Characterization of film properties on the Ni Cr Mo Alloy C-2000

Abstract

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The Kinetics of Nucleation of Metastable Pits on Metal Surfaces: The Point Defect Model and Its Optimization on Data Obtained on Stainless Steel, Carbon Steel, Iron, Aluminum and Alloy-22

“…It has been demonstrated previously [41][42][43] that the PDM can readily explain the observations of the passive state on Alloy-22. Characterization work 41,[44][45][46] has demonstrated that the passive film on Alloy-22 has a distinct layered structure with the inner layer primarily comprising Cr(III) oxide, so it is assumed in the optimization that point defective Cr 2 O 3 is the principal composition of the barrier layer. Fig.…”

Nickel hydroxides and related materials: a review of their structures, synthesis and properties

“…On the basis of the XPS peak shapes and positions, the hydroxide layer is assessed to be α-Ni(OH) 2 [179]. Ni(OH) 2 is also a common component of the passive layers and corrosion deposits on Ni metal [176,180,181] and Ni-containing alloys [182,183] that form in alkaline (e.g. [176]) and neutral media (e.g.…”

“…[176]) and neutral media (e.g. [183]). Ni(OH) 2 also forms electrochemically on Ni electrodes in alkaline media, which has importance for the development of Ni-based electrocatalysts [23,105,179,[184][185][186][187].…”

Effect of Oxide Film Properties on the Kinetics of O2Reduction on Alloy C-22

“…[37][38][39] In region (2), a Cr III oxide barrier layer developed and thickened as the potential was increased, accompanied by the segregation of Mo, and to a lesser degree W, to the outer regions of the film. 1,31 The current observed on the negative-going scan depended on the potential limit of the preceding positive-going scan. The O 2 reduction current was larger if the potential had been scanned into the transpassive region, region 3 (0.9 V), than if the scan was reversed in the passive region (0.1 V), Figure 1b density observed after the potential was extended to 0.9 V showed that O 2 reduction was revived to some degree on the surface after reactivation in the transpassive region.…”

“…We have previously characterized the evolution of film composition as a function of potential on Alloy C-22 (Ni-23Cr-13Mo-3W-3Fe) 30 and as a function of potential and temperature on Alloy C-2000 (Ni-23Cr-16Mo-1.6Cu). 31,32 In this study, the kinetics of O 2 reduction have been studied using a range of electrochemical techniques. Potentiostatic polarizations and cyclic voltammetry were performed in both oxygenated and deoxygenated 5 M NaCl solutions over different potential ranges, including both the passive and transpassive regions at 70…”