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Study on the SCC Behaviors of X80 Pipeline Steels in Ku’erle Soil Simulated Solution

Author: XiaoJun
Tutor: WuMing
School: Liaoning University of Petroleum \u0026 Chemical Technology
Course: Materials Processing Engineering
Keywords: X80 pipeline steel Carbon dioxide Welded joints Simulated solution Stress corrosion cracking
CLC: TG172
Type: Master's thesis
Year: 2010
Downloads: 107
Quote: 0
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Abstract


In recent years, with the increasing energy demand of China's economic development , China's oil and gas pipeline construction has been booming . Long-distance , large-diameter , high pressure is a new trend in pipeline construction , pipeline security is important . The stress corrosion cracking (SCC) in the soil environment is one of the important factors that endanger the safety of oil pipelines . Therefore very necessary to study in Korla soil environment in stress corrosion behavior of X80 pipeline steel . Potentiodynamic and AC impedance techniques to study the electrochemical corrosion behavior of X80 pipeline steel and welded joints in Korla soil simulated solution the different CO 2 partial pressure on the electrochemical corrosion behavior the impact . The results show that the polarization curves of X80 pipeline steel and its welded joints in the of Korla soil simulation solution with typical active dissolution characteristics . With CO 2 partial pressure decreases , the increased polarization curves polarization resistance (Rp), corrosion current density decreases ( icorr ) , corrosion rate decreases . Using slow strain rate test (SSRT) and scanning electron microscopy to study the stress corrosion behavior of X80 pipeline steel welded joints in Korla soil simulation solution analysis of different CO 2 partial pressure of SCC the impact . The test results show that the soil simulation solution in Korla , the sample fractography in cathode potential conditions was quasi- cleavage fracture , The specimen fracture ductile fracture in the corrosion potential and the anode potential conditions . With the the plus potential negative shift , break time , the section shrinkage , elongation significantly reduced and increased susceptibility to SCC of X80 pipeline steel and welded joints . Cathodic polarization , the cracking mechanism of SCC of X80 pipeline steel in of Korla soil simulation solution for the hydrogen-induced rupture (HIC). The same applied potential is applied , the welded joints than the base metal stress corrosion susceptibility increases weld or HAZ at the fracture position all fall . CO 2 partial pressure increases significantly enhanced susceptibility to SCC of X80 pipeline steel and welded joints .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Various types of metal corrosion
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