated on the surface of the steel weather resistant ASTM A 709 Gr.50W is more dense and cracked It has fewer defects, such as pores and ions, and has a certain ionic selectivity, which can block a series of corrosion-promoting factors, such as water vapor, chloride ions and acid sulfides in the atmosphere, reduce the penetration of corrosive substances into the substrate and further reduce the corrosion rate, increase the service life of ASTM A 709 Gr. 50W Weathering steel.
