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彩涂镀锌板强大的防腐功能

返回列表 来源: 发布日期: 2019.09.25

彩涂镀锌板强大的防腐功能

彩涂镀锌板作为一种连续的卷材生产工艺,可分为镀锌和热浸镀锌两种方法,其中镀锌法是将金精忠漆用电沉积的方法镀上“锌金属或锌合金”。热镀锌,也称为热浸镀锌,是将保持金属产品浸渍在熔融的锌金属中,在其表面形成保持金属涂层。与电镀方法相比,铁水镀层更厚,在相同环境下使用寿命更长。

热镀锌钢的腐蚀与纯锌相当。锌在大气中的腐蚀过程与钢在大气中的腐蚀过程相似。锌与水膜凝结后发生化学氧化腐蚀,锌表面发生电化学腐蚀。在中性或弱酸性环境中,彩涂镀锌板在腐蚀后形成。腐蚀产物是不溶性化合物(氢氧化锌、氧化锌和碳酸锌),通过沉积将其分离并形成一层细小的薄层 
一般情况下,厚度可达8微米。这种薄膜有一定厚度,不易溶于水,附着力强。因此,它能在大气和彩涂镀锌板之间起到阻隔作用,避免腐蚀的进一步发展。镀锌层在维修过程中损坏。钢件暴露在大气环境中。
目前,锌和铁构成微型电池。锌的电位明显低于铁的电位。锌作为一种阳极,在维护钢板基体和避免钢板腐蚀方面起着特殊的作用。彩涂镀锌板是液体涂层,通过刷涂或辊涂在干净的金属表面上。加热固化后,可获得与石材厚度相同的涂料。
漆膜的作用除了使金属与腐蚀介质分离外,还可以在涂装过程中借助一些颜料(如铅、铬酸锌等)使金属钝化,达到永久性的防腐效果。根据彩涂钢板的防腐蚀机理,有机涂层(包括固体涂层和底层涂层)是一种阻隔材料,它将基体与腐蚀介质隔开,达到防腐蚀效果。
As a continuous coil production process, galvanized sheet can be divided into galvanizing and hot-dip galvanizing methods, in which galvanizing method is to make the Jinjingzhong painting coated with "zinc metal or zinc alloy" by electrodeposition. Hot dip galvanizing, also known as hot dip galvanizing, is to impregnate the maintained metal products in molten zinc metal to form a maintenance metal coating on its surface. Compared with the electroplating method, the hot metal coating is thicker, and its life is longer in the same environment.
The corrosion of hot-dip galvanized steel is equivalent to that of pure zinc. The corrosion process of zinc in atmosphere is similar to that of steel in atmospheric condition. Chemical oxidation corrosion occurs, and electrochemical corrosion occurs on the surface of zinc condensed with water film. In neutral or weak acidic atmosphere, galvanized steel sheet is formed after corrosion. Corrosion products are insoluble compounds (zinc hydroxide, zinc oxide and zinc carbonate), which will be separated by deposition and form a fine thin layer.
Generally, the thickness can reach 8 microns. This kind of film has a certain thickness, is not simply soluble in water, and has strong adhesion. Therefore, it can play a barrier effect between atmosphere and galvanized sheet, and avoid further development of corrosion. The galvanized coating was damaged during maintenance. The steel part is exposed to atmospheric environment.
At present, zinc and iron constitute micro-batteries. The potential of zinc is significantly lower than that of iron. As an anode, zinc plays a dedicated role in the maintenance of the steel plate substrate and avoids the corrosion attack of the steel plate. Colour-coated galvanized sheets are liquid coatings, which are coated on clean metal surfaces by brushing or roller coating. After heating and curing, coatings with the same thickness of stone can be obtained.
In addition to separating metals from corrosive media, the effect of paint film can also passivate metals with the help of some pigments (such as lead, zinc chromate, etc.) in the painting process to achieve permanent anti-corrosion effect. According to the anticorrosion mechanism of colorful coated steel plate, organic coating (including solid coating and bottom coating) is a barrier material, which separates the substrate from the corrosive medium to achieve the anticorrosion effect.

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