The cleaning of hot-dip galvanized screw residual oil is mainly for the cooling oil attached to the surface of the fastener during cold heading or cutting, and the residual oil on the surface of the fastener after quenching in the heat treatment oil.

①Alkaline cleaning method

Simple alkaline water cleaning is a direct heating or indirect heating cleaning tank, and the cleaning solution is a 3% to 10% N2CO3 or NaOH aqueous solution.

②Metal cleaning agent cleaning method

In order to overcome the shortcomings of the alkaline water cleaning method and improve the cleaning effect, a special metal cleaning agent can be used at present. 20min, then rinsed with hot water, and then dehydrated with a dehydrator. Can be added to the washing machine for use.

③Organic solvent cleaning method

Using organic solvents such as trichloroethane and trichloroethylene to clean, the cleaning effect is good. When quenched fasteners are cleaned by immersion or spray under normal pressure, the volatilization and splash of organic solvents pollute the environment.

④ Combustion degreasing method

Cold heading or machined fasteners need to be cleaned of oil from the surface before entering the heat treatment process. To this end, the fasteners can be heated to 350 ℃ ~ 400 ℃ in the degreasing furnace to vaporize or burn the oil, so as to achieve the purpose of removing oil from the fasteners or the effect of removing phosphorus from the surface.

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