Mechanism of anticorrosive coatings

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. Corrosive medium PH value can range from 1 corrosion to 12 。This coating has low alkali and acid aging resistance, but good anticorrosion layer adhesion.

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

Anti-corrosion coatings are widely used in modern industry, transportation, energy, marine engineering and other sectors. According to their coating corrosion resistance and application requirements, they are usually divided into conventional and heavy types. Conventional anti-corrosion coatings provide anti-corrosion protection for metals, protecting non-ferrous metals under general conditions; heavy anti-corrosion coatings refer to a type of anti-corrosion coating that can be used in relatively harsh corrosive environments and has a longer protection period than conventional anti-corrosion coatings.

20 Century 90 Since the decade, a new generation of anti-corrosion coating systems has gradually become the mainstream of market research and application. Waterborne epoxy, waterborne acrylic and other environmentally friendly anti-corrosion coatings have emerged one after another, enriching the types of anti-corrosion coatings and gradually developing towards multi-functional directions.

At present, China's anti-corrosion coatings are developing towards high performance, efficiency, low energy consumption and low pollution.

Acid and alkali-resistant anti-corrosion coatings, due to alternating corrosion protection, greatly improve the anti-corrosion performance and excellent anti-corrosion technical performance, which can meet the anti-corrosion requirements under corrosive environments and the alternating performance fatigue requirements. Technical indicators should be formulated according to different anti-corrosion and corrosion environment conditions, such as chemical medium resistance, salt water resistance, salt spray resistance, damp heat resistance, oil resistance, mildew resistance, atmospheric aging resistance, alkali resistance, potassium resistance, and salt water corrosion resistance. In addition, acid and alkali-resistant anti-corrosion coatings should have good adhesion to the substrate, and the coating should have good physical and mechanical properties, such as low shrinkage rate, appropriate hardness, toughness, wear resistance and temperature resistance. Acid and alkali-resistant anti-corrosion coatings can be used under harsh conditions and have good durability and weather resistance. They can be used in harsh conditions such as marine and underground environments 5 year or 15 years or more, even in acid, alkali, salt and solvent media, can be used under certain temperature conditions 3 years or more.