Physical Cleaning Methods
Mechanical Wiping: Using a soft cloth, brush, or other tool dipped in a suitable amount of detergent or solvent, gently wipe the alumina ceramic surface to remove dust, stains, and loose impurities. For stubborn stains, use a tool with some friction but without scratching the ceramic surface, such as a nylon brush. For example, in a laboratory setting, if the alumina ceramic surface only has some light dust and fingerprints, gently wipe it with a clean non-woven cloth dampened with a small amount of ethanol.
High-Pressure Water Rinsing: Using a high-pressure water gun to impact the alumina ceramic surface effectively removes large pieces of dirt, oil, and loosely adhering impurities. This method is suitable for heavily contaminated surfaces where the ceramic product can withstand a certain amount of pressure, such as cleaning the outer surface of large alumina ceramic pipes or block ceramics. However, care must be taken to control the water pressure to avoid damaging the ceramic surface.
Ultrasonic Cleaning: Alumina ceramic products are placed in an ultrasonic cleaning tank containing cleaning fluid. High-frequency vibrations generated by an ultrasonic generator create countless tiny bubbles in the cleaning fluid. When these bubbles close, they generate strong shock waves, decomposing, emulsifying, and peeling off dirt, grease, particles, and other contaminants from the ceramic surface, thus achieving cleaning. Ultrasonic cleaning is particularly effective for cleaning alumina ceramic products with complex shapes, small holes, or crevices, reaching areas that are difficult to reach with conventional cleaning methods. For example, for alumina ceramic electronic components with fine internal structures, ultrasonic cleaning can effectively remove tiny impurities.
Chemical Cleaning Methods
Alkaline Washing: Commonly used alkaline solutions include sodium hydroxide, sodium carbonate, and ammonia. Alkaline washing can remove grease, organic matter, and some metal oxides from the surface of alumina ceramics. For example, immersing alumina ceramics in a sodium hydroxide solution of appropriate concentration for a period of time, followed by rinsing with clean water, can effectively remove surface oil. However, it is important to control the concentration of the solution and the soaking time during alkaline washing to avoid excessive corrosion of the ceramic surface. Pickling: Commonly used pickling solutions include nitric acid, hydrochloric acid, and hydrofluoric acid. Pickling can remove impurities such as rust, scale, and oxide scale from the surface of alumina ceramics, as well as stains that are difficult to remove with alkaline solutions. However, since alumina ceramics themselves have a certain degree of acid resistance, but the acid resistance varies depending on the crystal form and purity of the alumina ceramic, it is necessary to strictly control the acid concentration, temperature, and soaking time during pickling to prevent damage to the ceramic surface. For example, for alumina ceramics containing a small amount of metallic impurities, a dilute nitric acid solution can be used for soaking and cleaning to remove the surface metal oxides.
Organic Solvent Cleaning: Utilizing the good solubility of organic solvents such as ethanol, acetone, and toluene in grease and organic matter, this method cleans oil stains, adhesive residues, and other contaminants from the surface of alumina ceramics. Organic solvents evaporate quickly after cleaning and do not leave residues on the ceramic surface. However, most organic solvents are flammable and toxic, so safety precautions must be taken when using them, and operations must be carried out in a well-ventilated environment. For example, if there is adhesive residue on the surface of alumina ceramics, acetone can be used for wiping and cleaning.
