How does the application of conductive anti-corrosion coatings change the traditional concept?

foreword

With the rapid development of the electric power industry, power grid companies pay more attention to grounding safety.

No.

So far, there are roughly three types of anti-corrosion measures for grounding grids:

(1) Solve the corrosion or delay the corrosion rate from the material itself, such as increasing the cross-sectional area of ​​the material used, or replacing the existing galvanized material with a non-ferrous metal (such as copper)

(2) According to the principle of electrochemical corrosion, the electrochemical protection method is adopted, and the typical method is the anode coating online coatingol.

(3) Using physical protection methods, such as composite materials, that is, coating a layer of non-ferrous metals on the surface of the steel, or directly using the method of spraying conductive anti-corrosion materials

Because the first two methods are limited by certain factors (such as cost), they cannot be widely used in practice

In the early 1990s, the idea of ​​using conductive anti-corrosion paint to prevent the corrosion of the grounding grid could theoretically solve the corrosion problem of the grounding grid "once and for all"

Nowadays, the corrosion of the grounding grid is recognized as a common fact.
As a special anti-corrosion technology for the grounding grid, the conductive anti-corrosion coating has quickly attracted people's attention, and will undoubtedly solve the problem of the grounding grid.
Corrosion problems bring new hope
.

No.
2 Main Features of Conductive Anti-Coatings

Put three flat irons in a 30% sulphuric acid solution bottle and you can clearly see two of them are bubbling constantly, while the other flat iron doesn't have a single bubble, which is really strange Phenomenon!

The two flat irons that were bubbling were ordinary fan iron and galvanized fan iron.
They reacted after contact with sulfuric acid solution.
Of course, their future "destiny" is to be gradually corroded by sulfuric acid solution
.

The other iron without bubbling can be observed to have a black coating on its surface
.
It is this layer of coating that effectively isolates the contact between iron and sulfuric acid solution, so it can be considered that this layer of coating has strong corrosion resistance to sulfuric acid solution
.
This surface-processed steel is the most suitable special anti-corrosion steel for grounding grids today
.

The surface coating of the special anti-corrosion steel for the grounding grid is essentially a special conductive anti-corrosion coating sprayed on the surface of the steel after the rust removal treatment, and a layer of film formed by itself at room temperature
.

This conductive anti-corrosion coating is a new anti-corrosion technology for grounding grids.
What are its characteristics? It must first meet the following conditions:

(1) Good electrical conductivity, the lowest possible resistivity, and does not affect the original grounding resistance value of the grounding grid in use
.

(2) Good anti-corrosion performance, strong anti-corrosion ability to acids and alkali salts
.

(3) The construction is simple, it has a certain mechanical strength, the price is moderate, and it can form a production mode of special anti-corrosion steel for factory processing
.

No.
3 Application Prospects of Conductive Anticorrosion Coatings

The anticorrosion treatment of grounding grid is a hidden market with huge potential
.
At present, the anti-corrosion technology of increasing the cross-sectional area or mainly using zinc steel is mainly used
.

Practice has proved that these methods have been unable to fundamentally solve the problem of corrosion of the grounding grid, which has brought serious hidden dangers to the safe operation of the power system
.
Compared with traditional anti-corrosion technology, it has the following advantages:

1.
Low resistivity and strong corrosion resistance can fully satisfy its long-term safe operation on the premise that the grounding resistance of the grounding grid does not increase
.

2.
The construction is simple, the price is moderate, the effect is remarkable, it is easy for users to accept, and it is conducive to large-scale promotion and use
.

3.
The production cost is low, and a large profit margin can be obtained
.

4.
If the extrusion process can be introduced and the original rust removal equipment can be used, a simple processing line can be built, and the special anti-corrosion steel for the formed grounding grid can be directly provided to the customer, and the thickness of the anti-corrosion layer can be selected arbitrarily
.
The welding part of the grounding grid can also be subjected to simple secondary anti-corrosion treatment on site
.

5.
In addition to the anti-corrosion of the grounding grid, the conductive anti-corrosion coating can also be used for the anti-corrosion of the casing of the underground box, the anti-corrosion of the underground cable, the anti-corrosion of the underwater buildings of the hydropower plant, the anti-corrosion of the foundation of the line tower and the anti-corrosion of the intermediate welding place, etc.

.

At the same time, it can also be used in the facilities of petroleum, chemical, highway, railway, telecommunications and other departments that need special anti-corrosion treatment (referring to the facilities that maintain the original metal conductivity), which shows that its potential market is quite large
.

Summarize

To sum up, the use of conductive anti-corrosion paint as a new anti-corrosion measure for grounding grids, or the use of conductive protective paint and a "double protection method" of physical resistance reducing agents, will fundamentally solve the serious corrosion problem of grounding grids
.
Therefore, from another point of view, it is also a field "regeneration" in the field of grounding grid anticorrosion
.

Therefore, we can also believe that the application of conductive anti-corrosion coatings will also change our traditional design concepts and ultimately bring immeasurable economic and social benefits to the power system
.