Aluminum and zinc spraying on the surface of steel structure anticorrosion technology, especially arc spraying is the most common application, and its application prospect is more extensive. China Painting Equipment Network (http://www.chinatzsb.cn). The principle of arc spraying anticorrosion is to use arc spraying equipment to heat, melt, atomize and spray two charged metal wires (such as zinc, aluminum, etc.) to form an anticorrosive coating, plus a long-term anticorrosive composite coating of organic closed coating. The significant characteristics of the coating are:
It has a long corrosion resistance life and its corrosion resistance life can reach more than 50 years. At the same time, the anti-corrosion coating does not need any other anti-corrosion maintenance during the 30-year service period; For maintenance after 30 years, only the sealing coating must be brushed on the arc spraying layer; No need to re-spray, to achieve a corrosion prevention, coating long-lasting effective.
The arc spraying layer and the metal substrate have excellent coating bonding force (up to 10Mp or more), and the metal spraying layer is combined with the base metal by mechanical inlay and micro-metallurgy, which can also ensure that the anti-corrosion coating does not fall off, does not peel, and is firmly combined and effective for a long time under slight bending, impact or collision, which is not achieved by any other surface anti-corrosion coating.
The principle of aluminum and zinc spraying anticorrosive coating on steel structure is cathodic protection. In corrosive environment, even if the anticorrosive coating is locally damaged, it still has the effect of sacrificing itself to protect the steel matrix. Area ratio of coating (anode) to steel substrate (cathode) ≥1; The ratio of anode to cathode of zinc-rich coating is less than 1, and its protective effect and binding force are much lower than that of arc spraying anticorrosive coating.
Second, the technical advantages of aluminum and zinc spraying on the surface of steel structure anti-corrosion
Compared with flame spraying, arc spraying uses electric energy instead of gas combustion, which greatly improves work efficiency and safety. Especially with the emergence of arc spraying mechanized equipment, arc spraying technology can fully meet the needs of bridge construction period, and the arc temperature is much higher than the flame, and the coating binding force is much higher than the flame spraying. Therefore, the coating quality can fully meet the needs of long-term anticorrosion. Due to high labor costs in the United States, the cost of using arc spraying anti-corrosion construction is even lower than that of heavy anti-corrosion paint. After decades of testing, it has been proved that spraying technology is the best method for long-term corrosion prevention of steel structures, and this conclusion has been recognized by government departments and engineering circles in many countries in the world.
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