The Reason why you Need To Passivate Steel After Electropolishing
One of the main reason why you will need to passivate parts and components of stainless steel is to maximize the corrosion resistance. If the process is carried out in the right direction, it brings out satisfactory results. When you carry out the process in the wrong way, the result is corrosion. Passivation is a post-fabrication process aimed at maximizing the natural corrosion resistance of the kind of steel used to create a particular item. There is always a need to carry out this process after parts are fabricated by machining. Without passivation process some contaminants may be transported to the stainless steel from the shop where the fabrication is taking place.
The efficiency of the fabricated steel is usually reduced, if the pollutants are not stopped from affecting it. That may end up causing corrosive attack on the steel. That may cause some places on the machined parts. If you fail to protect the steel the most likely thing to happen is that some particles will stick to the iron. Even though the metal may appear shiny and clean some iron particles may cause corrosion after exposure to the air.
Something else that can happen to the stainless steel if exposed is to mix with sulfur particles. When the parts of the metal are not protected well, they will mix with sulfur particles in the air, and that will be the starting of corrosion and rusting. With passivation process you will be sure that you have protected your metal pieces from corrosion. The best way to ensure that your fabricated metal is free from corrosion is to ensure that you also ensure you have taken it through passivation process. If you want to be sure you have a successful passivation process, you must make sure that you clean the metal thoroughly to remove grease and any other debris.
You must make sure that cleaning takes place before you start the process of passivation. If you avoid the cleaning process, the fat and the acid react to form bubbles on the surface that prevent the passivation process. That means the metal is not protected. As a result the metal will rust.
There are numerous ways of doing passivation, and the one used depends on the manufacturer. It will be good if you know some common mistakes that you need to avoid during the passivation of your metal. You should know that you do not pass your metal through passivation if it has been curburized. Such metals are likely to get corrosion when they are through passivation. Therefore if you want to be sure that your process will be successful, you must not do anything else to the metal after machining. Avoid allowing the metal to be contaminated before you carry out the passivation process. That will make it possible to avoid corrosion.