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冷镀锌与热镀锌在外观上有什么区别?

来源:http://www.jnxxjm.com

【 发布于:2019-01-11 17:17:28 】


冷镀锌外表比较光滑、明亮、均匀、平整,采用彩色钝化工艺的电镀层也黄绿色为主色,呈七彩。采用白色钝化工艺的电镀层呈青白色或白色呈绿光,白色钝化工艺的镀层与阳光呈一定角度下略显七彩。冷镀钢钢管内只有两端有少许锌层,再往里没有镀锌层,冷镀锌钢管两端一样光滑,绝对没有锌瘤发生,且钢管外表没有履行规范。

The appearance of cold galvanizing is smooth, bright, uniform and even. The electroplating layer with color passivation process is also yellow-green, showing seven colors. The white passivation coating is blue-white or green, while the white passivation coating is slightly colorful from a certain angle to the sunlight. There are only a few zinc layers on both ends of the cold-dipped steel pipe, and no zinc layers on both ends of the cold-dipped steel pipe. The two ends of the cold-dipped galvanized steel pipe are as smooth as before, and there are absolutely no galvanizing tumors, and the appearance of the steel pipe does not comply with the specifications.

在杂乱工件的角棱部位简单发生;电烧而成暗淡,该部位锌层较厚。在阴角部位易构成电流死角而发生欠电流暗淡区,该区域锌层较薄。工件整体无锌瘤、结块等现象。

It occurs simply at the corner and edge of the disordered workpiece, and becomes dim by electric firing, where the zinc layer is thicker. It is easy to form a dead angle of current at the pudendal corner and produce a dark area of undercurrent, where the zinc layer is thinner. There are no zinc nodules and caking on the whole workpiece.

热镀锌外观与冷镀锌比较,颜色较暗,略微显粗糙,没有冷镀锌光滑,外观呈银白色,简单发生工艺水纹和少许滴瘤,尤其是在工件的一端较为明显,且外表不发亮,不太反光。热镀锌钢管的两端有蓝色油墨印的箍,通体有履行规范和规格型号。在热镀锌钢管的一端有锌针或少许瘤挂,内外都有完好的镀锌层。

Compared with cold galvanizing, the appearance of hot galvanizing is darker, slightly rough, no smooth galvanizing, silvery white, simple process water marks and a few droplets, especially at one end of the workpiece, and the appearance is not bright and not reflective. Hot-dip galvanized steel pipes have blue ink stamped hoops at both ends, and all of them have specifications and specifications. At one end of the hot-dip galvanized steel pipe, there are zinc needles or a few tumors hanging, both inside and outside have good galvanized layer.

总归,热镀锌的锌层比冷镀锌的锌层厚几十倍,防腐蚀性能也是冷镀锌的几十倍。

In a word, the zinc layer of hot galvanizing is tens of times thicker than that of cold galvanizing, and its corrosion resistance is also tens of times that of cold galvanizing.

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在现在,许多企业挑选钢格板,格栅板,钢格栅板产品,用于工厂内部平台踏板,天花吊顶等施工项目。根据项目的不同,客户对产品质量的要求也不同,尤其是在镀锌质量要求上。

At present, many enterprises choose steel grille, grille, steel grille products for the construction of platform pedals, ceiling and other projects in the factory. According to different projects, customers have different requirements for product quality, especially for galvanizing quality.

原理:热镀锌掩盖能力好,镀层致密,无有机物搀杂。众所周知,锌的抗大气腐蚀的机理有机械维护及电化学维护,在大气腐蚀条件下锌层外表有ZnO、Zn(OH)2及碱式碳酸锌维护膜,一定程度上减缓锌的腐蚀,这层维护膜(也称白锈)受到破坏又会构成新的膜层。当锌层破坏严峻,危及到铁基体时,锌对基体发生电化学维护,锌的规范电位-0.76V,铁的规范电位-0.44V,锌与铁构成微电池时锌作为阳极被溶解,铁作为阴极受到维护。明显热镀锌对基体金属铁的抗大气腐蚀能力优于电镀锌。

