Metal corrosion has brought huge economic losses to countries around the world. According to data published by the United States, Japan, Canada and other countries, the direct economic losses caused by corrosion account for approximately 10% of the national economy. It is estimated that about 20% of the metal materials in the world cannot be recycled due to corrosion. Therefore, metal corrosion and protection issues have attracted widespread attention from countries around the world.
In my country, the annual economic losses caused by metal corrosion account for about 4% of the gross national product, and corrosion losses exceed the sum of fires, wind disasters and earthquakes. For a long time, in order to reduce corrosion losses, people have taken many measures, such as metal electrochemical protection methods, corrosive medium treatment methods, covering layer protection methods, etc., but so far the most common, most economical, and most practical protection measures are coatings Protect.
Coating anti-corrosion is widely used because of its convenient construction, economical application, no site restrictions and certain decorative properties. At present, solvent-based coatings are often used as anti-corrosion coatings on ordinary metal surfaces. However, the VOCs and heavy metals in them have caused serious environmental pollution problems. At the same time, the flammable and explosive characteristics of solvents have brought safety to the environment. Hidden danger. With people’s increasing awareness of environmental protection, water-based coatings have become the main development direction in the coating field.
The research on coatings should develop in the direction of water-based, high solid differentiation, high performance and functionalization. Environmentally friendly coatings (or green coatings) are people’s common expectation. Among water-based anti-corrosion coatings, water-based epoxy anti-corrosion coatings have become the focus of research in water-based coatings due to their outstanding anti-corrosion properties.
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