The main purpose of thermal spraying zinc wire on galvanized welded pipes is to repair and enhance the
anti-corrosion performance. Although the surface of the galvanized welded pipe already has a layer of
zinc coating, in some cases, especially during production, processing or use, this layer of zinc coating may be
damaged, resulting in a decrease in the anti-corrosion performance of the pipe. The following are the specific
roles of thermal spraying zinc wire on galvanized welded pipes:
1. Repair the damage of the galvanized layer
During welding, cutting or processing, the galvanized layer may be damaged, exposing the steel substrate of the
pipe. These exposed areas are very susceptible to corrosion. By using thermal spraying zinc wire technology, the
galvanized layer can be quickly repaired, covering the damaged parts and preventing further development of
corrosion.
2. Enhanced anti-corrosion performance
Even an intact galvanized layer may gradually be corroded or oxidized during long-term use. Thermal spraying
zinc wire can form an additional zinc layer on the basis of the galvanized layer, thereby enhancing the overall
anti-corrosion performance of the pipe and extending its service life. Especially in harsh environments
(such as humidity, chemical plants, etc.), the additional zinc spray layer can significantly improve the corrosion
resistance of the pipe.
3. Increase the thickness of the zinc layer
Thermal spraying can increase the thickness of the zinc layer on the surface of the pipe, which is very important for
some application scenarios that require enhanced protection. For example, in marine or industrial environments,
due to the high corrosive components in the air, a thicker zinc layer is required to prevent corrosion of the steel
pipe.
4. Improve the protection of welding points
When welding galvanized welded pipes, the galvanized layer around the welding points may be destroyed due to
high temperature, causing the steel in these areas to be exposed to the air and prone to corrosion. By thermally
spraying zinc wire on the welding points, these vulnerable parts can be re-covered to prevent corrosion and ensure
the overall durability of the pipeline.
5. Electrochemical protection
Zinc has a low electrochemical potential. When it comes into contact with steel, it will corrode first, thereby acting
as a sacrificial anode to protect the steel from corrosion. Thermally sprayed zinc wire can provide an additional
sacrificial anode layer for galvanized welded pipes, further improving the corrosion resistance of steel pipes.
Conclusion
In general, thermal spraying of zinc wire on galvanized welded pipes is mainly used to repair coating defects and
enhance corrosion resistance, especially at welding points, processed areas or environments that require higher
protection requirements. Through this process, the service life of the pipe is significantly extended and can
effectively cope with various corrosive environments.