Principle: Hot-dip galvanizing has good covering ability, compact coating and no organic adulteration. It is well known that the anti-atmospheric corrosion mechanism of zinc is mechanical maintenance and electrochemical maintenance. Under atmospheric corrosion conditions, zinc coating has zinc oxide, zinc (OH) 2 and basic zinc carbonate maintenance film on its surface, which to a certain extent slows down the corrosion of zinc. This maintenance film (also known as white rust) will be damaged and form a new film. When zinc layer is destroyed severely and iron matrix is endangered, zinc maintains electrochemically. The standard potential of zinc is -0.76V, the standard potential of iron is -0.44V. When zinc and iron form micro-battery, zinc is dissolved as anode and iron as cathode is maintained. The atmospheric corrosion resistance of hot-dip galvanizing to base metal iron is better than that of galvanizing.

热镀锌层构成进程是铁基体与最外面的纯锌层之间构成铁-锌合金的进程,工件外表在热浸镀时构成铁-锌合金层,才使得铁与纯锌层之间很好结合,其进程可简单地叙述为:当铁工件浸入熔融的锌液时,首先在界面上构成锌与α铁(体心)固熔体。这是基体金属铁在固体状态下溶有锌原子所构成一种晶体,两种金属原子之间是融合,原子之间引力比较小。因此,当锌在固熔体中到达饱和后,锌铁两种元素原子相互分散,分散到(或叫进入)铁基体中的锌原子在基体晶格中搬迁,逐步与铁构成合金,而分散到熔融的锌液中的铁就与锌构成金属间化合物FeZn13,沉入热镀锌锅底,即为锌渣。当工件从浸锌液中移出时外表构成纯锌层,为六方晶体。其含铁量不大于

The formation process of hot dip galvanizing layer is the process of forming iron-zinc alloy between iron base and the outermost pure zinc layer. The iron-zinc alloy layer is formed on the surface of the workpiece during hot dip galvanizing, which makes the iron and pure zinc layer combine well. The process can be simply described as: when the iron workpiece is immersed in molten zinc solution, the first solid melt of zinc and alpha iron (core) is formed on the interface. This is a kind of crystal formed by the dissolution of zinc atoms in the solid state of the matrix metal iron. The two metal atoms are fused, and the attraction between the atoms is relatively small. Therefore, when zinc saturates in the solid melt, the two elements of zinc and iron disperse each other, and the zinc atoms disperse into (or enter) the iron matrix move in the lattice of the matrix, and gradually form alloys with iron, while the iron dispersed in the molten zinc liquid forms the intermetallic compound FeZn13 with zinc, and sinks into the bottom of the hot-dip galvanizing pot, that is, zinc slag. When the workpiece is removed from the zinc dipping solution, the surface of the workpiece forms a pure zinc layer, which is a hexagonal crystal. Its iron content is not greater than

冷镀锌工艺用于维护金属防止腐蚀,为此使用了锌填料的涂料,在使用任何一种涂敷的办法将其涂在被维护外表,干燥之后构成锌填料涂层,在干燥涂层中具有含量的锌(到达95%)。适合于修补作业(即在修补作业进程中,仅在被维护的钢外表损害的当地,只要修补好外表就可以重新涂敷)。冷镀锌工艺用于各种钢制品和构筑物的防腐。(冷镀锌就是电镀锌,镀锌量很少,只有10-50g/m2,其自身的耐腐蚀性比热浸镀锌相差许多。采用电镀锌的价格相对便宜一些。

Cold galvanizing process is used to protect metals from corrosion. For this reason, zinc filler coatings are used, which are coated on the maintained surface by any coating method. After drying, zinc filler coatings are formed, which contain zinc (up to 95%) in the drying coatings. Suitable for repairing operation (that is, in the process of repairing operation, only in the locality where the surface of the steel is damaged by maintenance, as long as the surface is repaired, it can be re-coated). Cold galvanizing process is used for corrosion protection of various steel products and structures. (Cold galvanizing is galvanizing, the amount of galvanizing is very small, only 10-50g/m2, its corrosion resistance is much different than hot dip galvanizing. The price of galvanizing is relatively cheap.

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