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The Corrosion Behavior of 13Cr and Super 13Cr Stainless Steel in CaCl2 Completion Fluids

Author: LiuKeBin
Tutor: GuoXingPeng
School: Huazhong University of Science and Technology
Course: Applied Chemistry
Keywords: 13Cr stainless steel Super 13Cr stainless steel Completion fluid CO2 SCC Dissolved oxygen Acetic acid
CLC: TG174.3
Type: Master's thesis
Year: 2007
Downloads: 234
Quote: 2
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Abstract


The main purpose of this thesis is the study of dissolved oxygen in order to clarify the 13Cr steel and super 13Cr stainless steel containing CO 2 completion fluids saltwater environment , temperature, salt concentration and strain their SCC strain with acetic acid content of SCC and the sample in the presence or absence of a distinction between the corrosion under the conditions of the electrochemical behavior . Paper with a four-point bending method , U -shaped loop test , surface analysis and electrochemical techniques ( potentiostatic polarization , fast / slow potentiodynamic polarization and electrochemical noise ) focused on temperature , strain , DO content and acetate two metals corrosion behavior of the material under the strain and strain conditions . 13Cr stainless steel findings : 13Cr stainless steel in deaerated 33wt ? The Cl 2 brine at 100 ° C and 150 ℃ mainly produce uniform corrosion and pitting . Deoxygenated 33wt ? Cl 2 brine at 100 ° C and 150 ℃ mainly produce uniform corrosion and cracks . Acetate added accelerated 13Cr stainless uniform corrosion , and the corrosion rate increased with the increase in its concentration ; acetate without deaerator conditions can accelerate pitting development , while in the deaerator under conditions inhibiting crack development trend . The system temperature was increased to also promote the corrosion rate of a 13Cr stainless . The electrochemical test results and the test results of the hanging piece consistent electrochemical noise confirmed by 13Cr steel under the conditions of the study will be within a very short time Germination pitting . The results show that of the super 13Cr stainless steel : acetic acid can increase the super 13Cr steel in does not to deaerator 33 wt% CaCl 2 saline susceptibility to SCC ; deaerator conditions acetate was able to reduce the super 13Cr steel susceptibility to SCC . The SEM morphology diagram shows super 13Cr steel in 33 wt% CaCl brine 1.0MPa CO 2 2 and under the conditions of 150 ° C along the crystalline form of the SCC . Super 13Cr steel Deaerator 33 wt% CaCl 2 brine 1.0MPa CO 2 and under the conditions of 150 ℃ , when the presence of acetic acid passivation ability to significantly reduce . Potentiostatic polarization and potentiodynamic polarization curve test results confirmed that the super 13Cr steel the SCC originated in the second activation - passivation anodic dissolution of the transformation zone .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Corrosion testing and equipment
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