| 摘要 |
PROBLEM TO BE SOLVED: To satisfactorily smoothen the unevenness of the rough surface while utilizing the corrosiveness of a passivated film by forming a fluorine resin film on the passivated film of the uneven part of the rough surface generated upon pickling of the surface of a solution treated stainless steel. SOLUTION: A fluororesin is formed on the uneven part of the rough surface of the passivated film on the surface of a solid solution treated stainless steel tube. For example, the fluororesin film of the quantity which can cover the surface area of the tube 1 in the thickness of about 30μm is coated in the tube 1 by air spraying, predried at 90 deg.C for 30min, then baked at 280 deg.C for 30min in an electric furnace, and then water-cooled. This is rolled by a roller 4, the surface layer of the fluorine resin film is compressed, densified to thickness of 15μmRmax 0.2 and pencil hardness of 4H, smoothened, kneaded to the uneven part of the rough surface of the passivated film to be coupled by stronger force. |
