scholarly journals Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing Steel

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5575
Author(s):  
Xiaoguang Sun ◽  
Huaiyun Cui ◽  
Zhong Li ◽  
Renyang He ◽  
Zhiyong Liu ◽  
...  
Keyword(s):  
Partial Pressure ◽  
Water Content ◽  
Corrosion Behavior ◽  
Electrochemical Corrosion ◽  
Environmental Parameters ◽  
Electrochemical Measurement ◽  
Immersion Test ◽  
Corrosion Medium ◽  
Electrochemical Corrosion Behavior ◽  
Diffusion Of Hydrogen

The corrosion behavior of L80 casing steel was studied in a simulating annulus environment using the electrochemical measurement method, immersion test, and tensile test under a high-temperature and high-pressure H2S/CO2 environment. The partial pressure of CO2 (PCO2), the partial pressure of H2S (PH2S), water content, and preloading stress remarkably affected the corrosion behavior of L80 steel. The influence of PCO2 on stress corrosion cracking (SCC) susceptibility has an inflection point of approximately 1.1 MPa. The SCC susceptibility reaches the maximum when the PCO2 is about 1.1 MPa. The SCC susceptibility has a positive correlation to PH2S and water content. The higher water content of the corrosion medium can increase the electrical conductivity of the corrosion medium and promote the corrosion of L80 steel, which can improve the diffusion of hydrogen into steel and promote the SCC of L80 steel. Preloading stress can promote local corrosion, thereby promoting SCC of steel under stress. The dislocation emergence point caused by preloading stress can accelerate the diffusion of hydrogen into steel and increase SCC susceptibility.

The Electrochemical Corrosion Behavior of HVOF Sprayed Coatings

2000 ◽  
Author(s):  
A.J. Sturgeon ◽  
D.C. Buxton
Keyword(s):  
Corrosion Behavior ◽  
Thermal Spraying ◽  
Electrochemical Corrosion ◽  
Immersion Test ◽  
Corrosion Performance ◽  
Hvof Spraying ◽  
Electrochemical Testing ◽  
Electrochemical Corrosion Behavior ◽  
Immersion Testing ◽  
Sprayed Coatings

Abstract Thermal spraying of corrosion resistant alloys onto low alloy steel substrates has received much attention as a method to protect against corrosion in seawater or corrosive solutions, such as mineral or organic acids. The need to ensure high coating quality with minimal porosity and cracking, and with low oxide levels is best achieved in metallic alloys using the high velocity oxyfuel (HVOF) spraying process. This article investigates the electrochemical corrosion behavior of HVOF sprayed coatings, covering coating preparation and characterization, immersion testing, and electrochemical testing. The discussion provides information on immersion test results, polarization plots for coatings, comparison of corrosion performance, influence of microstructure on corrosion performance, and comparison with bulk alloy materials. The results reported in this article have been selected to demonstrate the use of the cyclic potentiodynamic polarization method to rank the corrosion performance of HVOF sprayed Ni-alloy coatings.

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