Surface treatment

Pickling, in contrast to electropolishing, produces foggy surface with reduced gloss.The surface becomes completely clean, and a new natural oxide layer is formed eventually making it more resistant to corrosion than before.It can also be used to improve functional properties such as anti-reflection and smoothness of the surface.

The path of the light changes depending on the direction of light incidence or the direction of view, creating a subtle change in the color tone.This gives the surface a depth of color that cannot be achieved by painting.The color is generated by an ultra-thin, transparent oxide coating, so you can see the the surface of the base metal. It is possible to produce colored surfaces that take advantage of the polishings applied to the base metal surface, such as hairline and mirror finishes.

In addition, unlike coloring with dyes or pigments, this coating does not fade with light at all and has excellent weather resistance.It also has good adhesion and can be bent and lightly stamped after coloring.In addition, its antibacterial properties make it effective for use in hospital handrails and interiors.

A hard film treatment is performed after coloring to enhance wear and corrosion resistance.It is also possible to add multi-colored patterns by combining screen printing and etching.Please note that although hexavalent chromium is used in the treatment process, it does not remain on the surface of the final product.

A transparent oxide layer with a thickness of about 10-300 nm is grew on the surface of stainless steel by chemical oxidation, which changes the surface to vivid color.Although the oxide layer itself is colorless and transparent, white light including the light of various wavelengths is reflected on the surface, and the light reflected on the surface of the oxide layer and the light reflected at the interface between the metal and the oxide layer cause an interfering effect, making the light with an intensified wavelength appears as a color.

Since the intensity of the wavelength is determined by the thickness of the oxide layer, the desired color can be achieved by precisely controlling the thickness.The principle of coloration is the same as that of a rainbow caused by a thin transparent film of soap bubbles and a rainbow caused by a thin layer of oil and fat floating on the surface of the water.With our continuous coil coloring line technology, it is also possible to color coils.