Maintenance method of highway wave guardrail board

The maintenance methods of highway guardrails mainly include: brushing silver powder and hot dip galvanizing.

1. Brushing silver powder: It is not very good from the actual anti-corrosion effect. Generally, it is affected by natural conditions and has a short service life. Generally, it can only be maintained for two to three years.

2, hot dip galvanizing: hot dip galvanizing generally uses No. 0 or No. 1 zinc, zinc liquid temperature is controlled between 480 ° C ~ 520 ° C, galvanizing amount of 600g / m2 or more. The purpose of using hot-dip galvanized guardrails on highways is to use zinc layers to protect the underlying corrugated fence bodies from the outside air and moisture, thus ensuring corrosion of the corrugated fence body from relevant natural conditions. To extend the life of the wave barrier.

The anti-corrosion principle of hot dip galvanizing mainly has the following aspects; a thin and dense layer of zinc oxide is formed on the surface of the zinc layer, which is difficult to be chemically reflected in water, and is difficult to dissolve in water. Therefore, it has a good protective effect on the wave shield inside. Once the steel bar is exposed or a small range of corrosion occurs due to external force, this is a galvanized protective layer which can produce a kind of iron-zinc micro-battery. The substance can be quickly incorporated into the exposed steel to form a new protective layer that continues to protect the wave barrier.

Therefore, hot dip galvanizing is an ideal anticorrosion method in the wave protection column. This is why some of our common leak plating points disappear in a short time. However, the protection of the fence by galvanizing is not permanent. It is also affected by related factors and causes corrosion. For example, daily sunshine, automobile exhaust, and rain spray have a certain corrosive effect on the galvanized layer. Therefore, different natural conditions and air conditions have a certain impact on the galvanized fence, so we must carefully analyze the relevant factors.