Coating of Nano-film Cr2O3 on Welded 304L Stainless Steel and Its Surface Resistance Properties
Keywords:Nano-film Cr2O3, Welded stainless steel, Oxidation, Surface resistance
This research presented the Cr2O3 coating and surface properties of welded stainless steel pipe grade 304L. For the welding, process, the 304L specimen was prepared with a single V-butt joint and welded by the tungsten inert gas (TIG) welding process. The weld quality was investigated by visual test (VT), penetrant test (PT) and radiographic test (RT), respectively. After that, the welded specimen was coated with colored-oxide film by chromic reduction. The structural phase and crystallite size of the coated film on welded 304L (C-304L) were analyzed by X-ray diffractometer (XRD) and calculated by Scherrer's equation. The atomic force microscope (AFM) was used for measuring the thickness of the Cr2O3 film. In addition, the surface properties such as hardness and electrical resistance of the coated specimens were tested by Vickers hardness tester and digital multi-meter. Finally, the corrosion resistance of specimens before and after surface coating was determined in extremely corrosive condition such as chlorinated sulfuric acid . The results showed that the C-304L has excellent surface resistance properties for erosion-corrosion applications.
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