scholarly journals Corrosion Behavior and Susceptibility to Stress Corrosion Cracking of Leaded and Lead-Free Brasses in Simulated Drinking Water

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 144
Author(s):  
Jamal Choucri ◽  
Andrea Balbo ◽  
Federica Zanotto ◽  
Vincenzo Grassi ◽  
Mohamed Ebn Touhami ◽  
...  
Keyword(s):  
Drinking Water ◽  
Stress Corrosion ◽  
Corrosion Behavior ◽  
Stress Corrosion Cracking ◽  
Distribution Systems ◽  
Electrochemical Impedance ◽  
Chloride Concentration ◽  
Corrosion Cracking ◽  
Lead Free ◽  
Diffusion Control

Duplex α + β’ brasses are widely used in drinking water distribution systems for tube fittings, valves, and ancillaries because they are low cost, easy to fabricate, and exhibit high mechanical strength. However, depending on application conditions and alloy composition, they may undergo dealloying and stress corrosion cracking. In this research, three different brass types, two leaded (CW617N and CW602N) alloys and one lead-free brass (CW724R), were investigated to assess their corrosion behavior and susceptibility to stress corrosion cracking (SCC) in simulated drinking water (SDW) solutions containing different chloride concentrations, compatible with drinking water composition requirements according to Moroccan standard NM 03.7.001. The corrosion behavior was assessed by electrochemical tests such as polarization curve recording and electrochemical impedance spectroscopy (EIS) monitoring, coupled to SEM-EDS surface observations. The susceptibility to SCC was investigated by slow strain rate tests (SSRT). The tests showed that corrosion was mainly under diffusion control and chlorides slightly accelerated corrosion rates. All alloys, and particularly CW617N, were affected by SCC under the testing conditions adopted and in general the SCC susceptibility increased at increasing chloride concentration.

scholarly journals Effect of CO2/H2S and Applied Stress on Corrosion Behavior of 15Cr Tubing in Oil Field Environment

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 409
Author(s):  
Xuehui Zhao ◽  
Wei Huang ◽  
Guoping Li ◽  
Yaorong Feng ◽  
Jianxun Zhang
Keyword(s):  
Stainless Steel ◽  
Partial Pressure ◽  
Stress Corrosion ◽  
Applied Stress ◽  
Corrosion Behavior ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Oil Field ◽  
Uniform Corrosion ◽  
Field Environment

The corrosion behavior of a 15Cr-6Ni-2Mo martensitic stainless steel (15Cr stainless steel) in a CO2/H2S environment was investigated by conducting high-temperature/high-pressure immersion tests combined with scanning electron microscopy and metallographic microscopy. The presence of H2S decreased the corrosion resistance of the 15Cr tubing steel. The critical H2S partial pressure (PH2S) for stress corrosion cracking in the 15Cr tubing steel in the simulated oil field environment with a CO2 partial pressure of 4 MPa and an applied stress of 80% σs was identified. The 15Cr tubing steel mainly suffered uniform corrosion with no pitting and cracking when the PH2S was below 0.5 MPa. When the PH2S increased to 1 MPa and the test temperature was 150 °C, the pitting and cracking sensitivity increased. The stress corrosion cracking at a higher PH2S is attributed to the sulfide-induced brittle fracture.

The Inhibition Effect of Imidazoline and Diethylene Triamine on the Stress Corrosion Cracking of 08Cr2AlMo Steel in H2S Solution

2007 ◽  
Vol 353-358 ◽  
pp. 2467-2470
Author(s):  
Yao Feng Zhang ◽  
Bo Qin Gu
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Steel Surface ◽  
Electrochemical Impedance ◽  
Water Solution ◽  
Corrosion Cracking ◽  
Inhibition Effect ◽  
Diethylene Triamine ◽  
Scanning Electron ◽  
Better Than

08Cr2AlMo steel is a type of material developed especially for heat exchanger pipe bundle used under H2S condition in the recent years. In this paper, some researches were carried out on the stress corrosion cracking (SCC) susceptivity of 08Cr2AlMo steel in H2S water solution and the inhibition of imidazoline and diethylene triamine on the SCC by means of slow strain rate tensile test, scanning electron microscopy, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results indicate that 08Cr2AlMo steel is highly susceptible to SCC in saturated H2S solution for the fracture surfaces of specimen show typical quasi-cleavage fracture. The addition of both imidazoline and diethylene triamine into saturated H2S solution is effective on inhibiting the SCC. The inhibitors can reduce the potential of the cathodic hydrogen evolution, which prevents the penetration of hydrogen into the specimen effectively. Furthermore, inhibitors accelerate the formation of the chemically bonded film on the steel surface. It is also found that when the concentration of inhibitors is below 0.2%, there is no obvious inhibition effect on SCC, and the inhibition effect of diethylene triamine is better than that of imidazoline.

The Corrosion Behavior of Welded Line Pipes in Wet H2S Environment

2002 ◽  
Author(s):  
Yaorong Feng ◽  
Chunyong Huo ◽  
Feng Yan
Keyword(s):  
Residual Stress ◽  
Corrosion Resistance ◽  
Stress Corrosion ◽  
Applied Stress ◽  
Corrosion Behavior ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Steel Pipes ◽  
H2s Corrosion ◽  
Hydrogen Induced Cracking

The corrosion behavior of over-bending and under-bending formed Spiral Submerged Arc Welded (SSAW) steel pipes in NACE solution has been investigated by use of the self-designed full-scale corrosion test unit. It indicates that the H2S damage of welded pipes characteristics Blister and Stress Corrosion Cracking (SCC). The blister number, diameter, and crack number is increasing as the increasing of applied stress. The residual stress of welded pipes has a large effect on the H2S corrosion resistance, the tensile residual stress has a detrimental effect, and while the compression residual stress is beneficial to H2S corrosion resistance. The damage mechanism of the welded pipes in H2S containing solution under the presence of applied stress and residual stress has not only Hydrogen Induced Cracking (HIC), but also Stress Corrosion Cracking, and the applied stress and residual stress promote not only Stress Corrosion Cracking, but also Hydrogen Induced Cracking. The test results reveal that improving pipe’s weld surface quality, lowering tensile residual stress, and also control the operating stress are the key measures for controlling the wet H2S corrosion of welded steel pipes. Suggestions for selection of line pipes in different service conditions have been made.

Mechanism of Stress Corrosion Of Austenitic Stainless Steels In Chloride Waters★

CORROSION ◽  
1959 ◽  
Vol 15 (7) ◽  
pp. 51-59 ◽  
Author(s):  
R. W. STAEHLE ◽  
F. H. BECK ◽  
M. G. FONTANA
Keyword(s):  
Stress Corrosion ◽  
Dimensional Analysis ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Three Dimensional ◽  
Chloride Concentration ◽  
Austenitic Stainless Steels ◽  
Corrosion Cracking ◽  
Wetting And Drying ◽  
Oxygen Stress

Abstract Stress-corrosion cracking of austenitic stainless steels was studied under various conditions of stress, chloride concentration, complete immersion of specimens, intermittent wetting and drying, and presence of oxygen. Stress-corrosion cracking will occur at stresses as low as 2,000 psi at 50 ppm NaCl. A three-dimensional analysis of stress-corrosion cracks was made and a mechanism of cracking proposed. 3.2.2

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