Chemical coloring on stainless steel by ultrasonic irradiation

Abstract

To solve the problems of high temperature and non-uniformity of coloring on stainless steel, a new chemical coloring process, applying ultrasonic irradiation to the traditional chemical coloring process, was developed in this paper. The effects of ultrasonic frequency and power density (sound intensity) on chemical coloring on stainless steel were studied. The uniformity of morphology and colors was observed with the help of polarizing microscope and scanning electron microscopy (SEM), and the surface compositions were characterized by X-ray photoelectric spectroscopy (XPS), meanwhile, the wear resistance and the corrosion resistance were investigated, and the effect mechanism of ultrasonic irradiation on chemical coloring was discussed. These results show that in the process of chemical coloring on stainless steel by ultrasonic irradiation, the film composition is the same as the traditional chemical coloring, and this method can significantly enhance the uniformity, the wear and corrosion resistances of the color film and accelerate the coloring rate which makes the coloring temperature reduced to 40°C. The effects of ultrasonic irradiation on the chemical coloring can be attributed to the coloring rate accelerated and the coloring temperature reduced by thermal-effect, the uniformity of coloring film improved by dispersion-effect, and the wear and corrosion resistances of coloring film enhanced by cavitation-effect. Ultrasonic irradiation not only has an extensive application prospect for chemical coloring on stainless steel but also provides an valuable reference for other chemical coloring.

Thermal Stability of Chromium-Iron Oxidation Mixture Cermet-Based Solar Selective Absorbing Coatings

“…The potential corresponding to point C is the coloring potential(E C ), and the point D is the end point of coloring, ∆E is the chemical potential, expressed as E B − E C = ∆E. The color of stainless steel is changed from brown → blue → yellow → blue-black → black → fuchsia → prasinous [21]. Each color corresponds to a different coloring potential when the coloring liquid composition and the substrate composition are constant [22].…”

“…Chemical coloring is a process for the preparation of color stainless steel [21]. A variety of metal ceramic functional coatings, such as corrosion resistance, wear resistance, heat resistance, oxidation resistance and so on [22], can be prepared on the surface of stainless steel by adding current.…”

Mechanism for Control of Laser‐Induced Stainless Steel Oxidation

“…Stainless steels are among the most widely used alloys in a variety of applications such as the automobile, pharmaceuticals, food, DOI: 10.1002/admi.202300991 marine, and architectural fields due to their low cost, excellent mechanical strength, ease of fabrication, surface luster, and resistance to corrosion. [1,2] In particular, their use is increasing in architectural and decorative applications owing to their weathering, resistance to general corrosion, and localized corrosion. [3] This originates from the protective passive chromium layer formed on the steel surface.…”

Coloration of stainless-steel surfaces using magnetic abrasive finishing

“…Because of the wide range of industrial applications, numerous research studies have focused on structural coloration of metallic surfaces created by micro/nano-scale periodic surface structures (invoking the phenomenon of diffraction), thin coatings of oxides (optical interference), and sub-wavelength-scale surface structures (plasmonic resonance) [4][5][6] . In particular, structural coloration of stainless-steel surfaces has been accomplished using lasers [7][8][9] as well as by chemical [10][11][12] and thermal 13 means. Periodic nanostructures and thin films created on the processed stainless-steel surfaces result in the display of iridescent colors.…”