▎ 摘　　要

NOVELTY - Normal temperature blackening agent comprises 1-5 g/L selenite, 1-5 g/L copper sulfate, 1-5 g/L nickel nitrate, 1-4 g/L dihydrogen phosphate, 1-5 mL/L phosphoric acid, 1-3 g/L citric acid, 0.5-1.5 g/L potassium potassium phosphate, 0.5-1.5 mL/L OP-10 emulsifier and 0.04-0.07 g/L graphene oxide. USE - Normal temperature blackening agent used for steel uses water as a solvent. ADVANTAGE - The normal temperature blackening agent mainly adds a certain amount of graphene oxide to the selenium-copper room temperature blackening system to obtain a new type of steel room temperature blackening agent that is more excellent in protection and decoration. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing a normal temperature blackening agent, which involves mixing components of the steel room temperature blackening agent until all the components are dissolved to obtain a steel room temperature blackening agent; and (2) a method for blackening a steel room temperature blackening agent, which involves immersing the steel sample in the steel normal temperature blackening agent to make the surface of the sample completely black, and after forming a uniform film layer, taking it out immediately and leave it in the air for 1-3 minutes, and after cleaning, a blackened steel sample is obtained.