PH regulator, water-based steel structure anticorrosive coating containing the pH regulator and capable of preventing weld joint flash rust and preparation method

The invention relates to the technical field of anticorrosive coating, and particularly discloses a pH regulator, water-based steel structure anticorrosive coating containing the pH regulator and capable of preventing weld joint flash rust and a preparation method. The pH regulator is prepared from DMAE, water and a strong alkali aqueous solution of active metal according to a mass ratio of (1-5):(1-2):(0.1-0.5). The water-based steel structure anticorrosive coating is prepared from the following raw materials in parts by weight: 30-40 parts of polymer emulsion, 15-25 parts of an antirust filler, 10-20 parts of talcum powder, 0.1-1 part of an anti-flash-rust assistant, 0.1-1.5 parts of the pH regulator and 20-30 parts of water. The water-based steel structure anticorrosive coating not onlycan prevent flash rust of a common steel structure main body, but also has a remarkable inhibition effect on the flash rust at a weld joint, can effectively inhibit the flash rust of the weld joint,thoroughly solves the prob