Metal corrosion can be active or inactive. Some objects may be corroded but stable, and therefore inactive; others may be actively corroding. Very few shiny metal surfaces will remain that way, corrosion will occur naturally as a way for the metal to get back into its organic form. Inactive corrosion occurs as a stable oxide layer, tarnish, or colour change that slowly forms on metal object and protects the underlying surface. This is also called a patina. They are desirable in some instances where is can provide protection and is used for aesthetic purposes. An example of this would be the Statue of Liberty, which is a copper statue that has a patina of green. Active corrosion causes a continuing loss of material from the object. Actions can be taken to help slow down the process and prevent further damages. Corrosion usually occurs due to environmental conditions, such as RH or pollutants. Depending on the type of metal of the object will determine how active corrosion appears. Iron usually appears with red, yellow, or orange dust, and if you closely examine the object you might even see what is called sweating or weeping, which is droplets on the metal surface. Sweating or weeping occurs where the RH of the environment is high (roughly around 55 per cent and higher).
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