Determination method for control effect of corrosion inhibitor on welding seam corrosion of oil gas pipeline

• Main Authors: CUI LEI, YIN MINGXUE, DU LEI, DU TAO, LU WEITING, ZHENG CHU, LIAO YUN, ZHANG JINZHONG, SHI DAIYAN, LI TIANLEI, LI LINHUI, MA XIAN
• Format: Patent
• Language: Chinese; English
• Published: 06.06.2017
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a determination method for a control effect of a corrosion inhibitor on welding seam corrosion of an oil gas pipeline. A welding connector material of the oil gas pipeline is made into a working electrode of an electrochemical testing system: the welding connector material is divided and cut into four regions including a parent metal region, a near-thermal influence region, a far-thermal influence region and a welding seam; a pipeline inner wall surface of the obtained material is used as a working surface of the working electrode and other surfaces are non-working surfaces; the back of the working surface is connected with an electric lead wire with an insulating sheath through tin soldering; then the non-working surfaces and a tin soldering point are covered and sealed by epoxy resin and only the working surface of the electrode is exposed; the electrochemical testing system with the current induction precision of +/-100nA to +/-1A and the minimum current resolution rate of 1nA is us