Colored Stainless Steel
Can you color stainless steel? If so, how?
Q. Can you color stainless steel? If so, how? N.L.
A. Yes, you can color stainless steel, but it is not a process that is typically performed in a plating shop. The basic process, which was developed by Inco (International Nickel) in the 1970s, is to immerse the stainless steel in a chromic and sulfuric acid solution at a temperature just below the boiling point of the solution. A thin layer of chrome oxide forms on the stainless steel, and by controlling the thickness of the oxide layer you can obtain colors that vary from bronze to blue, gold, purple and green. After treatment in this solution, the stainless steel is rinsed and given a cathodic treatment to harden the oxide layer. The layer can vary from 0.02 µm to 0.36 µm; the thicker the layer the darker the color. Most commonly, 304 grade stainless steel is used. The coating is reasonably robust but will scratch.
I am aware of one company that produces colored stainless steel, and you should be able to find others as well. Search the PFOnline.com database using the term “coloring stainless steel” to find an article about another recently developed process.
Some artists use a lacquer-based process for coloring stainless steel which is good for decorative purposes but will not stand up to heavy use.
Related Content
-
10 Ecoat Best Practices
Following this list of guidelines can help to increase the performance, cost effectiveness and quality for your ecoat operation.
-
Finishing Systems Provider Celebrates 150 Years, Looks to Future
From humble beginnings as an Indiana-based tin shop, Koch Finishing Systems has evolved into one of the most trusted finishing equipment providers in the industry.
-
Looking Back to Look Forward
Products Finishing reflects on a year of reporting on the surface finishing industry and looks ahead to what may be in store for 2023.