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1-14 of 14
Keywords: activation energy
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Proceedings Papers
Electrochemical Model of CO2 Corrosion in the Presence of Quaternary Ammonium Corrosion Inhibitor Model Compounds
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...corrosion inhibitors alkyl tail length mitigation activation energy CO2 corrosion mechanistic model INTRODUCTION Internal corrosion of mild steel transportation pipelines is a major issue in the upstream oil and gas industry, due to the presence of produced water 1...
Proceedings Papers
Effect of Corrosion Inhibitor Alkyl Tail Length on the Electrochemical Process Underlying CO2 Corrosion of Mild Steel
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... of Inhibition Based on Change of Overall Activation Energy for the Corrosion Process In some studies it was suggested that the adsorption of a corrosion inhibitor can be best qualified by the effect it has on the overall activation energy for the corrosion process, 11 – 13 which is a measure...
Proceedings Papers
Temperature Effects on a Galvanic Anode-Steel in Concrete System
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.... A more refined steel cathodic polarization characterization was introduced and demonstrated by accounting for the effect of electrode potential, as an added term to the nominal activation energy of the cathodic reaction. temperature concrete corrosion resistivity activation energy INTRODUCTION...
Proceedings Papers
Effects of Temperature and Humidity on Atmospheric Stress Corrosion Cracking of 304 Stainless Steel
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... environment. On the other hand, stress dependency of the ESCC was identified at 343 °K and 333 °K. It would be mainly caused by increase in the incubation time of the ESCC by decreasing temperature. We also obtained the activation energy of the ESCC growth rate. Apparent activation energy of the average ESCC...
Proceedings Papers
Influence of Minor Elements on Primary Water Stress Corrosion Cracking of Alloy 600
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...Alloy 600 weld metal stress corrosion cracking primary water SCC PWSCC titanium niobium SSRT activation energy constant-load test INTRODUCTION It is widely known that mill-annealed, nickel-base Alloy 600 is susceptible to stress corrosion cracking in primary cooling water of pressurized...
Proceedings Papers
Influence of Temperature on PWSCC Initiation and Crack Growth Rate (Susceptibility) of Alloy 600 Weld Metals
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... to specimens that had an IGSCC% (Area of intergranular or inter-dendrite fracture / Total area of fracture surface) greater than 5 %. IGSCC% of specimens with less than 5 % had relatively large scatter to evaluate the susceptibility, especially to calculate an activation energy. Figures 6 and 7 show SEM...
Proceedings Papers
On Apparent Bi-Linear Corrosion Rate Behavior of Ti Grade 7 in Basic Saturated Water (Bsw-12) below and above 80°C
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..., activation energy, and macro- and micro-surface analysis in a temperature range from 70 to 90°C. When considering the bi-linear corrosion rate behavior around 80°C, it is hypothetical that the corrosion of Ti Grade 7 below ~ 80°C is an athermal process, while above this temperature the corrosion process...
Proceedings Papers
General Corrosion Studies of Candidate Container Materials in Environments Relevant to Nuclear Waste Repository
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... Project HLW Surface Imperfections Activation Energy Abstract Alloy 22 (UNS N06022) and Ti Grade 7 (UNS R52400) have been proposed as the corrosion resistant materials for fabricating the waste package outer barrier and the drip shield, respectively, for the proposed nuclear waste repository...
Proceedings Papers
Influence of Dissolved Hydrogen and Temperature on Primary Water Stress Corrosion Cracking of Mill Annealed Alloy 600
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... of hydrogen content control was less than 10 %). As the strain rate in the SSRT test, 5×10-7 S-1 and 1×10-7 S-1 were used. Constant-load tensile tests alloy 600 MA600 stress corrosion cracking primary water SCC PWSCC dissolved hydrogen activation energy...
Proceedings Papers
Influence of Dissolved Hydrogen on Primary Water Stress Corrosion Cracking of Mill Annealed Alloy 600
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... from 0 to 4 ppm using the slow strain rate technique (SSRT). The results suggest that the susceptibility of Alloy 600 to PWSCC reaches the maximum around 3 ppm of hydrogen content with the apparent activation energy of PWSCC depends on the hydrogen content. Therefore, the hydrogen content at which...
Proceedings Papers
Mechanistic Differences in Transgranular and Intergranular Cracking of Austenitic Stainless Steels
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... SCC is about 2 to 3 times higher than transgranular SCC. Also, by studying the effect of temperature on the crack propagation rate the activation energy in both modes of cracking was found to be similar thereby suggesting that the rate limiting step in both types of cracking may be the same...
Proceedings Papers
Predictive Capabilities of the Surface-Mobility Stress Corrosion Cracking Mechanism
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... corrosion cracking surface mobility crack velocity temperature activation energy INTRODUCTION Surface Mobility Mechanism This mechanism was introduced in 1987. 1 The idea of the mechanism 1 stemmed mainly from the publications made on surface self-diffusion of metals. 2...
Proceedings Papers
Prediction of Microstructural Effect on Corrosion of Linepipe Steels in CO2-Brine Solution
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... with the corrosion rate. Steel heat-treatment microstructure carbon dioxide linepipe iron carbonate aqueous corrosion scale formation activation energy pH CO2 partial pressure stability diagram INTRODUCTION The traditional practice of avoiding condensation of an aqueous phase in pipelines...
Proceedings Papers
Physical Characteristics of Iron Carbonate Scale Formation in Linepipe Steels
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...Steel carbon dioxide linepipe iron carbonate aqueous corrosion scale formation heat-treatment activation energy pH CO2 partial pressure stability diagram INTRODUCTION Most oil and gas production has associated water production with which carbon dioxide forms weak but corrosive...