Eagle Offers Surface Finishing Services
Stainless steel is often chosen for its aesthetic appearance, so make sure to specify the surface finish you need. The most common is the shiny, silvery finish manufacturers refer to as “bright”; alternatively, you can request a “pickled” or dull finish. Polishing and centerless grinding operations can be performed as secondary processes to produce desired RMS finishes as needed.
Produces a matte finish with various grit sizes. 60 / 100 / 180 / 220 / Glass Bead
Produces a high bright finish
Produces a high luster finish using grits from 180 to 640
Black Oxide Finish
Minimizes light reflection
Centerless Ground Finish
Commercially Clean & Capped
Thermocouple Clean & Capped
Passivation (Chemical Cleaning)
Treatment of stainless steels after fabrication with oxidizing chemicals known as chemical cleaning or passivation. If iron particles or other substances have become embedded in the surface during fabrication or polishing operations, they must be removed. Otherwise, these minute particles may promote discoloration, rusting, or even pitting. Besides dissolving such particles, the oxidizing action of the bath also tends to enhance corrosion resistance of stainless steels by fortifying the natural passive surface film.
This processing should be the final operation on a stainless steel part. It is generally done by immersing in a nitric or citric acid solution and then rinsing in clear deionized water and drying. If immersion of the stainless steel piece is impractical due to size, the acid solution may be applied with a suitable swab and removed by rinsing with water.
Nitric acid is recommended because it will dissolve any iron particles and leave the stainless steel unaffected. It is necessary that the surface of the steel be free of scale, heavy grease and oil if the chemical cleaning treatment is to be effective.