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Cable bridge anti-corrosion process

  • Categories:Zhongrui News
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  • Time of issue:2019-05-28 14:45
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(Summary description)Since some cable trays are in the air, it will inevitably be corroded. It is important to do anti-corrosion work. There are several points in general anti-corrosion: 1. Hot dip galvanizing. Zinc has good corrosion resistance under atmospheric conditions. Galvanizing is a method of sacrificing an anode to protect the cathode metal. Its corrosion resistance life depends on the thickness of the galvanized layer and the erosion rate. The thickness of the hot dip galvanized zinc layer is generally above 65 um (455 g/m2). The bonding surface of zinc and iron forms a layer of zinc-iron alloy, which enhances the adhesion of the zinc layer. Atmospheric exposure tests were carried out on hot dip galvanized coatings under various environmental conditions in foreign countries. From the test results, hot dip galvanizing can meet the

Cable bridge anti-corrosion process

(Summary description)Since some cable trays are in the air, it will inevitably be corroded. It is important to do anti-corrosion work. There are several points in general anti-corrosion:

1. Hot dip galvanizing. Zinc has good corrosion resistance under atmospheric conditions. Galvanizing is a method of sacrificing an anode to protect the cathode metal. Its corrosion resistance life depends on the thickness of the galvanized layer and the erosion rate. The thickness of the hot dip galvanized zinc layer is generally above 65 um (455 g/m2). The bonding surface of zinc and iron forms a layer of zinc-iron alloy, which enhances the adhesion of the zinc layer. Atmospheric exposure tests were carried out on hot dip galvanized coatings under various environmental conditions in foreign countries. From the test results, hot dip galvanizing can meet the

  • Categories:Zhongrui News
  • Author:
  • Origin:
  • Time of issue:2019-05-28 14:45
  • Views:
Information
Since some cable trays are in the air, it will inevitably be corroded. It is important to do anti-corrosion work. There are several points in general anti-corrosion:
 
1. Hot dip galvanizing. Zinc has good corrosion resistance under atmospheric conditions. Galvanizing is a method of sacrificing an anode to protect the cathode metal. Its corrosion resistance life depends on the thickness of the galvanized layer and the erosion rate. The thickness of the hot dip galvanized zinc layer is generally above 65 um (455 g/m2). The bonding surface of zinc and iron forms a layer of zinc-iron alloy, which enhances the adhesion of the zinc layer. Atmospheric exposure tests were carried out on hot dip galvanized coatings under various environmental conditions in foreign countries. From the test results, hot dip galvanizing can meet the requirements of the service life of cable trays. Because hot dip galvanizing has good corrosion resistance and high performance and price ratio, steel hot dip galvanized bridge is widely used at home and abroad. For components with thin walls and slenderness ratios. Problems such as deformation easily occur during hot dip galvanizing, and need to be considered in the structure of the cable tray and the galvanizing process.
 
2. Electroplating zinc. The electroplating zinc and hot dip galvanizing process are simple and the cost is low. There are no special requirements for the structure of the cable tray. The passivation of the electrogalvanized zinc can significantly improve its protective function. The electrogalvanized layer is generally around 12/zm. Therefore, it is not suitable for occasions where the corrosion resistance life requirement is high. Electroplating zinc has some ministry scales in China: such as CB·744～83, CB·745—83, JB/Z88—75, WS2-1—73, etc. The selection of the type of plating layer, the thickness of the coating, the adhesion strength of the coating, and the corrosion resistance test are clearly defined. The selection objects of these scales are different, and the content requirements are also different. There are many manufacturers of electrogalvanized bridges in China, which are different when referring to the above-mentioned relevant technical standards. In order to improve the corrosion resistance of electrogalvanized, it is possible to use a zinc-nickel alloy or a high passivation treatment after galvanizing.
 
3. Electrostatic spraying. The spray material is generally polyvinyl chloride powder, polyester powder or anti-corrosion powder. The coating thickness is around 100/1 rn. Electrostatic spraying has the characteristics of beautiful appearance and good chemical resistance. However, compared with the metal plating, the adhesion strength is low, and the washing resistance and particle wear resistance are poor. In the process of use, there is a problem of deterioration and localization, which may cause the local coating to fall off, thereby causing the steel substrate to rust, resulting in a large area of ​​bubbling and peeling of the coating. In addition, the coating has poor UV resistance and is generally not suitable for outdoor use.
 
4. Apply anti-rust paint. For components with large structural dimensions, they are generally only treated with anti-rust paint because they are limited by zinc pots, plating tanks, ovens, etc. It has the characteristics of low cost and easy use; but its anti-erosion ability is poor. Short service life and large maintenance workload are generally not suitable. The bridge is made of aluminum alloy, which has already been applied abroad. Whether it is coastal salty areas or high humidity and contains sulfur dioxide gas. The cable tray made of aluminum alloy material adopts natural exposure, and the test results show that it has obvious superior corrosion resistance than the steel cable tray. In particular, the aluminum alloy is anodized to have a better anticorrosive effect.

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Next: Cable tray and pipe erection
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Next: Cable tray and pipe erection

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