Methods for surface protection of corrugated guardrail panels

1. Hot dip galvanizing, also known as hot-dip galvanizing or hot-dip galvanizing, is an effective method of metal corrosion prevention, mainly used on metal structures and facilities in various industries. It is to immerse the rust removed steel parts in a molten zinc solution at around 500 ℃, so that a zinc layer is attached to the surface of the steel components, thereby achieving the purpose of corrosion prevention. Hot dip galvanizing process flow: finished product pickling - water washing - adding auxiliary plating solution - drying - hanging plating - cooling - medicating - cleaning - polishing - completion of hot dip galvanizing. Hot dip galvanizing is a development of the older hot-dip galvanizing method, which has a history of 140 years since France applied hot-dip galvanizing to industry in 1836. However, the hot-dip galvanizing industry has experienced large-scale development in the past thirty years with the rapid development of cold-rolled strip steel. More than 90% of the corrugated beam steel guardrails on highways are treated with hot-dip galvanizing technology, which is anti-corrosion and scratch resistant. The zinc layer is thick and has a long oxidation resistance time, with good anti-corrosion and rust prevention effects.

2. Cold galvanizing, also known as electroplating, is the process of using electrolytic equipment to remove oil, acid wash, and then place the pipe fittings in a solution containing zinc salts. The negative electrode of the electrolytic equipment is connected, and a zinc plate is placed opposite the pipe fittings. The positive electrode of the electrolytic equipment is connected to the power supply, and the directional movement of the current from the positive electrode to the negative electrode will deposit a layer of zinc on the pipe fittings. Cold galvanized pipe fittings are processed first and then galvanized. Cold dip galvanized coatings are mainly used for corrosion prevention through electrochemical principles, so it is necessary to ensure sufficient contact between zinc powder and steel, resulting in electrode potential difference. Therefore, surface treatment of steel is very important. In theory, electroplating can reach or even exceed the thickness of the zinc layer of hot-dip galvanizing. However, in general, the thickness of the electroplating layer is generally thinner, resulting in poorer anti-corrosion and rust prevention effects compared to hot-dip galvanizing. The protection period is also shorter, and the scratch resistance effect is poor. However, the relative cost is low, and the appearance is brighter than hot-dip galvanizing.

3. Spray molding is a surface treatment method that sprays plastic powder onto parts. Spray coating, also known as electrostatic powder spraying, is a process that uses an electrostatic generator to charge plastic powder, adsorb it onto the surface of an iron plate, and then bake it at 180-220 ℃ to melt and adhere it to the metal surface. Spray coating products are mostly used for indoor boxes, and the paint film has a smooth or matte effect. Spray powder mainly includes acrylic powder, polyester powder, etc. The advantage is that there is no need for diluents, and the construction is pollution-free and non-toxic to the human body; The coating has excellent appearance quality, strong adhesion and mechanical strength; Short curing time for spray painting construction; The corrosion resistance and wear resistance of the coating are much higher; No primer required; Easy construction with low technical requirements for workers; The cost is lower than the painting process; Some construction scenarios have explicitly stated that the use of electrostatic spraying technology is necessary for treatment; During the electrostatic powder spraying process, there will be no common flowing phenomenon in the painting process. Waveform guardrails often use this technology to treat the surface. Generally, there are three ways: 1. Steel plates are directly sprayed with plastic. 2. Cold galvanized and spray coated steel plates. 3. Hot dip galvanizing and spraying of steel plates.

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