In modern industrial production and daily life, guardrails are widely used in roads, bridges, factories, schools and other fields as an important safety protection facility. In order to improve the corrosion resistance of guardrails, extend their service life and beautify their appearance, guardrails are usually surface treated.
In this article, Yu Jinxiang Xiaobian will introduce four common guardrail surface treatment methods in detail: plastic dipping, plastic spraying, hot-dip galvanizing and cold-dip galvanizing, and analyze their differences and their respective advantages.
1. Plastic dipping
Plastic dipping is a method of melting plastic powder and attaching it to the surface of a metal workpiece by heating.
The specific process is to preheat the metal workpiece to a certain temperature, then immerse it in a container filled with plastic powder, so that the plastic powder melts and is evenly coated on the metal surface, and finally cools and solidifies to form a layer of plastic coating.
--Advantages
- Strong weather resistance: The guardrail after plastic dipping has good weather resistance and can be used for a long time in outdoor environments without fading or damage.
- Good anti-corrosion performance: The plastic coating can effectively isolate air and moisture, and prevent the metal substrate from rusting and corrosion.
- Beautiful appearance: The plastic-dip layer can be mixed into various colors as needed, and the surface is smooth and flat, with good visual effects.
- Relatively low cost: The plastic-dip process is relatively simple, the material cost is also low, and it is suitable for large-scale production.
2. Plastic spraying
Plastic spraying is a method of spraying plastic powder onto the surface of the workpiece using high-voltage electrostatic equipment, and then curing the powder into a film through high-temperature baking.
First, the plastic powder is evenly sprayed on the metal workpiece through a spray gun; then, the sprayed workpiece is sent to the oven for high-temperature baking to melt the powder and solidify it on the metal surface.
- Advantages
- Environmentally friendly and pollution-free: No diluent is required during the plastic spraying process, which reduces the volatilization of organic solvents and is environmentally friendly.
- Strong adhesion: Due to the use of electrostatic adsorption technology, the plastic powder can be firmly attached to the metal surface and is not easy to fall off.
- Wear-resistant and corrosion-resistant: The plastic spraying layer has high hardness and wear resistance, and can effectively resist the erosion of the external environment.
- High construction efficiency: The plastic spraying process can achieve rapid painting and shorten the production cycle.
3. Hot-dip galvanizing
Hot-dip galvanizing is the process of immersing steel components in molten zinc liquid to attach a layer of zinc to their surface. This layer of zinc not only protects the steel substrate from corrosion, but also enhances the mechanical properties of the material.
-Advantages
- Strong anti-corrosion ability: The zinc layer can provide excellent anti-corrosion performance and maintain a long service life even in harsh environments.
- Good durability: The galvanized layer has high hardness and toughness, and can withstand large mechanical stress without being easily damaged.
- Wide application: Hot-dip galvanizing is suitable for various types of steel products, such as power towers, communication towers, railways, highway protection and other fields.
- Low maintenance cost: Due to its excellent anti-corrosion performance, hot-dip galvanized guardrails require almost no additional maintenance costs during use.
4. Cold galvanizing
Cold galvanizing is a method of depositing a layer of zinc on steel components through electrolytic equipment. Unlike hot-dip galvanizing, cold galvanizing is carried out at room temperature, hence the name "cold" galvanizing.
--Advantages
- Good environmental performance: The solvents and diluents used in the cold galvanizing process do not contain highly toxic organic solvents, which reduces the volatilization of organic solvents and is beneficial to environmental protection.
- Lower cost: Compared with hot-dip galvanizing, cold galvanizing has a lower cost and is suitable for some occasions where anti-corrosion requirements are not particularly high.
- Flexible construction: Cold galvanizing can be operated in a smaller space and is suitable for some workpieces of special shapes.
- Beautiful appearance: The surface of the cold galvanized layer is smooth and delicate, and has a certain decorative effect.
Which surface treatment method to choose depends on the specific application requirements and budget.
If extremely high corrosion resistance is required, hot-dip galvanizing may be the best choice;
If environmental protection and cost-effectiveness are emphasized, cold galvanizing or plastic spraying may be more suitable;
And plastic dipping is suitable for scenes that require good decorative effects and certain anti-corrosion performance.
No matter which method is chosen, it should be ensured that the quality after treatment meets the relevant standards to ensure the safety and service life of the guardrail.
