Anti-corrosion coatings can be divided into corrosion-resistant coatings, which require acid or alkali resistance, and acid and alkali resistance can be alternated or performed simultaneously. The pH value of the corrosion medium can be corroded from 1 to 12. The coating has low alkali resistance, acid aging resistance and good adhesion of the anti-corrosion layer.

The anti-corrosion principle of anti-corrosion coating mainly includes three aspects: electrochemical action, chemical principle and physical principle.

Anti-corrosion coatings are widely used in modern industry, transportation, energy, marine engineering and other departments. According to the corrosion resistance and application requirements of its coating, it is usually divided into regular type and heavy-duty type. Conventional anti-corrosion coatings play an anti-corrosion effect on metals and protect the service life of non-ferrous metals under normal conditions; heavy-duty anti-corrosion coatings refer to anti-corrosion coatings that can be used in relatively harsh corrosive environments and have a longer protection period than conventional anti-corrosion coatings.

Since the 1990s, a new generation of anti-corrosion coating systems has gradually occupied the mainstream of market research and application. Environmentally friendly anti-corrosion coatings such as water-based epoxy and water-based acrylic have appeared one after another, enriching the types of anti-corrosion coatings and gradually developing towards multi-functionality.

At present, my country's anti-corrosion coatings are developing in the direction of high performance, efficiency, low energy consumption and low pollution

Acid and alkali-resistant anti-corrosion coatings greatly improve anti-corrosion performance and excellent anti-corrosion technical performance due to alternate anti-corrosion, which can not only meet the anti-corrosion requirements in corrosive environments, but also meet the requirements of alternate performance fatigue. Technical indicators should be formulated according to different anti-corrosion and corrosive environmental conditions, such as chemical resistance, salt water resistance, salt spray resistance, damp heat resistance, oil resistance, mildew resistance, atmospheric aging resistance, alkali resistance, potassium resistance, salt water corrosion resistance, etc. In addition, acid- and alkali-resistant anti-corrosion coatings should have good adhesion to the substrate, and the coating film should have good physical and mechanical properties, such as low shrinkage, appropriate hardness, toughness, abrasion resistance and temperature resistance. Acid and alkali resistant anti-corrosion coatings can be used in harsh conditions and have good durability and weather resistance. They can be used for more than 5 years or more than 15 years in harsh conditions such as marine and underground, and can be used for more than 3 years under certain temperature conditions even in acid, alkali, salt and solvent media.