Pickling passivation method for stainless steel product added with EDTA-2Na

The invention discloses a pickling passivation method of a stainless steel product added with EDTA-2Na (Ethylene Diamine Tetraacetic Acid-2Na). According to the scheme, EDTA-2Na is added into the pickling solution, the EDTA-2Na is an important chelating agent and can chelate metal ions in the solution, and discoloration and deterioration caused by the metal ions are prevented. Boric acid is added into the pickling solution, so that the pickling solution has a smooth hand feeling, and a passivation layer of a treated pipe is glossy in appearance and better in quality. Sulfamic acid is adopted to replace sulfuric acid, has the advantages of being non-volatile, free of odor, small in toxicity to human bodies and the like, is a green metal cleaning agent replacing sulfuric acid and can be effectively fused with other acids, the problem that sulfuric acid needs to be used independently is solved, and the process cost is reduced. Therefore, the quality of the passivation film is improved, and the passivation effici