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钢结构的防腐措施之涂层法

发布时间:2015-10-12 9:13:49 浏览次数:652
涂层法防腐蚀性一般不如长效防腐蚀方法(但目前氟碳涂料防腐蚀年限甚至可达50年)。所以用于室内钢结构或相对易于维护的室外钢结构较多。它一次成本低,但用于户外时维护成本较高。涂层法的施工的第一步是除锈。
    优质的涂层依赖于彻底的除锈。所以要求高的涂层一般多用喷砂喷丸除锈,露出金属的光泽,除去所有的锈迹和油污。现场施工的涂层可用手工除锈。涂层的选择要考虑周围的环境。不同的涂层对不同的腐蚀条件有不同的耐受性。涂层一般有底漆(层)和面漆(层)之分。底漆含粉料多,基料少。成膜粗糙,与钢材粘附力强,与面漆结合性好。面漆则基料多,成膜有光泽,能保护底漆不受大气腐蚀,并能抗风化。不同的涂料之间有相容与否的问题,前后选用不同涂料时要注意它们的相容性。涂层的施工要有适当的温度(5~38℃之间)和湿度(相对湿度不大于85%)。涂层的施工环境粉尘要少,构件表面不能有结露。涂装后4小时之内不得淋雨。

    涂层一般做4~5遍。干漆膜总厚度室外工程为150μm,室内工程为125μm,允许偏差为25μm.在海边或海上或是在有强烈腐蚀性的大气中,干漆膜总厚度可加厚为200~220μm.



Anticorrosive coating method is better than general long-term anti-corrosion methods (but the fluorine carbon paint anticorrosion fixed number of year even up to 50 years). So for indoor steel structure or outdoor steel structure is more relatively easy to maintain. It is a low cost, but when used in outdoor maintenance cost is higher. The first step is to rust removing coating method of construction.

High quality coating depends on thorough cleaning. So demanding coating generally use sand blasting derusting, showing the luster of the metal, remove all the rust and oil pollution. Site construction coating available manual derusting. The choice of coating should be consider the surrounding environment. Different coating have different tolerance to different corrosion conditions. Usually have a primer coating (layer) and finishes (layer). More primer containing powder, less makings. Film is rough, strong adhesion with the steel, and paint with good. Paint the makings, film-forming luster, can protect the primer from atmospheric corrosion, and resistance to weathering. Between different coatings are compatible or not, when choosing different coatings before and after the need to pay attention to the compatibility of them. Coating construction must have the appropriate temperature (between 5 ~ 38 ℃) and humidity (relative humidity is not greater than 85%). Less dust coating construction environment, the component surface there can be no condensation. 4 hours after coating must not get wet in the rain.

Coating generally do 4 ~ 5 times. Outdoor project total dry film thickness is 150 microns, indoor project is 125 microns, allowable deviation of 25 mu m. or sea at the beach or in a strong corrosive atmosphere, total dry film thickness can be upset for 200 to 220 microns.


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