The high anticorrosion coating application

The primary means of domestic and international underground natural gas pipeline corrosion is appropriate based on the pipeline the geographical terrain, topography, geological conditions, covering supplemented by cathodic protection. Used paint: petroleum asphalt, coal tar enamel, epoxy paint. Domestic buried pipeline anti-corrosion commonly used petroleum asphalt paint. If the soil environment, microbial, no serious interference with the deep-rooted plants, be regarded as an affordable anti-corrosion layer. Its flow properties are not suitable for high-temperature environment and serious pollution of the environment during the construction, its use has shown a downward trend. From a global perspective, the most widely used when push coal tar enamel and epoxy paint. The former has a strong anti-microbial corrosion, anti-plant root penetration, low water absorption, resistance to cathodic delamination, bonding wrapped solid strong on the wall, there are obvious advantages for use in the oil and gas pipeline The United States, Russia, in the large-scale use.

Pipeline coating the front surface pretreatment process

The preservative quality depends on the level of the coated front surface pretreatment method selection. The traditional degreasing rust Law of time and labor pollution is difficult to guarantee quality. In recent years the tendency to use high temperature unglazed law degreasing, the pipe loading into specially furnace at 350 ~ 400 ℃ supplemented with ventilation, insulation 3 ~ 4 h, the oil burned guarantee degreasing quality. Peening machinery instead of the traditional method of pickling. This method is the use of compressed air to carry steel shot (or sand) to form a high-speed flow of logistics strong impact on the steel surface through the nozzle of the gun to remove oil or oxide. It rust completely, but also improve the surface roughness, to increase the contact area of the wall and the coating (about 20 times), and to improve coating bond strength, can be effectively prevented deep delamination.