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Passivation Treatments improve the surface condition of stainless steel by dissolving iron that may have imbedded in the surface during machining. If left untreated the iron can corrode and will give the appearance of rust spots on the stainless steel.
Nitric Acid Passivation
This is a process by which stainless steel components are submersed in a solution of nitric acid without oxidizing salts. The nitric acid will dissolve the imbedded iron and restore the original corrosion resistant surface by forming a thin transparent oxide film.
Citric Acid Passivation
Many industries such as aerospace and medical device are changing to the use of citric passivation as a method of removing free iron from the surface of their products. There are several benefits of citric acid passivation over nitric acid passivation for our customers that require this passivation service.
MEDCOAT 2000 (TM)
MEDCOAT 2000 (TM) was developed by The Electrolizing Corporation of Ohio specifically to meet the needs of the medical device industry. This process has been tested by the North American Science Associates and has been shown to improve the performance and service life of medical devices. The coating can be applied to most ferrous and some nonferrous metals but is most commonally used with stainless steel.
Anodized Aluminum
Many metals are structurally weakened by the oxidation process, but not aluminum. Aluminum can actually be made stronger and more durable through a process called 'anodizing'. The anodized aluminum layer is grown by passing a direct electric current through an electrolytic solution, with the aluminum object serving as the positive electrode. The current releases hydrogen at the negative electrode and oxygen at the surface of the aluminum, causing the surface of the aluminum to oxidize (essentially rust). The oxidized aluminum forms a strong coating as it replaces the original aluminum on the surface. The result is an extremely hard substance called anodized aluminum.
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