Electro galvanized. Compared with hot-dip galvanizing, electrogalvanizing has simple process and low cost. There are no special requirements for the structure of cable tray. The passivation treatment of electrogalvanizing can significantly improve its protection performance. The galvanized layer is generally about 12. Therefore, it is not suitable for occasions with high requirements for corrosion resistance life.

电镀锌我国有部颁标准。对电镀层种类的选择、镀层厚度、镀层附着强度、耐腐蚀试验等都有明确规定，这些标准的选用对象不同，内容要求也有差异。我国目前生产电镀锌桥架的厂家较多，在参照应用上述有关技术标准时也不相同。为了提高电镀锌的耐腐蚀性，可以采用电镀锌镍合金或镀锌后进行高钝化处理（产品如“电镀锌桥架”）。

Electrogalvanizing has a ministerial standard in China. There are clear provisions on the selection of electroplating coating types, coating thickness, coating adhesion strength, corrosion resistance test, etc. These standards have different selection objects and content requirements. At present, there are many manufacturers producing galvanized cable tray in China, and they are different when referring to the above technical standards. In order to improve the corrosion resistance of galvanization, galvanization nickel alloy can be used or highly passivated after galvanization (products such as "galvanization bridge").

电缆桥架

Cable tray

热浸镀锌。在大气条件下，锌具有较好的耐腐蚀性。镀锌作为一种牺牲阳极来保护阴极金属的方法。其耐腐蚀寿命取决于镀锌层厚度和腐蚀速率。热浸镀锌的锌层厚度一般在65um(455g／m2)以上。锌与铁的结合面形成一层锌铁合金，增强了锌层的附着力。国外对各种不同环境条件下的热浸镀锌层进行了大气暴露试验。

Hot dip galvanizing. Under atmospheric conditions, zinc has good corrosion resistance. Galvanizing is used as a sacrificial anode to protect cathode metal. Its corrosion resistance life depends on the thickness of zinc coating and corrosion rate. The thickness of hot-dip galvanized zinc layer is generally above 65um (455g/m2). The interface between zinc and iron forms a layer of zinc iron alloy, which enhances the adhesion of zinc layer. The atmospheric exposure tests of hot-dip galvanized coatings under various environmental conditions have been carried out abroad.

从试验结果看，热浸镀锌可以满足电缆桥架使用寿命的要求。因热浸镀锌具有良好的耐腐蚀性和较高的性能与比，因而钢制热浸镀锌桥架在国内外得到广泛应用。对于薄壁及长细比比较大的构件，在热浸镀锌时容易产生变形等问题，需要在电缆桥架的结构上及镀锌工艺上加以考虑。

According to the test results, hot-dip galvanizing can meet the requirements for the service life of cable tray. Because hot-dip galvanizing has good corrosion resistance and high performance price ratio, steel hot-dip galvanizing bridge is widely used at home and abroad. For components with thin wall and large slenderness ratio, deformation is easy to occur during hot dip galvanizing, which needs to be considered in the structure of cable tray and galvanizing process.

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