Scratch: In order to prevent the accumulation of process lubricants or products and dirt, scratches and other rough surfaces of stainless steel pavilions must be mechanically cleaned.
Rust spot: Stainless steel kiosks are sometimes rusted on stainless steel products or equipment before or during production, which indicates that the surface is seriously polluted. The rust must be removed before the equipment is put into use. The thoroughly cleaned surface should be inspected by iron test or water test.
Floating iron powder or embedded iron: On the surface of stainless steel pavilions, free iron rusts and corrodes stainless steel pavilions. Therefore, it must be cleared. Floating powder can generally be removed with dust. Some have strong adhesion and must be treated with embedded iron. In the process of making stainless steel pavilion, there are many sources of iron besides dust on the surface of stainless steel, including cleaning with ordinary carbon steel wire brush and peening with sand, glass beads or other abrasives previously used in ordinary carbon steel, low alloy steel or cast iron castings, or grinding the aforementioned non-stainless steel products near the parts and equipment of stainless steel pavilion. If protective measures are not taken for stainless steel in the process of cutting or lifting, the steel wire rope, hanger and iron on the working table surface can easily be embedded or stained. Ordering requirements and post-production inspection can prevent and detect the existence of free iron. ASTM standard A380  prescribes a rust test method for inspecting iron or steel particles on stainless steel surfaces.
This method should be used when it is absolutely impossible for iron to exist. If the results are satisfactory, wash the surface with clean water or nitric acid until the dark blue disappears completely. As standard A380  points out, if the rust test solution can not be completely cleaned, it is not recommended to use this test method on the process surface of the equipment, that is, the direct contact surface used to produce human consumer goods. The simpler test method is to expose to water for 12 to 24 hours to check for rust spots. This test is not sensitive and time-consuming. These are tests, not cleaning methods. If iron is found, it must be cleaned up by chemical and electrochemical methods described later.
Dust: Stainless steel pavilions are usually placed in the position of dust, often with a lot of dust in the air, they continue to fall on the surface of the pavilion. We can use water or alkaline solution to remove dust falling on the surface of the pavilion. However, adherent dust needs to be cleaned up with high-pressure water or steam.
Residual adhesives: When tearing off tape and protective paper, some of the adhesives remain on the surface of stainless steel. If the adhesive is not hard enough, it can be removed with organic flux. However, when exposed to light and/or air, the adhesive hardens and forms the corrosion source of crevice corrosion. Then fine abrasives are needed for mechanical cleaning.
Welding spatter: The welding spatter of stainless steel Pavilion is closely related to the welding process. For example, there is no spatter in GTAM (gas shielded tungsten arc welding) or TIG (inert gas shielded tungsten arc welding). However, the improper use of GMAW (gas shielded metal arc welding) and FCAW (flux cored arc welding) will cause a lot of spatter. When this happens, the parameters must be adjusted. If the problem of welding spatter is to be solved, the splash inhibitor should be applied on each side of the joint before welding, so as to eliminate the adhesion of the splash. After welding, it is easy to clean up the splashproof agent and all kinds of splashes without damaging the surface or causing minor damage.