About the steel structure anti-corrosion and fire prevention methods

steel structure fire prevention and anti-corrosion measures:
China's steel structure engineering fire prevention mainly uses fire-resistant paint, foaming fire-resistant paint and outsourcing fire-resistant layer and other methods. For exposed steel structural components, such as stairs and other multi-use coatings and lacquer materials, the use of 10 to 40mm thick paint, fire resistance limit of up to 1.5 to 3h, and foam paint fire resistance time is generally 0.5h. For hidden components, pearl rock and zircon fire spraying or fire protection board is an economical and effective method, 30 to 40mm thick spray can achieve a fire resistance limit of 1.5h, and also has a certain degree of corrosion resistance . In the construction work, the use of steel structure is still a lot, for steel structure, how to do a good job of corrosion and fire prevention,
below the introduction of steel structure commonly used anti-corrosion methods:
steel structure commonly used zinc spray or aluminum spray, aggravated corrosion coating to form a long-lasting anti-corrosion structure, or with supporting heavy anti-corrosion paint coating protection. Metal zinc and aluminum have great resistance to atmospheric corrosion. Zinc or aluminum is sprayed on steel components, zinc, aluminum are negative potations and steel form at the expense of anode protection so that steel is basically protected.
Currently using aluminum spray coating to prevent corrosion of industrial atmosphere, ocean atmosphere, its characteristics are as follows:
(1) process flexibility, suitable for important large-scale and difficult to maintain the long-term protection of steel structures, can be on-site construction;
(2) spray aluminum coating and steel substate binding force is strong, long coating life, long-term economic benefits are good;
(3) zinc spray or aluminum coating with anti-corrosion coating closed, can greatly extend the life of the coating, from the theoretical and practical application of the effect, zinc spray or aluminum coating is the best bottom layer of anti-corrosion coating. The protective life of the composite coating of the metal spray coating and the anti-corrosion coating is longer than the combined life of the metal spray coating and the anti-corrosion coating protective layer, which is several times that of a single coating protective layer.
anti-corrosion long-lasting paint consists of primers, intermediate paints and finishes.
long-term economical considerations, aluminum coating is the most economical, but the one-time investment is too large, well-constructed coating can be 10 years without maintenance. Epoxy zinc-rich primer and epoxy cloud iron intermediate paint and acrylic polyurethane long-lasting protection system has better economy.