Abstract: Steel structure is one of the main types of building structures in modern buildings, but its fatal defects of being easy to corrode and not resistant to high temperatures need to be protected with anticorrosive and fireproof coatings. The fire resistance and corrosion resistance durability of self-made intumescent fireproofing coatings and their matching coatings were studied, and the basic performance, salt spray, aging and fire resistance of single coatings and composite coatings were tested. The test results show that acrylic intumescent fireproofing coatings have certain weathering and aging resistance, and can be applied in outdoor environments with urban and general industrial atmospheric pollution without the need for matching topcoats; For outdoor steel structure buildings with requirements for high fire resistance rating and high weather resistance, the intumescent fireproof coating can play a role in fire resistance while improving the anti-corrosion performance, reducing the design and use of intermediate coats.

Key words: steel structure, intumescent fireproofing coating, fire resistance, anti-corrosion durability