... or temperature, is on the increase. ASTM G61 also establishes the repassivation potential as the potential is decreased. In this study, ASTM G150 is extended to define the repassivation temperature for a decreasing temperature. The “unified” approach was utilized to identify the transition of a material from...

... and aggressive process environments. For this purpose, the model calculates the corrosion rates, corrosion potential and repassivation potential as a function of temperature, alkalinity, pH, partial pressure of gases (including H₂S), and concentrations of various aggressive species. The corrosion...

... provide a mechanism of the role of alloying elements to localized corrosion inhibition. Therefore, electrochemical techniques were utilized to obtain characteristic potentials (breakdown potential and repassivation potential) and temperature (protection temperature) for various alloys in chloride solution...

... in contact with the aluminum alloy, ² which could act as initiation sites for crevice corrosion. Crevice corrosion of AA 5052 was studied in seawater with artificial crevice formers at room temperature. ³¹ For a 3.0 wt% NaCl solution, the crevice repassivation potential was -0.960...

... is the repassivation potential for localized corrosion of the material of interest. Corrosion resistant alloys (CRAs) have been widely used in the oil and gas production environments where low alloy steels typically have lower chance to withstand the corrosive conditions. It is highly likely that SCC of CRAs only...

... in pits. The purpose of this paper is to review the progress in these areas with a particular focus on the relationship between localized chemistry and repassivation potential. The paper discusses the results of different reactive-transport modeling approaches in understanding local chemistry changes...

...Abstract A modeling framework has been developed for rationalizing and predicting localized corrosion of corrosion-resistant alloys in environments that contain hydrogen sulfide and chlorides. The framework relies on the computation of the repassivation potential and corrosion potential...

... of the repassivation potential, which defines the threshold condition for the existence of stable pits or crevice corrosion. An alloy is susceptible to localized corrosion if the corrosion potential exceeds the repassivation potential. Furthermore, experimental evidence indicates that the repassivation potential also...

... assessment of the considered mechanisms to account for the observed effectiveness of the inhibitors. Alloy 22 chloride inhibitors crevice corrosion repassivation potential INTRODUCTION Crevice corrosion is a form of localized corrosion that may occur in occluded metallic surfaces where a stagnant...

... corrosion resistance of nickel based alloys UNS N06625, N06022, N07022 and N10362 was tested in 5 mol/L CaCl₂ solutions at temperatures ranging from 20 °C to 100 °C. The repassivation potential of each alloy linearly decreased with temperature. The crevice corrosion resistance of the alloys...

... base alloys, namely N06625, N06030, N06035, N06022, N07022 and N10362. The crevice corrosion repassivation potential (E_R,CREV) of the tested alloys was determined by the Potentiodynamic-Galvanostatic-Potentiodynamic method. The testing temperature was 60°C and the chloride concentrations...

... inhibitors of crevice corrosion of alloy 22. A modification of the THE method (ASTM G 192) was used for determining the crevice corrosion repassivation potential of alloy 22 in chloride plus inhibitor solutions at 90°C. The species tested as inhibitors were nitrate, sulfate, carbonate, bicarbonate, chromate...

...Potentiodynamic-Galvanostatic-Potentiodynamic (PD-GS-PD) tests The PD-GS-PD test is a novel method for determining the crevice corrosion repassivation potential proposed by Mishra and Frankel. ²⁷ It consisted of three stages: (1) a potentiodynamic polarization (at 0.167 mV/s...

... of phosphate ions on chloride induced crevice corrosion of Alloy 22. Localized corrosion N06022 repassivation potential inhibition phosphates INTRODUCTION Alloy 22 (UNS N06022) is a nickel based alloy which contains a high concentration of chromium (22%) and belongs to the Ni-Cr-Mo-W family of alloys...

... of the potential Yucca Mountain repository. The simulation results indicate that for both brines, a sufficiently high positive difference between corrosion and repassivation potentials is needed for sustained propagation of crevice corrosion. localized corrosion dust deliquescence brines repassivation potential...

... of the different weak acids. N06022 organic acids oxalic acetic citric picric corrosion rate crevice corrosion inhibition repassivation potential INTRODUCTION Alloy 22 (N06022) is a nickel base alloy which contains by weight approximately 22% chromium (Cr), 13% molybdenum (Mo), 3% tungsten (W...

...) corrosion was performed as well as determination of Tafel slopes in the studied environments. Repassivation potentials were obtained from cyclic poten-tiodynamic polarization tests. Results indicate that MA and TCP material show similar general corrosion rates and crevice corrosion resistance in the tested...

...Abstract Repassivation potentials of stainless steels and nickel-base alloys have been investigated in aqueous environments containing chloride ions as aggressive species and selected oxyanions as inhibitive species. An extensive database of repassivation potentials has been established for six...

... containing environments, they are therefore susceptible to localized corrosion. In this paper, the susceptibility of selected Cu-Ni alloys (UNS C70600, UNS C71500 and UNS N04400) to localized corrosion was investigated by measuring the crevice stabilization and repassivation potentials...

... parameter below which localized corrosion does not occur has been discussed by Sridhar and Cragnolino ³¹ . They established that pitting repassivation potential (E_RP) is independent of previous pit growth if the circulated anodic charge density is higher than a certain threshold value...