In corrosive environments, the inner wall of the coupling is highly susceptible to corrosion, leading to failure of the sealing performance and the detachment of the oil pipe. To prevent this phenomenon, our company has developed an epoxy resin powder coating coupling, where the inner wall of the coupling is evenly coated with epoxy resin powder. This coating offers excellent performance, with high resistance to heat, wear, and corrosion, effectively alleviating the corrosion on the inner wall of the coupling during oil extraction, thereby extending the service life of the coupling and improving extraction efficiency.