The infrastructure and equipment of the petrochemical industry require a large amount of steel. They are in a complex and harsh working environment, some are under high temperature and high pressure for a long time, some are in an acid corrosion environment, and some are in an ocean corrosion environment.
Petrochemical products are aggressive to many coating films. For example, crude oil can cause further corrosion, especially at the bottom of the tank. Inorganic zinc silicate and polyamide epoxy topcoat, phenolic epoxy, tar epoxy and polyester glass flake coatings have a relatively good protective effect over the corrosion in fog, splashing and immersion area.
High temperature and low-temperature resistance are common requirements in petroleum refineries. The operating temperature ranges from -29°C to 281°C. The coating options in this range include epoxy, modified epoxy, phenolic, acrylic silicone, polyurethane, inorganic zinc, silicone, glass-filled inorganics, etc. For surfaces subject to rapid changes, the coating also has to withstand thermal strikes.
The painted surface will be eroded by airborne particles. Inorganic zinc silicate coating is very hard. In the PH6-9 environment, it can be used alone, or with epoxy, acrylic, polyurethane and other topcoats.
In high humidity environments, hydrocarbon resin modified epoxy coatings, inorganic silicon acid primers, polyamide epoxy coatings and aliphatic polyurethane topcoats are often used as a supporting system, with a dry film thickness of 150-200μm.