One is air pollution: many chemicals such as strong aci […]
One is air pollution: many chemicals such as strong acids, strong bases, salts and organic solvents are used in the production of plastic electroplating, which emits a lot of toxic and harmful gases during the operation. For example, hydrofluoric acid fumes in the air, and its vapor is very corrosive and toxic; when electroplating chromium, it emits a lot of chromium mist. Chromium compounds can cause skin ulcers, anemia, nephritis and neuritis and other diseases. And it can cause cancer and induce gene mutation.
The second is the pollution of water resources: the main source of zinc in the waste water of the plastic electroplating and metal processing industries is the towing liquid of electroplating or pickling. The contaminants are transferred to the rinsing water through the metal rinsing process. The pickling process involves first immersing the metal (zinc or copper) in strong acid to remove the oxides on the surface, and then immersing it in a brightener containing strong chromic acid for long-face treatment. The wastewater contains a lot of hydrochloric acid, zinc, copper and other heavy metal ions and organic brighteners, etc., which are relatively toxic, and some also contain carcinogenic, teratogenic, and mutagenic highly toxic substances, which are extremely harmful to humans.
The third is dust hazard: most hardware workpieces must be polished and mechanically polished before electroplating; in addition, in order to remove the slag, sand, oxide scale and other impurities on the surface of castings, forgings or parts after heat treatment, it is also necessary to perform Sandblasting. During these operations, there will be a lot of dust that may contain silicon, chromium, aluminum, iron, copper, and burlap. Fourth, there is a risk of blasting: In the production of plastic electroplating, organic solvents are often used to degreasing and degreasing workpieces. Commonly used organic solvents include gasoline, kerosene, acetone, benzene, trichloroethylene and carbon tetrachloride, etc.; in addition, they are also used The paint remover removes the old coating, and the coating is sealed with the finishing (sealing) paint. The paint remover contains a lot of dichloromethane and other organic solvents, and the finishing (sealing) paint also contains a variety of organic solvents. .Gasoline, kerosene, benzene and some other organic solvents have very low flash points and are very volatile in the air. When the mixture of vapor and air reaches the lower limit of blasting, fire and blasting will occur when it encounters ignition sources such as sparks.