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钢结构防腐与防火涂层表面缺陷的控制

发布时间:2015-11-24 9:55:23 浏览次数:579


涂层的保护作用:屏蔽效果。涂层表面和腐蚀性介质接触的其他两个保护的目的。第二,电化学保护作用。油漆含有铁活性更高的金属锌粉。如果化学介质的骨头,金属,锌,涂层内部先接触发生的电化学反应锌作为牺牲阳极防腐蚀铁。


所以涂层完好无损时才能有效的保护作用。如果涂层出现缺陷,不好的保护作用。常见的表面缺陷及防止方法如表5个[ 9 ]。


防腐施工质量及施工环境也有很大关系。现在又防腐工程时,温度,湿度,考虑降雨、大风等因素。温度太高,溶剂挥发快涂层。简单的标记,起皱、针孔等。温度太低,涂料固化太慢甚至停止,还可能是表面凝固结水珠。夏天太阳直射下表面温度高达50℃以上。


所以夏天露天涂装工程。湿度太大,容易生锈,表面层,而且容易产生针孔、泛白等。一般来说,空气湿度大,80 %时停止的涂装工程。在风中飘扬먼지를保护表面污染会降低了涂层的附着力和涂层外观质量的影响。风、霜、雨、雨、雾天应停止涂装工程。




Protective effect of coating: shielding effect. The purpose of the other two protection of the coating surface and the corrosive medium. Second, electrochemical protection. Metal zinc powder paint containing iron with higher activity. If the chemical medium of the bone, metal, zinc, the internal first contact occurs the electrochemical reaction of zinc as the sacrificial anode corrosion.
So the coating is in good condition to protect the effect. If the coating is defective, the protective effect is not good. Common surface defects and prevention methods are shown in Table 5 [9].
Construction quality and construction environment also has a great relationship. Now, the anti-corrosion engineering, temperature, humidity, considering the factors such as rainfall, wind and other factors. Temperature is too high, solvent evaporation fast coating. Simple labeling, wrinkling, pinhole, etc.. The temperature is too low, curing too slow or even stop, also may be the bead surface solidification. In the summer, the surface temperature of the sun is above 50.
So the summer open-air painting works. The humidity is too large, easy to rust, the surface layer, but it is easy to produce white, pinhole etc.. Generally speaking, the air humidity is big, 80% when the stop of painting works. In the wind to protect the surface pollution can reduce the influence of coating adhesion and appearance quality of coating. Wind, frost, rain, rain, fog days should stop coating engineering.


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