Stain stainless steel black

Not always a silvery stainless steel surface is desired. Then there are several ways to color the stainless steel. Which of the methods is used depends on the individual requirements. We will then show you different ways to color stainless steel.

Various processes for dyeing stainless steel

It does not always have to be a silvery shiny or dull stainless steel surface. Most stainless steel alloys can also be colored. This does not mean the painting of stainless steel, but the actual coloring of the stainless steel surface. There are various techniques available for stainless steel:

  • the black oxidation of stainless steel (often referred to as the anodizing but also the burnishing of stainless steel)
  • the Inco process (the oxidation of the chrome layer)
  • Burning off used oil or linseed oil on the metal surface (similar or instead of burnishing)

The black oxidation of stainless steel for dyeing

The black oxidation of stainless steel corresponds to the burnishing of steel or the anodization of aluminum, which is why the process is often referred to as the blackening or anodizing of stainless steel. Although the two latter names are technically incorrect, they have become colloquially prevalent due to their proximity to the described methods.

When blackening steel in the burnishing solution, oxidation of iron atoms takes place. This controlled iron oxidation is also known as Edelrost. This eliminates this possibility for stainless steel, because the high proportion of chromium here no iron oxide, so rust, arise. However, in order to process a stainless steel similarly, nickel atoms are oxidized on the metal surface in the solution for black oxidation.

This assumes, however, that the stainless steel contains a nickel content of at least seven percent in its alloy. In addition, these nickel oxide layers are not resistant to acids. Also not against slightly acidic solutions, but against alkaline solutions. All these circumstances mean that even this procedure can not always be applied.

Burning off linseed oil or waste oil on stainless steel

The burning off of linseed oil or waste oil was a procedure that was often used earlier. The stainless steel is massively heated and then quenched in waste oil or linseed oil. It can also be painted with oil before heating.

This process must be repeated again and again. However, as in the case of black oxidation, only a black or brown color is achieved here. This layer is easy to polish off. In addition, the stainless steel properties are influenced by the heating.

The Inco process for coloring in different colors

In recent years, a method has been developed, which has been known for a long time. However, methods have yet to be developed to appropriately stabilize and harden this coating. This is the Inco process, which is offered under different names (depending on the manufacturer).

Simplified speaking, the chromium in stainless steel on the surface is oxidized. It then forms an interference layer which is comparable to an oil film on water or the soap bubble rinse. A double reflection of the light, which is also influenced by the layer thickness, creates an interference. That is, depending on these properties mentioned creates the impression of different colorations.

Inco process for decor or for technical applications

After chromium oxidation, this interference layer is additionally cured and is resistant to alkalis and acids. Because different colors can be adjusted, but also because of the excellent properties of the chromium oxidation, the process is used in the decorative area, but also for technical applications.

Tips & Tricks

Not only by chemical processes can a stainless steel surface be refined. So you can also grind or polish stainless steel. As often as stainless steel is brushed.

Video Board: Stainless Black on Stainless Steel