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Surface Preparation
Published in Karan Sotoodeh, Coating Application for Piping, Valves and Actuators in Offshore Oil and Gas Industry, 2023
Sandpaper is another hand tool, which consists of a sheet of cloth or paper with abrasive materials attached or glued to its surface. Sandpaper, like a wire brush, can be used to remove loose rust, mill scale and paint from a metal surface without making a surface roughness or profile. Figure 2.51 illustrates a hand-held sandpaper tool being used to polish the rough surfaces of a metal. An alternative for hand and power tool cleaning, SSPC–SP2 and SP3, respectively, is brush-off grade blasting (SSPC–SP7). SSPC–SP7, which is equivalent to NACE 4 and ISO Sa 1, removes rust scale, loose mill scale, loose rust and loose coatings, leaving tightly bonded mill scale, rust and previous coatings. As explained above, SP 7 is called brush-off or sweep blast cleaning. Sweep blast cleaning removes 100% of the loosely adherent contaminants, but 100% of tightly adherent materials, stains, streaks and shadows remain on the metal surface. This is an ideal method for removing oxides and/or loose and peeling coatings from galvanized metal. The results are comparable to those achieved through chipping, scraping and wire brushing.
Introduction
Published in E. Higgins Thomas, Hazardous Waste Minimization Handbook, 2018
Other minerals can be recovered by burning solid waste streams. The gold from scrap circuit boards can be recovered by burning the resins. By burning scrap sandpaper, sandpaper grit can be recovered and recycled.
Biomaterials and Surface Modification
Published in Mohammad E. Khosroshahi, Applications of Biophotonics and Nanobiomaterials in Biomedical Engineering, 2017
Sandpaper or glass paper are generic names given to coated abrasive that consists of sheets of paper or cloth with abrasive material glued to one face. Sandpaper is produced in a range of grit sizes, and is used to remove material from surfaces, either to make them smoother to remove a layer of material (such as old paint layer), or sometimes to make the surface rougher (for example, making grooves on the surface). It is common to use the names: aluminium oxide paper, or silicon carbide paper. Abrasive blasting is the operation of forcibly propelling a stream of abrasive material against a surface under high pressure to smooth a rough surface, roughen a smooth surface, shape a surface, or remove surface contaminants. A pressurized fluid, typically compressed air, or a centrifugal wheel is used to propel the blasting material. Clearly, this mechanical methods cannot be suitable for a precise surface modification largely due to random size and direction of grooves and pits created by grits or sands on the surface, and also inclusion of impurities.
Tensile test analysis of corroded cleaned aged steel specimens
Published in Corrosion Engineering, Science and Technology, 2019
Y. Garbatov, S. Saad-Eldeen, C. Guedes Soares, J. Parunov, J. Kodvanj
Each sandpaper is defined by a grit number, which reflects the size of the abrasive materials on the sandpaper, i.e. the lower number means the grit is coarser. The grits are ranged according to FEPA [24] from an extra coarse one P12 to ultra-fine one P2500. For the tested specimens with the sandpaper cleaning technique, a grit P40 and P50 are used, which are of the category 40 and 50 according to CAMI [25]. In order to ensure a good surface cleaning, all specimens have been polished with very fine grit.