Asphalt is one of the important anti-corrosion coatings. In particular, coal tar pitch is the best. Coal tar pitch paint is cheap and has the following advantages: ①Water resistance, its water absorption rate is only 0.1%～0.2% after immersed in water for 10 years; ②Resistant to some chemical media; It still has good wettability on the steel surface that is not fully derusted; ④The solid content is high and thick film can be obtained; ⑤The price is low. The disadvantage is that it is brittle in cold winter and soft in summer heat. After exposure to the sun, some components volatilize and escape, which will cause paint film to crack. These shortcomings can be improved by adding some other resins. For example, adding chlorinated rubber can improve the dryness of asphalt coatings and improve the shortcomings of softness in winter and softness in summer; epoxy asphalt coatings made by adding epoxy resin can have the advantages of asphalt coatings and epoxy coatings, and are obtained in anti-corrosion Very satisfactory results. Asphalt coatings have been used on container bottoms, ship bottoms, dock gates, cofferdams and other occasions, with good anti-corrosion effects.
Heavy anti-corrosion coatings are relative to general anti-corrosion coatings. It refers to an anti-corrosion coating whose anti-corrosion effect is several times higher than that of general corrosion coating under severe corrosive conditions. It is characterized by excellent resistance to strong corrosive media, outstanding durability, and a service life of more than several years. Mainly used in marine structures and chemical equipment, storage tanks and pipelines.
