Corona ring and shield surface treatment is one of the major factors every importer should consider when purchasing them from China suppliers.
Metal surface treatment is used to treat the exterior of a metal product by applying a thin complementary layer to body surface.
There are many types of metal surface treatment processes for different application.
By the end of this article guide, you will be knowledgeable on all aspects concerning surface treatment when importing aluminum corona rings and shields from China markets.
Why Should We Consider The Corona Ring And Shield Surface Treatment
What is metal surface treatment?
Many import beginners only think it as aesthetic finishes like painting or powder coating in order to make corona rings look exquisite and only change the color.
As you know, choosing the wrong material and surface treatment ring will waste your money and result in the high voltage test failure.
Usually the polishing silvery bright is the final main surface finish for corona components not only for the indoor high voltage laboratory centers but also for the outdoor transmission lines.
The surface finish roughness is Ra3.2. The aluminum corona ring 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.
But in some special application, the different surface treatment will be adopted on the ring body for making sure the good corona effect.
Want more corona ring and shield surface treatment details based on polishing bright finish here?
Let’s keep reading.
What Is The Insulating Varnish Painting Surface Treatment
In some outdoor application, the coating insulating varnish corona ring and shield will be used.
To some extent this kind surface treatment could increase the corrosion resistance of aluminum corona components.
What the advantages of insulating varnish painting surface treatment?
- It can be used to coat corona ring 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.
What Is The Color Painting Surface Treatment
The color painting is the traditional process of applying a wet liquid paint to the aluminum corona ring for finishing.
Most rings 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.
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 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.
What Is The Passivation Surface Treatment
It is a process used to improve the surface condition of aluminum rings 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 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 corona components.
What Is The Oxidation Surface Treatment
This type of surface treatment is typically used for light metal, such as aluminum parts.
Anodization is a very common surface treatment that prevents corrosion on aluminum corona rings and shielding parts.
Clearly, there are other advantages and disadvantages to consider when we discuss the corona ring and shield surface treatment.
After the surface treatment and inspection is finished, all corona components will be packed carefully before shipment.
Highv professional engineers are familiar with many surface treatments of aluminum corona rings and shielding components.
Why not choose the right surface treatment here.
Call us today or email us for more benefits to support your high voltage corona projects.