▎ 摘　　要

NOVELTY - A sealant comprises 0.1-2 pts. wt. graphene, 0.1-2 pts. wt. graphene dispersant, 10-50 pts. wt. silica sol (s1), 10-50 pts. wt. silica sol (s2), 20-50 pts. wt. water-soluble polymer resin emulsion, 1-10 pts. wt. silane coupling agent, and 10-50 pts. wt. water. The silica particles in the silica sol (s1) and the silica sol (s2) have different particle diameters. USE - Sealant used in sealing liquid for sealing nickel-plated layer in nickel-plated metal component (all claimed). ADVANTAGE - The sealant can form a dense protective film on the surface of the plating layer when processing nickel-plated components. The film has a strong binding force with the nickel-plated steel components. The neutral salt spray test of the coating can reach up to 72 hours, which is better than the existing sealant. The sealing agent is environmentally-friendly, effective even in less dosage and simple to use and meets the EU ROHS ( European union restriction of hazardous substance) standard. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the sealant; (2) sealant liquid, which comprises the sealant; and (3) nickel-plated metal component, which comprises the nickel-plated layer and a sealing layer enclosed on the surface of the nickel-plated layer. The sealing layer is formed of the sealant or the sealing liquid.