CAGE CODE: 97F93
(973) 746-1200This process is used on all types of stainless steel. It removes oil, grease and metal particles, leaving the part clean and resistant to oxidation. After stainless steel parts have been manufactured, an important additional step needs to be taken in order to make the part rust-resistant. This vital next step is called passivation which keeps the metal from corroding.
Passivation is a process which enhances the corrosion resistance of metal components. During the process, parts are cleaned, then immersed in an acidic passivating bath.
After a stainless steel part has been made, it needs to undergo the process of passivation in order to improve the appearance and functionality of the part. The process of manufacturing the part can leave grease and other substances on the part’s surface. These substances can form iron which slows the formation of the oxide film that is needed in order to protect the stainless steel part from corrosion. After passivation, the surface of the metal is clear of imperfections and ready for priming and painting.
The process happens in two steps. The first step is to thoroughly clean the part from any substances introduced to its surface in the manufacturing process. This step is vital to the process since contamination can cause damage to the metal.
The second step is for the steel to be immersed in a passivating bath. Three different approaches can be used for the acidic bath:
The passivating bath works to remove iron particles on the surface of the metal and grow a protective film over the part. The protective film is a passive oxide layer that gives the metal a rust-resistant quality that improves the parts appearance and functionality. After being passivated the parts can be tested to ensure they meet all requirements. Typically, this testing can be done by salt spray, water immersion or humidity.