The mechanism of stress corrosion of steel Kh18N10T in water containing chlorine ions

1969 ◽  
Vol 4 (1) ◽  
pp. 68-70
Author(s):  
A. N. Kuzyukov ◽  
V. A. Borisenko ◽  
E. K. Malakhova
Keyword(s):  
Stress Corrosion ◽  
Steel Kh18n10t ◽  
Chlorine Ions ◽  
Corrosion Of Steel

Stabilizing annealing as a means of preventing corrosion of steel Kh18N10T in nitric acid

1973 ◽  
Vol 9 (12) ◽  
pp. 1100-1102
Author(s):  
L. P. Lozovatskaya ◽  
I. K. Burtseva ◽  
I. A. Levin
Keyword(s):  
Nitric Acid ◽  
Steel Kh18n10t ◽  
Corrosion Of Steel

scholarly journals Cleavage-dissolution assisted stress corrosion cracking under elastic loads

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Longkui Zhu ◽  
Yao Li
Keyword(s):  
Surface Energy ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Three Dimensional ◽  
Corrosion Cracking ◽  
Dissolution Mechanism ◽  
Corrosive Environment ◽  
Hydrogen Atoms ◽  
Brittle Rupture ◽  
Chlorine Ions

AbstractAs a significant cause of disastrous accidents, stress corrosion cracking (SCC) under elastic loads was investigated in type 316 L single-crystal stainless steel immersed in a boiling 45 wt% MgCl2 solution. Three-dimensional microcrack morphologies, characterized using synchrotron-based X-ray computed tomography, indicate that the SCC advanced along the cleavage planes (1 0 0) with the lowest free surface energy. The first-principles simulations show that synergistic adsorption of H and Cl atoms in the octahedral interstices minimized the surface energy of the cleavage planes (0 0 1) owing to a 73% reduction. Afterwards, the cleavage-dissolution mechanism is put forward, proposing that the SCC essentially originates from preferential brittle rupture of the corrosive environment particle adsorbed low-surface-energy cleavage planes in the elastic stress concentration zones, and anodic dissolution along the crack fronts. Besides, the corrosive environment particles primarily consist of the hydrogen atoms and the electronegative ions such as the chlorine ions.

Surface Films on Zircaloy-2 Samples Cracked in Neutral Aqueous NaCl by Stress Corrosion

1973 ◽  
Vol 31 ◽  
pp. 46-47
Author(s):  
R.A. Ploc
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Film Thickness ◽  
Stress Corrosion ◽  
Zirconium Dioxide ◽  
Surface Film ◽  
Surface Films ◽  
Continuous Layer ◽  
Transmission Electron ◽  
Product Film

Samples of low-nickel Zircaloy-2 (material MLI-788-see(1)), when anodically polarized in neutral 5 wt% NaCl solutions, were found to be susceptible to pitting and stress corrosion cracking. The SEM revealed that pitting of stressed samples was occurring below a 2000Å thick surface film which behaved differently from normal zirconium dioxide in that it did not display interference colours. Since the initial film thickness was approximately 65Å, attempts were made to examine the product film by transmission electron microscopy to deduce composition and how the corrosion environment could penetrate the continuous layer.

Structure of stacking faults in pyrite using TEM techniques

1992 ◽  
Vol 50 (1) ◽  
pp. 358-359
Author(s):  
Raja Subramanian ◽  
Kenneth S. Vecchio
Keyword(s):  
Lattice Structure ◽  
Stacking Faults ◽  
Covalent Bond ◽  
Group Symmetry ◽  
Iron Pyrite ◽  
Dislocation Glide ◽  
Partial Dislocations ◽  
Transmission Electron ◽  
Contrast Analysis ◽  
Chlorine Ions

The structure of stacking faults and partial dislocations in iron pyrite (FeS2) have been studied using transmission electron microscopy. Pyrite has the NaCl structure in which the sodium ions are replaced by iron and chlorine ions by covalently-bonded pairs of sulfur ions. These sulfur pairs are oriented along the <111> direction. This covalent bond between sulfur atoms is the strongest bond in pyrite with Pa3 space group symmetry. These sulfur pairs are believed to move as a whole during dislocation glide. The lattice structure across these stacking faults is of interest as the presence of these stacking faults has been preliminarily linked to a higher sulfur reactivity in pyrite. Conventional TEM contrast analysis and high resolution lattice imaging of the faulted area in the TEM specimen has been carried out.

Sign in / Sign up

Export Citation Format

Share Document