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Study on the Corrosion Behavior of Oil Pipeline Steels in Carbon Dioxide and Hydrogen Sulfide Solution

Author: WangDan
Tutor: WuMing
School: Liaoning University of Petroleum \u0026 Chemical Technology
Course: Oil and gas engineering
Keywords: Oil pipeline H2S CO2 Stress corrosion cracking Hydrogen permeation
CLC: TG172
Type: Master's thesis
Year: 2010
Downloads: 253
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Abstract


In recent years, with the continuous development of China's oil and gas fields and pipeline technology has also been a rapid development. Facing the high-sulfur, high water content, a wide range of corrosive media, the majority of our oil fields, the oil pipeline steel corrosion aggravating. Crude oil is often the phenomenon of coexistence of a variety of media, so that the impact of the pipeline steel corrosion factors become complicated. Corrosion under the conditions of a single medium, the country has entered the in-depth research and data accumulation, but H 2 S CO 2 , Cl , - stress corrosion cracking and hydrogen permeation behavior of pipeline steel, etc. under a variety of media coexistence conditions are relatively backward. Therefore, the system oil pipeline steel in H 2 S, the CO 2 Cl - the coexistence conditions under the corrosion law and mechanism of, in order to ensure security and reliable operation of the pipeline steel has important practical significance. 15 # steel as the object of study, the use of electrochemical experiments, slow strain rate tensile tests (SSRT) as well as hydrogen permeation experiments, 15 # steel the H 2 S, CO 2 , Cl - the coexistence conditions under the stress corrosion cracking and hydrogen permeation behavior. Experimental results show that the polarization curves can be seen 15 # steel in the electrochemical behavior of the experimental medium only showed activation dissolved without the active - passive transition region. As can be seen by the AC impedance results from the NaCl - CO 2 solution of NaCl - the CO 2 -H < sub> 2 S solution and then NaCl - H 2 S solution, electrochemical impedance spectroscopy of high-frequency capacitive arc diameter becoming smaller and smaller, corrosion The current density is growing faster and faster, the corrosion rate. As can be seen by the hydrogen permeation experiments, the concentration of hydrogen in the surface of the material to hydrogen induced cracking (HIC) has a close relationship, into the greater the hydrogen concentration of the metal inside the material the greater the probability of hydrogen-induced cracking occurs. H 2 S poisoning effect, and Cl - CO 2 inhibition of the H 2 The stronger the degree of inhibition of S, 15 # steel in NaCl - H 2 S solution of hydrogen permeation behavior of hydrogen bubbling the most serious, steady-state hydrogen permeation current P ∞ and susceptibility to hydrogen embrittlement. Slow strain rate tensile test results show that, when added to the solution H 2 S, the coefficient of the fragility of the material, stress corrosion cracking sensitivity has increased, but when the medium CO 2 these parameters, but declined. The corrosion potential, 15 # steel the NaCl solution NaCl - the CO 2 the solution NaCl-CO 2 -H 2 S solution and NaCl-H 2 S solution elongation, reduction gradually decreases, the the fracture time and brittle coefficient of gradually increasing the stress corrosion cracking susceptibility increasing experimental results, more prone to cracking, experimental results and electrochemical hydrogen permeation

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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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