corona rings and shield parts surface treatment

What Are Corona Rings And Shield Parts Surface Treatment?

Corona rings and shield parts surface treatment is one of the major factors every buyer should consider when purchasing them from China market.

The surface treatment is used to treat the exterior of corona rings and shields products by applying a thin complementary layer to their body surface.

There are many types of surface treatment processes for different applications.

By the end of this article guide, you will be knowledgeable on all aspects concerning surface treatment when importing corona rings and shield parts from your suppliers.

Without further ado, let’s jump straight into the topic to find the right solutions on corona rings and aluminum corona shields surface treatment.


Usually the polishing silvery bright is the final main standard surface finish of corona rings and shields not only for the indoor high voltage laboratory centers but also for the outdoor transmission lines.

The surface finish roughness is Ra3.2. The corona rings and shields production process is according to DIN ISO2768-MK general tolerances.

Other manufacturing standard includes general tolerances for welded constructions, tolerances for lengths, angles, tolerances for shape and position, etc will be in accordance with EN ISO 13920-B-F.

What Is The Insulating Varnish Painting Surface Treatment

For some outdoor applications, the coating insulating varnish corona ring and shield part will be used.

To some extent this kind surface treatment could increase the corrosion resistance of aluminum corona rings and shielding components.

The advantages of insulating varnish painting surface treatment:

  • It can be used to coat corona ring and shield that do not need be heated, as this process does not require higher temperatures to promote the process successfully.
  • The second advantage is that it will save more working time than the blue color painting process.
  • The third advantage it has over powder coating is its ability to produce a thin finish, making it ideal for corona rings and shields that require one.
  • Insulating varnish painting is more affordable as a finishing process than powder coating, making it suitable for both large and small finishing corona rings and shields.

What Is The Color Painting Surface Treatment

The color painting is the traditional process of applying a wet liquid paint to the corona ring and shield for finishing.

Most rings and shields production processes will use a spray, pump, or pressurized vessel to deliver the wet paint evenly.

This blue color painting corona rings and shields are often adopted in power transformer bushings design and manufacturing.

What Is Galvanized Surface Treatment


The galvanized process refers to a surface treatment technology that coats a layer of zinc on the surface of metals, alloys or other materials for aesthetics and rust prevention.

The main method used is hot-dip galvanizing.

This surface treatment is widely used in transmission line corona rings and insulator grading rings.

What Is Powder Coating Surface Treatment

Powder coating is a finishing process in which a coating is applied electrostatically to the ring’s or shield’s surface as a free-floating, dry powder before heat is used to finalize the coating.

Powder coating can be finished as two methods: thermosets and thermoplastics.

The powder can be made of many kinds of contents, such as polyester, polyurethane, polyester-epoxy, straight epoxy, and acrylics, etc.

So the powder coating surface treatment can be used for aluminum corona rings and shields.

What Is The Passivation Surface Treatment

It is a process used to improve the surface condition of aluminum rings and shields by dissolving the iron that is embedded in the surface by forming, machining, or other manufacturing steps.

This is achieved by placing the aluminum corona rings and shields into an acid solution to dissolve the residual iron and to form a thin oxide layer on the surface of metal.

It increased the corrosion resistance and maintains the dimensional integrity of close tolerance aluminum corona components.


What Is The Oxidation Surface Treatment

This type of surface treatment is typically used for light metal, such as small aluminum corona rings and shielding parts.

Anodization is a very common surface treatment that prevents corrosion on different corona rings and shielding parts.


Clearly, other questions should be considered when we discuss the topic of corona rings and shields surface treatment.

What’s more, there are other advantages and disadvantages to consider when we discuss the corona rings and shields surface treatment.

After the surface treatment and inspection is finished, all corona components will be packed carefully before shipment.

HIGHV professional team engineers are familiar with many surface treatments of corona rings and shield parts.

As the one of leading corona rings manufacturers in China, Highv is professional at manufacturing and supplying of aluminum corona rings with 30 years experience.

The engineers expert team are skilled at AUTO CAD, PROE, SOLID WORKS and UG softwares for your corona rings design and production.

Why not choose HIGHV for your aluminum corona rings and shield parts surface treatment here.