The owner found that the polysulfide sealant filled before the head of the cable had aging cracking phenomenon, and the steel structure inside was found to rust after opening. After demonstration, the owner finally decided to adopt the oxidation polymerization coating technology with low surface treatment and long-term anti-corrosion advantages to carry out anti-corrosion treatment on the head of the cable, covering a total of 2225 node plates with an application area of about 1200 square meters.