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引起槽钢腐蚀的原因主要有化学腐蚀和电化学腐蚀，为了不影响槽钢的使用性能，应采取有效的防腐蚀措施。 通过喷铝涂层加防腐蚀涂料进行封闭，可以大大延长涂层的使用寿命，结合理论与实际应用的效果来看， 喷铝或喷锌涂层是较理想的防腐蚀底层。喷铝层与钢铁基体结合强度高，涂层寿命长，具有较好的长期经济效益； 喷涂工艺灵活便捷，适用于长效保护大型且难以维护的钢结构，可现场施工。根据镀锌工艺的不同， 热镀锌槽钢可分为热浸锌槽钢和热吹镀锌槽钢，将除锈后的钢件浸入到440~460℃左右熔融的锌液中， 使钢构件表面附着上锌层，进而起到防腐蚀作用。通常情况下，锌层表面形成一层非常薄且致密的氧化锌层， 它很难溶于水，因而对槽钢有一定的保护作用。当空气中的氧化锌与空气中的其他成分形成不溶性锌盐时， 防腐蚀效果更好。槽钢的耐蚀性主要取决于镀锌层的厚度，在槽钢表面涂覆一层较厚的纯锌层， 可避免槽钢基体与各种腐蚀溶液的接触，具有很强的抗腐蚀能力，保护槽钢不受腐蚀， 并能长时间与钢结构牢固粘接，防止表面受到损伤。 The main causes of trough steel corrosion are chemical corrosion and electrochemical corrosion. In order not to affect the service performance of trough steel, effective corrosion prevention measures should be taken. Closing by aluminum spraying coating and anti-corrosion protection coating can greatly extend the service life of the coating. Combined with the effect of theory and practical application, aluminum spraying or zinc spray coating is the ideal anti-corrosion layer. Aluminum spray layer and steel matrix have high binding strength and long coating life, with good long-term economic benefits; spraying process is flexible and convenient, suitable for long-term protection of large and difficult to maintain steel structure, can be constructed on site.According to the different galvanizing process, hot dip galvanized tank steel can be divided into hot dip zinc tank steel and hot blow galvanized tank steel, the rust removal of steel parts into about 440~460℃ of molten zinc liquid, so that the surface of the steel members attached to the zinc layer, and then play an anti-corrosion effect.Usually, the zinc layer surface forms a very thin and dense zinc oxide layer, which is difficult to dissolve in water, so it has a certain protective effect on the tank steel. The protection is better when zinc oxide forms insoluble zinc salts with other components in the air. The corrosion resistance of tank steel mainly depends on the thickness of the galvanized layer. Putting a thick pure zinc layer on the surface of tank steel can avoid the contact between the substrate of tank steel and various corrosion solutions, have strong corrosion resistance, protect the tank steel from corrosion, and can firmly bond with the steel structure for a long time to prevent the surface from damage.
热浸锌U型槽
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建筑钢结构铁槽10#
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