It should be silicate or the like. Ethylene glycol antifreeze will cause corrosion of the cooling system material during long-term operation. The corrosion medium is water and ethylene glycol. Therefore, corrosion inhibitors must be added to antifreeze. Moreover, the added corrosion inhibitor is required to have the characteristics of low dosage and good corrosion inhibition effect. Corrosion inhibitors can be divided into two categories: one is inorganic compound corrosion inhibitors, which include metasilicate, phosphate, tungstate, borate, nitrite, molybdate, benzoate, etc. Judging from antifreeze patents in recent years, at least half of the literature contains silicates as corrosion inhibitor components.