Chemical Composition, Chemical States, and Resistance to Localized Corrosion of Passive Films on an Fe‐17%Cr Alloy

1994 ◽  
Vol 141 (1) ◽  
pp. 111-116 ◽  
Author(s):  
W. P. Yang ◽  
D. Costa ◽  
P. Marcus
Keyword(s):  
Chemical Composition ◽  
Passive Films ◽  
Localized Corrosion ◽  
Chemical States

Chemical composition and electronic structure of anodic passive films on low-C 13CrNiMo stainless steel

2015 ◽  
Vol 20 (4) ◽  
pp. 1065-1074 ◽  
Author(s):  
C. A. Gervasi ◽  
C. M. Méndez ◽  
A. E. Bolzán ◽  
P. D. Bilmes ◽  
C. L. Llorente
Keyword(s):  
Stainless Steel ◽  
Electronic Structure ◽  
Chemical Composition ◽  
Passive Films

WITHDRAWN: Chemical composition and electronic structure of passive films formed on Alloy 600 in acidic solution

2008 ◽  
Vol 50 (4) ◽  
pp. 968-977 ◽  
Author(s):  
L.A.S. Ries ◽  
M. Da Cunha Belo ◽  
M.G.S. Ferreira ◽  
I.L. Muller
Keyword(s):  
Electronic Structure ◽  
Chemical Composition ◽  
Acidic Solution ◽  
Passive Films ◽  
Alloy 600

scholarly journals Atomic level characterization in corrosion studies

2017 ◽  
Vol 375 (2098) ◽  
pp. 20160414 ◽  
Author(s):  
Philippe Marcus ◽  
Vincent Maurice
Keyword(s):  
Grain Boundaries ◽  
Density Functional ◽  
Three Dimensional ◽  
Atomic Level ◽  
Passive Films ◽  
Localized Corrosion ◽  
Ex Situ ◽  
Tunnelling Microscopy ◽  
Surface Hydroxylation ◽  
Fundamental Insight

Atomic level characterization brings fundamental insight into the mechanisms of self-protection against corrosion of metals and alloys by oxide passive films and into how localized corrosion is initiated on passivated metal surfaces. This is illustrated in this overview with selected data obtained at the subnanometre, i.e. atomic or molecular, scale and also at the nanometre scale on single-crystal copper, nickel, chromium and stainless steel surfaces passivated in well-controlled conditions and analysed in situ and/or ex situ by scanning tunnelling microscopy/spectroscopy and atomic force microscopy. A selected example of corrosion modelling by ab initio density functional theory is also presented. The discussed aspects include the surface reconstruction induced by hydroxide adsorption and formation of two-dimensional (hydr)oxide precursors, the atomic structure, orientation and surface hydroxylation of three-dimensional ultrathin oxide passive films, the effect of grain boundaries in polycrystalline passive films acting as preferential sites of passivity breakdown, the differences in local electronic properties measured at grain boundaries of passive films and the role of step edges at the exposed surface of oxide grains on the dissolution of the passive film. This article is part of the themed issue ‘The challenges of hydrogen and metals’.

Chemical composition and semiconducting behaviour of stainless steel passive films in contact with artificial seawater

1998 ◽  
Vol 40 (2-3) ◽  
pp. 481-494 ◽  
Author(s):  
M. da Cunha Belo ◽  
B. Rondot ◽  
C. Compere ◽  
M.F. Montemor ◽  
A.M.P. Simões ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Chemical Composition ◽  
Artificial Seawater ◽  
Passive Films

scholarly journals Aqueous Corrosion of Aluminum-Transition Metal Alloys Composed of Structurally Complex Phases: A Review

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5418
Author(s):  
Libor Ďuriška ◽  
Ivona Černičková ◽  
Pavol Priputen ◽  
Marián Palcut
Keyword(s):  
Chemical Composition ◽  
Transition Metal ◽  
Noble Metals ◽  
Point Group ◽  
Electrochemical Activity ◽  
Physical Contact ◽  
Localized Corrosion ◽  
Group Symmetry ◽  
Aqueous Corrosion ◽  
Corrosion Properties

Complex metallic alloys (CMAs) are materials composed of structurally complex intermetallic phases (SCIPs). The SCIPs consist of large unit cells containing hundreds or even thousands of atoms. Well-defined atomic clusters are found in their structure, typically of icosahedral point group symmetry. In SCIPs, a long-range order is observed. Aluminum-based CMAs contain approximately 70 at.% Al. In this paper, the corrosion behavior of bulk Al-based CMAs is reviewed. The Al–TM alloys (TM = transition metal) have been sorted according to their chemical composition. The alloys tend to passivate because of high Al concentration. The Al–Cr alloys, for example, can form protective passive layers of considerable thickness in different electrolytes. In halide-containing solutions, however, the alloys are prone to pitting corrosion. The electrochemical activity of aluminum-transition metal SCIPs is primarily determined by electrode potential of the alloying element(s). Galvanic microcells form between different SCIPs which may further accelerate the localized corrosion attack. The electrochemical nobility of individual SCIPs increases with increasing concentration of noble elements. The SCIPs with electrochemically active elements tend to dissolve in contact with nobler particles. The SCIPs with noble metals are prone to selective de-alloying (de–aluminification) and their electrochemical activity may change over time as a result of de-alloying. The metal composition of the SCIPs has a primary influence on their corrosion properties. The structural complexity is secondary and becomes important when phases with similar chemical composition, but different crystal structure, come into close physical contact.

TEM Characterization of Corrosion Initiation in Passive Films

2001 ◽  
Vol 7 (S2) ◽  
pp. 1278-1279
Author(s):  
D. Elswick ◽  
J. Hren ◽  
P. Kotula ◽  
N. Missert ◽  
F. Wall
Keyword(s):  
Electric Fields ◽  
Alcohol Solution ◽  
Passive Films ◽  
Localized Corrosion ◽  
Fine Needle ◽  
Corrosion Initiation ◽  
Pit Initiation ◽  
Insight Into ◽  
Lateral Area

This research program is intended to develop new insight into the mechanisms of localized corrosion initiation in passive metals through unique approaches based on examining corrosion initiation on needle-shaped samples similar to field emitter tips. Samples with this geometry allow localization of corrosion initiation to the tip itself and therefore pit initiation can be confined to a small lateral area. Local electric fields can also be controlled, thus permitting damage to be confined in the passive over layer, and characterized before pit initiation.High purity Al wire was used for the initial studies. Wire shaped specimens were electropolished in a 20 % perchloric in methyl alcohol solution at -30°C to obtain the fine needle geometry. The resultant tip radii ranged from 40 to 150 nm with no further sample prep needed and without the presence of artifacts.A custom-designed TEM holder for a Philips CM30 was fabricated, which allowed the needles to be characterized by TEM both prior to and after experiments.

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