Figuring Out Polishing
Why is it Important to Passivate after Electropolishing
The main reason why you need to passivate parts and machine components, is to enhance their corrosion resistance. When the process is done successfully it brings out satisfactory performance. Poor practice results in corrosion. The process of passivation is a post-fabrication method of maximizing the inherent corrosion resistance of the stainless steel from which the workpiece was made. It is essential to carry out the process of passivation after the elements are manufactured by machining. Without passivation process some contaminants may be transported to the stainless steel from the shop where the fabrication is taking place.
When the contaminants are not removed from the fabricated steel, they reduce its effectiveness. That can cause some corrosion to the part. That may cause some places on the machined parts. It is possible to have some particles from the shop dust adhering to the stainless steel if it is protected. Although the piece of metal may seem clean and bright, that can soon change after exposing it to the atmosphere.
At the same time if the steel is not protected it can combine 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. Passivation is an important process that allows that corrosion does not take place. Therefore if you want to be sure that your fabricated metal is free from corrosion, you have to make sure you also take through passivation process. To ensure that you carry out a successful method of passivation, you must make sure you clean all the grease and other shop debris from the metal before you carry out the process.
You must make sure that cleaning takes place before you start the process of passivation. If you happen to skip the cleaning process, the acid the and the grease will form bubbles on top of the metal and passivation will not take place. That means the metal is not protected. That is what will cause corrosion later.
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 the process to be successful you have to be sure you have not done anything else to the metal after machining. Avoid any form of contamination after fabrication so that the process will be successful. that way you can be sure you have a corrosion free metal.