Phosphorus-free graphene-oxide-containing metal surface pretreatment solution and application method thereof

[0023] A kind of phosphorus-free environment-friendly metal surface treatment liquid that has added graphene oxide, raw material mass percent is as follows:

[0024] Fluosilicic acid 1%, sodium molybdate 0.5%, sodium nitrate 1%, sodium chlorate 1.0%, edetate disodium 1%, tartaric acid 0.8%, graphene oxide 0.1%, and the balance is water.

[0025] After preparing the treatment solution of this example (pH=1.8), the surface of the cold-rolled sheet is treated, and the steps are as follows:

[0026] (1) Degreasing, water washing, pickling, and secondary water washing are performed on the surface of the cold-rolled sheet;

[0027] (2) Soak the cold-rolled sheet treated in step (1) in the treatment solution for 5 minutes at room temperature;

[0028] (3) The cold-rolled sheet treated in step (2) is washed with water and then dried to complete the surface treatment.

[0030] A kind of phosphorus-free environment-friendly metal surface treatment liquid that has added graphene oxide, raw material mass percent is as follows:

[0031] Fluosilicic acid 1.5%, sodium molybdate 0.2%, sodium nitrate 1.2%, sodium m-nitrobenzene sulfonate 1.2%, disodium edetate 1.3%, tartaric acid 1.0%, graphene oxide 0.2%, the balance is water.

[0032] After preparing the treatment solution of this example (pH=1.8), the surface of the cold-rolled sheet is treated, and the steps are as follows:

[0033] (1) Degreasing, water washing, pickling, and secondary water washing are performed on the surface of the cold-rolled sheet;

[0034] (2) Soak the cold-rolled sheet treated in step (1) in the treatment solution for 4 minutes at room temperature;

[0035] (3) The cold-rolled sheet treated in step (2) is washed with water and then dried to complete the surface treatment.

[0037] A kind of, phosphorus-free environment-friendly metal surface treatment liquid that has added graphene oxide, the mass percent of raw material is as follows:

[0038] Fluosilicic acid 2%, sodium molybdate 0.8%, sodium nitrate 1.6%, sodium chlorate 0.6%, edetate disodium 1.7%, tartaric acid 1.5%, graphene oxide 0.2%, and the balance is water.

[0039] After preparing the treatment solution of this example (pH=1.8), the surface of the cold-rolled sheet is treated, and the steps are as follows:

[0040] (1) Degreasing, water washing, pickling, and secondary water washing are performed on the surface of the cold-rolled sheet;

[0041] (2) Spray the cold-rolled sheet treated in step (1) in the treatment solution for 3 minutes at room temperature;

[0042] (3) The cold-rolled sheet treated in step (2) is washed with water and then dried to complete the surface treatment.