Steel formwork derusting using mechanical method and chemical method, manual derusting method three:
        Mechanical rust: blasting steel template (Pao Guang) machine, polishing machine, grinder with wire brush and other mechanical equipment. General industry does not have the conditions of sand concrete. After removing the template grinder is too smooth and is not recommended. Angle grinder with a wire brush after removing the template has a certain texture, good effect.
Manual derusting: bridge plate with steel wire brush, emery cloth, grinding wheel broken tools such as artificial derusting. Obviously, the low efficiency of artificial derusting.
        Chemical cleaning: rust liquid acid and the chemical reaction of rust formation can dissolve salt in water, the template wash away the rust, also known as the pickling. Its advantage is derusting effect is good, high efficiency, the disadvantage is easy to be corroded and pickling to the metal surface completely clean. If the cleaning is not clean, the residual salt template will seriously affect the adhesion of the film.