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.

電鍍鋅我國(guó)有部頒標(biāo)準(zhǔn)。對(duì)電鍍層種類的選擇、鍍層厚度、鍍層附著強(qiáng)度、耐腐蝕試驗(yàn)等都有明確規(guī)定，這些標(biāo)準(zhǔn)的選用對(duì)象不同，內(nèi)容要求也有差異。我國(guó)目前生產(chǎn)電鍍鋅橋架的廠家較多，在參照應(yīng)用上述有關(guān)技術(shù)標(biāo)準(zhǔn)時(shí)也不相同。為了提高電鍍鋅的耐腐蝕性，可以采用電鍍鋅鎳合金或鍍鋅后進(jìn)行高鈍化處理（產(chǎn)品如“電鍍鋅橋架”）。

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").

電纜橋架

Cable tray

熱浸鍍鋅。在大氣條件下，鋅具有較好的耐腐蝕性。鍍鋅作為一種犧牲陽(yáng)極來保護(hù)陰極金屬的方法。其耐腐蝕壽命取決于鍍鋅層厚度和腐蝕速率。熱浸鍍鋅的鋅層厚度一般在65um(455g／m2)以上。鋅與鐵的結(jié)合面形成一層鋅鐵合金，增強(qiáng)了鋅層的附著力。國(guó)外對(duì)各種不同環(huán)境條件下的熱浸鍍鋅層進(jìn)行了大氣暴露試驗(yàn)。

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.

從試驗(yàn)結(jié)果看，熱浸鍍鋅可以滿足電纜橋架使用壽命的要求。因熱浸鍍鋅具有良好的耐腐蝕性和較高的性能與比，因而鋼制熱浸鍍鋅橋架在國(guó)內(nèi)外得到廣泛應(yīng)用。對(duì)于薄壁及長(zhǎng)細(xì)比比較大的構(gòu)件，在熱浸鍍鋅時(shí)容易產(chǎn)生變形等問題，需要在電纜橋架的結(jié)構(gòu)上及鍍鋅工藝上加以考慮。

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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