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热镀锌钢管的“热镀”科学形成

一、镀锌的基础知识

1. Basic knowledge of galvanizing

镀锌分为热镀锌和冷镀锌(电镀)。热镀锌又分为热浸镀锌和渗锌。热浸镀锌,是钢铁构件浸入熔融的锌液中取得金属掩盖层的一种方法,是将除锈后的钢件浸入500℃左右消融的锌液中,使钢构件外表附着锌层,然后起到防腐的目的。首要用于各行业的金属结构设施上。自从1836年法国把热镀锌应用于工业以来,已经有了一百七十八年的前史。

Zinc plating is divided into hot-dip galvanized and cold galvanized (electroplating). Hot dip galvanizing is also divided into hot dip galvanizing and zinc permeation. Hot dip galvanizing is a method for steel components immersed into molten zinc liquid to obtain a metal cover layer. It is to immerse the steel parts after the rust removal in the molten zinc solution about 500 degrees C, so that the steel structure is attached to the zinc layer, and then the purpose of anticorrosion is. It is mainly used in the metal structure and facilities of various industries. Since France used hot dip galvanizing in industry in 1836, it has had a history of one hundred and seventy-eight years.

二、热浸镀锌防腐的科学原理

Two. The scientific principle of anticorrosion of hot dip galvanizing

1.热浸镀锌层的防护功能

  1. protective function of hot dip galvanizing layer

  2. 20171214420440.jpg

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,必定程度上减缓锌的腐蚀,这层维护膜(也称白锈)遭到损坏又会构成新的膜层。当锌层损坏严峻,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,铁作为阴极遭到维护。君诚牌热镀锌钢管表里外表锌层掩盖才能好,镀层细密,无有机物搀杂,是镀锌行业界的质量第一品牌。

The mechanism of zinc corrosion resistance is mechanical maintenance and electrochemical maintenance. Under atmospheric corrosion, there are ZnO, Zn (OH) 2 and alkaline zinc carbonate maintenance film on the surface of zinc. The corrosion of zinc can be slowed down to a certain extent. The damage of this layer of maintenance film (also called white rust) will form a new membrane layer. When the zinc layer is seriously damaged and endanger the iron matrix, zinc has electrochemical maintenance to the matrix, the normal potential of zinc is -0.76V, the standard potential of iron is -0.44V, zinc and iron are dissolved in the micro battery as the anode, and iron is maintained as the cathode. Juncheng brand hot-dip galvanized steel pipe surface and exterior zinc coating cover can be good, fine coating, no organic adulteration, is the quality of the first brand galvanized industry.

2.热浸镀锌锌层的生成原理

2. generation principle of zinc coating in hot dip 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,其进程可简略地叙述为: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交融,原子之间引力比较小。因而,当锌在固熔体中到达饱满后,锌铁两种元素原子相互分散,分散到(或叫渗入)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0.003%。

The process of the composition of the hot-dip galvanizing layer is the process of forming an iron zinc alloy between the iron matrix and the outermost pure zinc layer. The surface of the workpiece is made up of an iron zinc alloy layer when hot dipping, which makes it good to combine the iron with the pure zinc layer. The process can be briefly described as: when the iron workpiece is immersed in the molten zinc solution, the zinc and the alpha is formed at the interface first. Iron (Ti Xin) solid melt. This is the matrix metal iron in the solid state dissolved in zinc atoms constitute a crystal, two metal atoms are fused, the gravity between the atoms is relatively small. As a result, when zinc reaches its fullness in the solid melt, the two atoms of zinc and iron are dispersed and dispersed to (or called the infiltrated) iron matrix to relocate in the matrix lattice and gradually form an alloy with iron, and the iron dispersed into the molten zinc solution is composed of the metal intermetallic compound FeZn13 and the bottom of the hot-dip galvanized pan, that is, zinc. Slag. When the workpiece is removed from the zinc leaching solution, the surface forms a pure zinc layer, which is a six party crystal. The iron content is not more than 0.003%.

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Thank you for your reading, the source of this article: Ji'nan galvanized pipe more content and questions please click: we will continue to work hard for you to provide service, thank you for your support!


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