Glass beads used in the cleaning of stainless steel
Stainless steel, to a large extent, makes us look very beautiful. You think it may not need to be cleaned, but in fact it is not. To a large extent, it needs to be cleaned. Many times, glass beads are used for cleaning. , During the manufacturing process of stainless steel equipment, there will be performance damage, defects and some substances that affect the surface, such as: dust, floating iron powder or embedded iron, thermal tempering color and other oxide layers, rust spots, grinding burrs, welding arc marks, Welding spatter, flux, welding defects, oil and grease, residual adhesive and paint, chalk and marking pen marks, etc. Most of them are neglected or done poorly because they ignore their harmful effects. This requires us to make judgments in this regard and to do what we like. Stainless steel, we have to clean up the following aspects: 1, floating iron powder or embedded iron On any surface, free iron will rust and cause corrosion of stainless steel. Therefore, it must be cleared. The floating powder can generally be removed together with the dust. Some have strong adhesion and must be treated with embedded iron. In addition to dust, there are many sources of iron on the surface, including cleaning with ordinary carbon steel wire brushes and shot peening with sand, glass beads or other abrasives that have been used on carbon steel, low alloy steel or cast iron parts, or Grind the aforementioned non-stainless steel products near stainless steel parts and equipment. 2. Dust The production is often carried out in dusty venues. There are often many dusts in the air, which constantly fall on the surface of the equipment. They can be removed with water or alkaline solution. However, adhesive dust requires high-pressure water or steam to clean up. 3. Scratches In order to prevent the accumulation of process lubricant or products and/or dirt, scratches and other rough surfaces must be mechanically cleaned. 4. Thermal tempering color and other oxide layers. If stainless steel is heated to a certain high temperature in the air during welding or grinding, chromium oxide thermal tempering color will appear on both sides of the weld, the lower surface and the bottom of the weld. . The heat-tempered color is thinner than the oxide protective film and is clearly visible. The color is determined by the thickness, which can be iridescent, blue, purple to light yellow and brown. Thicker oxides are generally black. In this case, not only should the thermal tempering color and other oxide layers be eliminated, but also the chromium-depleted metal layer under them should be cleaned. 5. Welding arc strike marks When the welder strikes the arc on the metal surface, it will cause surface roughness defects. The protective film is damaged, leaving a potential source of corrosion. The welder should start the arc on the welded bead or on the side of the weld joint. Then melt the pilot arc trace into the weld. 6. Flux” The welding process using flux includes manual welding, flux-cored arc welding and submerged arc welding. These welding processes will leave small flux particles on the surface, which cannot be removed by ordinary cleaning methods. These particles will be the source of crevice corrosion, and mechanical cleaning methods must be used to remove these residual fluxes. During the cleaning process, we need to understand, what is the object we want to clean, how we should clean up in this area, we need to research beforehand to understand this knowledge, the impact of these pollutants and oil and grease The impact is similar. It is recommended to use a clean brush and clean water or alkaline detergent for washing, or use high-pressure water or steam to rinse. There are many ways, and the key still needs us to understand.