Initiation of stress corrosion cracking in cold-drawn prestressing steel in hardened cement mortar exposed to chlorides

CORROSION ◽  
10.5006/3730 ◽  
2021 ◽  
Author(s):  
Dyana Joseline ◽  
Radhakrishna Pillai ◽  
Lakshman Neelakantan
Keyword(s):  
Stress Corrosion ◽  
Passive Film ◽  
Stress Corrosion Cracking ◽  
Cement Mortar ◽  
High Strength ◽  
Corrosion Cracking ◽  
Hardened Cement ◽  
Electrochemical Characteristics ◽  
Residual Tensile Stress ◽  
Prestressing Steel

Cold-drawn, high strength, prestressing (PS) steel strands are widely used in pretensioned concrete (PTC) structures. This paper discusses the stress corrosion cracking (SCC) of PS steel embedded in cement mortar and gradually exposed to chlorides. Various stages of the passive to active (P-to-A) transition, which marks the onset of SCC, were investigated using EIS technique. The key mechanisms were identified and confirmed using SEM/EDAX, XRD and Confocal Raman Spectroscopy. It was found that the passive film on unstressed PS steel has better electrochemical characteristics than that on conventional steel rebars. However, the residual tensile stress at the surface of PS steels can assist passive film cracking after chloride attack - contrary to the pitting corrosion without cracking of passive film in conventional steels. Further, tests indicated that the concentration of chlorides required to crack the passive film in PS steels can reduce by about 50% when prestressed – as in field structures. Chemical composition, stress state and microstructural features at the PS steel surface were identified as possible factors influencing the initiation of SCC in PTC structures.

Susceptibility to stress corrosion cracking of a prestressing steel in NaHCO3 solutions

1993 ◽  
Vol 34 (6) ◽  
pp. 961-973 ◽  
Author(s):  
M.C. Alonso ◽  
R.P.M. Procter ◽  
C. Andrade ◽  
M. Sáenz de Santa María
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Prestressing Steel

Investigating the Stress Corrosion Cracking (SCC) Susceptibility of Ti-6Al-4V Alloys Fabricated by Electron Beam Melting in Deep-Sea Environment

CORROSION ◽  
10.5006/3822 ◽  
2021 ◽  
Author(s):  
yang Zhao ◽  
Yuchen Liu ◽  
Xin Gai ◽  
Yun Bai ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Electron Beam ◽  
Strain Rate ◽  
Stress Corrosion ◽  
Surface Analysis ◽  
Passive Film ◽  
Stress Corrosion Cracking ◽  
Deep Sea ◽  
Electron Beam Melting ◽  
Corrosion Cracking ◽  
Passivating Film

The stress corrosion cracking (SCC) susceptibility of electron beam melted Ti-6Al-4V alloy (ET) was compared with the conventional wrought alloy (WT). The electrochemical and slow strain rate tensile (SSRT) tests, as well as surface analysis, were conducted under simulated shallow and deep-sea environment. Under shallow conditions, the SCC susceptibility of both alloys was almost the same because of consistent passivation and re-passivation performance of the passivating film. However, under deep-sea conditions, SCC susceptibility of ET was higher than that of WT due to stronger textured-like surface that appeared on ET alloy, where early developed passive film broke down, demonstrating lower passivation and re-passivation rate.

Stress Corrosion Cracking of SA-543 High-Strength Steel in All-Volatile Treatment Boiler Feed Water

2015 ◽  
Vol 24 (10) ◽  
pp. 3773-3782
Author(s):  
R. Rihan ◽  
M. Basha ◽  
A. Al-Meshari ◽  
A. Bayramov ◽  
G. van Zyl ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strength Steel ◽  
High Strength ◽  
Corrosion Cracking ◽  
Feed Water ◽  
Boiler Feed Water
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