Degreasing by immersion into a cold solvent

pm523Degreasing by immersion into a cold solvent

Degreasing by immersion into a cold solvent. Degreasing by immersion into a cold solvent, is the most frequently used method in the country, because it does not require the installation of special apparatus and heating and ventilation systems. The greasy parts are immersed in an enamel tub with a solvent, preferably with a solvent "PT” and allows, to let the oil or grease layer soften for a few minutes. Then the remaining contamination is washed off with a brush and rinsed in a clean solvent while boiled in a second tub. After air drying the parts, preferably with a stream of warm air under the hood, they must be maintained immediately, otherwise they will corrode quickly due to the high purity of the metal surface. This method is not suitable for products connected with rubber, plastics and for partially varnished products, because chlorinated solvents are very aggressive and soften or dissolve organic materials and coatings. Sometimes corrosion of steel products can be encountered during degreasing. This phenomenon varies in intensity depending on the type of solvent used, its stability and the content of hydrogen chloride in it. In order to protect against corrosion, an alkaline stabilizer was added to the chlorinated solvent. The research have shown, that this additive significantly inhibits the corrosion process. Found, that particularly unfavorable conditions then exist, when water is introduced into the solvent. The stabilizer completely protects the steel surfaces from corrosion, while the protection of the metal in the water-containing solvent is weaker. Nevertheless, for practical purposes even the presence of water in the stabilized chlorinated solvent is irrelevant, when the duration of degreasing does not exceed a few minutes.