Zinc Coated Cable Tray

If copper is laid directly onto a galvanized surface the zinc will rapidly corrode. Thus cables should always have an insulating sheath if they are to be installed on galvanized cable ladder or tray. The rate of corrosion depends upon the differences in electrical potential of the metals as...

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If copper is laid directly onto a galvanized surface the zinc will rapidly corrode.

Thus cables should always have an insulating sheath if they are to be installed on galvanized cable ladder or tray. 

The rate of corrosion depends upon the differences in electrical potential of the metals as defined by the Galvanic Series.(Figure 1)The strength of the electrolyte, the period for which the electrolyte is present, and the geometry of the connection between the dissimilar metals are all influencing factors. When corrosion occurs it is the anodic metal (which is higher in the galvanic series) which will corrode in preference to the cathodic metal (which is lower in the galvanic series).

The best way to prevent electro-chemical corrosion is to ensure that all system components have the same finish e.g. all components HDG or all components stainless steel.

Even when two dissimilar metals are in moist contact, electrochemical corrosion need not necessarily take place. Its likelihood depends upon the potential difference between the two metals; this can be obtained by taking their respective values from the Galvanic Series chart shown in Figure 26 and subtracting one from the other.

Consider the example of a tray or ladder with a thick protective zinc coating over a large area connected together using stainless steel fixings each having a small surface area. The stainless steel, in contact with the galvanizing, causes only minor corrosion of the zinc because of the small area of the stainless steel fixing in comparison with the much larger surface area of the zinc coating.

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Figure 1

Galvanic Series Chart

 

 

The merits of zinc:

The Galvanic Series Chart clearly indicates why zinc is such a useful corrosion resistant coating for mild steel.

Firstly it forms an impervious zinc barrier around the steel, coating it with a metal whose own rate of chemical corrosion is both low and predictable in most situations. Secondly, if the coating is damaged at any point (e.g. at a cut edge) the zinc surrounding the damaged area becomes the anode of the electrolytic cell and is sacrificially corroded away very slowly in preference to the underlying steel. Corrosion products from the zinc may also be deposited onto the steel, effectively re-sealing the surface and maintaining the integrity of the barrier. This ensures the strength of the steel structure remains unaffected.

Because zinc appears near the top of the Galvanic Series it will act as a sacrificial anode in relation to most other metals; thus its relatively low cost and the ease with which it can be applied as a galvanized coating on steel means that it continues to be the most commonly specified protective finish for support systems. 

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Factory information: 

Welcome to our factory !

Factory Name

Jiangsu Changcheng Cable Co.,Ltd

Location

Lingtang Town,Yangzhou,Jiangsu ,China

Establishes in

1990,more than 25 years’ experience in cable manufacturing

Export office location

Yunhe Building,Hanjiang Area,Yangzhou,China

Our main products

Control cable

Instrumentation cable

Power cable

Cable and electrical wires for installation

High temperature cable

Flame retardant and Fire-resistant cable

Special cable

Cable tray

Street lighting

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