In public facilities projects such as urban road lighting, traffic signals, communication base stations, and power poles, steel pole structures are used as basic support parts and are exposed to harsh environments such as wind, sun, rain, snow, and even industrial waste gas and salt spray for a long time. The quality of surface anti-corrosion treatment directly determines the service life and subsequent maintenance cost of steel poles.
Common surface treatment methods for steel poles mainly include hot-dip galvanizing, plastic spraying, painting, and fluorocarbon coating. Different processes have their own characteristics in terms of anti-corrosion effect, cost investment, and service life. This article will compare the weather resistance performance and applicable suggestions of different treatment methods in combination with the actual use environment, so as to help suppliers and engineering parties make more scientific decisions when selecting.
1. Hot-dip galvanizing: a cost-effective basic anti-corrosion method
Hot-dip galvanizing is to immerse the steel pole in molten zinc liquid to form a metallurgical bonding layer between the zinc layer and the steel surface, which has good anti-corrosion ability and adhesion.
Corrosion resistance
Generally between 15 and 30 years, depending on the thickness of the zinc layer (commonly 85μm~120μm) and the environment.
In coastal areas, salt spray or acid rain areas, it is recommended to increase the thickness of the zinc layer or superimpose other protective layers.
Advantages
Mature process, low mass production cost
Silver-gray surface, uniform texture, suitable for most public projects
Even if the surface is scratched, it can still continue to prevent corrosion through the "sacrificial anode" effect of zinc
Application scenarios
Municipal street light poles, ordinary communication poles, power brackets, highway guardrail columns, etc.
2. Plastic spraying: double improvement of aesthetics and weather resistance
Process introduction
On the basis of hot-dip galvanizing, epoxy powder or polyester powder is evenly sprayed on the surface of the steel pole through an electrostatic spraying process, and a plastic protective film is formed by high-temperature curing.
Corrosion resistance
The corrosion resistance of a single layer of plastic spraying is 10 to 15 years
If combined with hot-dip galvanizing as a "double coating", the corrosion resistance can be increased to more than 20 years
Advantages and characteristics
Rich colors (off-white, dark gray, dark green, black, etc. can be customized)
Enhance surface wear resistance and UV resistance
Improve the integrity of the anti-rust layer, suitable for high-standard aesthetic places
Application scenarios
Urban landscape lighting poles, commercial area signal light poles, intelligent monitoring towers, traffic induction facilities, etc.
3. Spray painting process: flexible and economical, suitable for light corrosion protection scenarios
Process introduction
Use manual or spray gun to spray the anti-rust primer and colored topcoat in layers on the surface of the steel pole, with moderate film thickness and convenient construction.
Corrosion resistance
Generally 5 to 10 years, requiring regular maintenance and repainting
In high humidity and high corrosion areas, it is recommended to avoid using spray paint alone as the main protective means
Advantages and characteristics
Flexible colors, suitable for customized patterns, logos or LOGO
Short construction cycle, suitable for maintenance or low-cost occasions
Optional fast drying type, suitable for on-site painting
Application scenarios
Park guide poles, non-main road lighting poles, temporary engineering facilities
Fourth, Fluorocarbon coating: the only choice for high-end projects
Process introduction
Using high weather-resistant fluorocarbon coating, a dense protective film is formed through multiple coating and baking processes, which is widely used in high-standard long-term outdoor projects
Corrosion resistance
The anti-corrosion life can reach 25~30 years or even longer
The coating can still maintain integrity and color stability under long-term exposure and rain erosion
Advantages and characteristics
Strong resistance to UV, acid rain and powdering
Long-lasting color gloss, rarely fades
Almost maintenance-free, better life cycle cost
Application scenarios
High-end smart poles, landmark bridge lighting poles, coastal anti-corrosion areas, high-altitude environments, government key demonstration projects
