Characterization of interference thin films grown on stainless steel surface by alternate pulse current in a sulphochromic solution

Abstract

The aim of this work was to characterize thin interference films grown on the surface of AISI 304 stainless steel for decorative purposes. Films were grown in a sulphochromic solution at room temperature by an alternating pulse current method. The morphology and chemical state of the elements in the films were investigated by field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), glow discharge optical emission spectrometry (GDOES), and infrared Fourier transform spectroscopy (FTIR). Depth-sensing indentation (DSI) experiments and wear abrasion tests were employed to assess the mechanical resistance of the films. The coloration process resulted in porous thin films which increased the surface roughness of the substrate. The interference films mainly consisted of hydrated chromium oxide containing iron. Increasing film thickness produced different colors and affected the mechanical properties of the coating-substrate system. Thicker films, such as those producing gold and green colors, were softer but more abrasion resistant.

The Potential Impact of Biofield Treatment on Physical, Structural and Mechanical Properties of Stainless Steel Powder

“…The absorption peaks observed at wavenumber 3786 and 1606 cm -1 (control) and 3759, 3450, and 1542 cm -1 (treated) were assigned to bonding vibration of water molecules due to moisture absorption by sample. Another peak observed at wavenumber 506 cm -1 in control and treated SS sample were due to Cr-O bond vibrations [32]. Peak found at wavenumber 1107 cm -1 (control) attributed to Fe-O-H bond vibrations, was completely diminished in treated SS.…”

“…Peak found at wavenumber 1107 cm -1 (control) attributed to Fe-O-H bond vibrations, was completely diminished in treated SS. It may be due to alteration in F-O-H bond at atomic level through biofield treatment [32]. Thus, it is hypothesized that biofield treatment may be acting at atomic level to cause these alteration.…”

Effects of Short-Term Laser Beam Heating on the Absorptivity of Steel Sheets

“…After heating at 650 • C for 7 min, the surface turned blue and no change in the oxide layer thickness was observed for up to 10 min. That blue color was determined to be 130 nm to 140 nm thick [9]. These annealing colors can also be used for controlled surface coloring (e.g., [10]).…”

Influence of Weld Preparation Procedure and Heat Tinting on Sulfide Stress Corrosion Cracking of Duplex Stainless Steel

“…[5][6] Increased temperature during welding can generate a heat-tinted oxide scale on the steel surface in the HAZ, which is influenced by various parameters such as exposure time, steel composition, surface finish, and oxygen content in the surrounding atmosphere (effectiveness of backing gas). The thickness of the heat-tinted oxide layer (30 nm to 440 nm) [7][8][9] is significantly greater than that of the transparent passive layer (2 nm to 5 nm) 10-12 on stainless steels and typically CORROSION-Vol. 71, No.…”

“…15,20 However, most studies on heat-tinted oxide formation have been performed on austenitic stainless steels. 7,9,15,[20][21] Recent work on DSS has reported a Mn-rich oxide film. 8,14 In previous research, 22 heat tinting was shown to have a significant effect on the localized corrosion and cracking resistance of 316L (UNS S31603) (1) stainless steel cladding in sour environments.…”