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钢结构的防腐措施之热浸锌

发布时间:2015-10-12 9:11:22 浏览次数:630
    热浸锌是将除锈后的钢构件浸入600℃左右高温融化的锌液中,使钢构件表面附着锌层,锌层厚度对5mm以下薄板不得小于65μm,对厚板不小于86μm.从而起到防腐蚀的目的。
     这种方法的优点是耐久年限长,生产工业化程度高,质量稳定。因而被大量用于受大气腐蚀较严重且不易维修的室外钢结构中。如大量输电塔、通讯塔等。近年来大量出现的轻钢结构体系中的压型钢板等。也较多采用热浸锌防腐蚀。热浸锌的首道工序是酸洗除锈,然后是清洗。

     这两道工序不彻底均会给防腐蚀留下隐患。所以必须处理彻底。对于钢结构设计者,应该避免设计出具有相贴合面的构件,以免贴合面的缝隙中酸洗不彻底或酸液洗不净。造成镀锌表面流黄水的现象。热浸锌是在高温下进行的。对于管形构件应该让其两端开敞。若两端封闭会造成管内空气膨胀而使封头板爆裂,从而造成安全事故。若一端封闭则锌液流通不畅,易在管内积存。




Hot-dip zinc is about 600 ℃ after rust removal of steel members in high temperature melting liquid zinc, zinc layer adhered on the surface of the steel members, the zinc layer thickness of 5 mm below the sheet should not be less than 65 microns, the plate is not less than 86 microns. Thereby the purpose of corrosion protection.

The advantage of this approach is durable life long, the production of high degree of industrialization, quality and stability. So heavily used by atmospheric corrosion is serious and difficult maintenance of outdoor steel structure. Such as a large number of transmission tower, communication tower, etc. In recent years a large number of the pressed steel sheet of light steel structure system, etc. More also adopts hot-dip zinc corrosion. Hot dip zinc is the first working procedure pickling, and then is clean.

Both procedure does not completely to corrosion resistance. So must be dealt with thoroughly. For steel structure designer, should avoid design phase of the joint components, in order to avoid the joint surface crack in the pickling incomplete or acid wash not clean. Galvanized surface flow including yellow phenomenon. Hot dipped zinc was conducted at high temperatures. For tubular components should let it open on both ends. If both ends closed air inflation will cause the tube and make the head plate burst, causing accidents. If one end closed the zinc liquid circulation, easy to accumulate in the tube.



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