Located in Doingying City, Shandong Province, where is the headquarter of Chinese second largest oilfield - Shengli Oilfield, . Dongying CORRTECH Cathodic Protection Technology Co. consists of two departments: CORRTECH Cathodic Protection Technology Department and Exothermic Welding Research Center, and provides cathodic protection and corrosion materials and equipment, plus cathodic protection engineering services and installation services.