Radiator core with passivation layer, preparation method of radiator core and radiator

The invention belongs to the technical field of radiator production, and discloses a preparation method of a radiator core with a passivation layer, according to the method, impurity ions introduced in the soldering flux welding process are reduced by combining a traditional aluminum soldering flux welding technology with multiple times of water washing, and then ion precipitation of a radiator is inhibited; the formed oxide layer has part of pores, so that the pores are filled by using the hole sealing agent compounded by various substances, ion precipitation of the radiator is further reduced, the conductivity of the radiator is reduced, and in addition, due to the fact that the radiator core body is welded by adopting a traditional brazing flux welding technology, the heat dissipation efficiency of the radiator is improved, and the service life of the radiator is prolonged. And the technical threshold in the production process is reduced. In addition, the invention further discloses a radiator core body an