Corrosion Behavior of Monel 400 in Atmosphere
Corrosion of alloy 400 is negligible in all types of atmospheres, although a thin gray-green patina will develop. In sulfurous atmospheres, a brown patina may be produced. Because of its low corrosion rate and pleasing patina, alloy 400 has been used for architectural service, such as roofs, gutters, and flashings, and for outdoor sculpture.
Corrosion Behavior of Monel 400 in Freshwater
Monel 400 has very low corrosion rates and are used in freshwater systems for valve seats and other fittings.