Corrosion Behavior of Duplex Stainless Steels (2205) in Seawater in the Presence of Deep Sea Bacteria

2014 ◽  
Vol 513-517 ◽  
pp. 189-192 ◽  
Author(s):  
John Gerald Odhiambo ◽  
Li Zhang ◽  
Tao Liu ◽  
Li Hua Dong ◽  
Yan Sheng Yin
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Corrosion Behavior ◽  
Deep Sea ◽  
Electrochemical Impedance ◽  
Chloride Ions ◽  
Localized Corrosion ◽  
Electrochemical Impedance Spectra ◽  
Deep Sea Bacteria ◽  
Simulated Seawater

The corrosion behavior of duplex stainless steel immersed in nutrient-rich simulated seawater without deep sea bacteria and with deep sea bacteria (Erythrobacter pelagi sp.nov) was studied. The effect of chloride ions and presence of deep sea bacteria on corrosion resistance was investigated. The occurrence of localized corrosion (Viz. pitting and crevice corrosion) was examined using visual inspection and SEM-EDX. Electrochemical impedance spectra were used to study the effects of deep sea bacteria on duplex stainless steel and inferences were made. Most significantly was the reduction of pitting resistance potential with increase in exposure time.

The Corrosion Behavior of Cu-Ni-Si Alloy in Sea Water with Deep-Sea Bacteria

2014 ◽  
Vol 936 ◽  
pp. 1102-1105 ◽  
Author(s):  
Yuan Yuan Shen ◽  
Li Zhang ◽  
Li Hua Dong ◽  
Tao Liu ◽  
Qian Lei ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Deep Sea ◽  
Sea Water ◽  
Electrochemical Impedance ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Microstructure Observation ◽  
Deep Sea Bacteria ◽  
Nutrient Rich Medium ◽  
Simulated Seawater

The corrosion behavior of Cu-Ni-Si alloy exposed to a nutrient-rich simulated seawater-based nutrient-rich medium in the presence of a deep-sea bacterial (Erythrobacter pelagi sp.nov) was investigated by metallographic microstructure observation, electrochemical impedance spectroscopy (EIS) measurement. It was demonstrated that the charge transfer resistance (Rct) and the resistance of oxide film (Rf) dramatically increased within 2 days then gradually decrease and becoming stable because of an patchy or blotchy biofilm formed on the surface of the alloy.

Corrosion behavior of a new 25Cr-3Ni-7Mn-0.66 N duplex stainless steel in artificial seawater

2021 ◽  
Vol 63 (6) ◽  
pp. 505-511
Author(s):  
Songkran Vongsilathai ◽  
Anchaleeporn Waritswat Lothongkum ◽  
Gobboon Lothongkum
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Passive Film ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Melting Furnace ◽  
Artificial Seawater ◽  
Vacuum Arc ◽  
Significant Difference ◽  
Type Semiconductor

Abstract A new duplex 25Cr-3Ni-7Mn-0.66 N alloy was prepared in a vacuum arc re-melting furnace and characterized by metallographic and EPMA methods. Its corrosion behavior was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and a Mott-Schottky (M-S) analysis in artificial seawater at room temperature and compared with those of super and normal commercial duplex stainless steel (SDSS and DSS). No significant difference in the open circuit potentials and pitting potentials was observed. Its passive film current density lies between those of SDSS and DSS. This was confirmed by EIS analysis. A pit attack was observed on the δ-phase for all duplex samples, because the PREN16 of the δ-phase was lower than that of the γ-phase. From the Mott-Schottky analysis, the passive films were found to be composed of bi-layer structures, a p-type semiconductor inner layer, and a n-type semiconductor outer layer. The degree of defect as well as the effect of nitrogen in passive film layer are discussed with respect to the point defect model.

scholarly journals Investigation on the Corrosion Behavior of Lean Duplex Stainless Steel 2404 after Aging within the 650–850 °C Temperature Range

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 529 ◽  
Author(s):  
Federica Zanotto ◽  
Vincenzo Grassi ◽  
Andrea Balbo ◽  
Fabrizio Zucchi ◽  
Cecilia Monticelli
Keyword(s):  
Stainless Steel ◽  
Grain Boundaries ◽  
Duplex Stainless Steel ◽  
Corrosion Behavior ◽  
Thermal Aging ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Localized Corrosion ◽  
Fast Diffusion ◽  
Lean Duplex Stainless Steel

This paper reports the effects of thermal aging between 650 and 850 °C on the localized corrosion behavior of lean duplex stainless steel (LDSS 2404). Critical pitting temperature (CPT) and double loop electrochemical potentiokinetic reactivation (DL-EPR) tests were performed. The localization of pitting attack and intergranular corrosion (IGC) attack after DL-EPR was investigated by optical (OM) and scanning electron microscopy (SEM) and by focused ion beam (FIB) coupled to SEM. Thermal aging caused the precipitation of mainly chromium nitrides at grain boundaries. Aging at 650 °C or short aging times (5 min) at 750 °C caused nitride precipitation mainly at α/α grain boundaries as a result of fast diffusion of chromium in this phase. Aging at 850 °C or aging times from 10 to 60 min at 750 °C also allowed the precipitation at the α/γ interface. Nitrides at γ/γ grain boundaries were observed rarely and only after long aging times (60 min) at 850 °C. Electrochemical tests showed that in as-received samples, pitting attack only affected the α phase. Conversely, in aged samples, pitting and IGC attack were detected close to nitrides in correspondence of α/α and α/γ grain boundaries depending on aging temperatures and times.

Electrochemical Study of Diffusion Bonded Joints between Micro-Duplex Stainless Steel and Ti6Al4V Alloy

2014 ◽  
Vol 783-786 ◽  
pp. 2250-2259
Author(s):  
S.M. Bhola ◽  
S. Kundu ◽  
Brajendra Mishra ◽  
Subrata Chatterjee
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Ti6al4v Alloy ◽  
Uniaxial Pressure ◽  
Equilibrium Potential ◽  
Scattered Electron ◽  
Corrosion Rates ◽  
Bonded Interface

In the present study, corrosion behavior of a diffusion bonded interface formed between micro-duplex stainless steel (MDSS) and a mixed titanium alloy (Ti6Al4V) formed at 900°C for 60 minutes under 4MPa uniaxial pressure in vacuum has been investigated in 1M HCl and 1 M NaOH solutions using various electrochemical measurements such as Equilibrium Potential (EP), Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic Polarization (PD). For comparison, corrosion behavior of base metal alloys, MDSS and Ti6Al4V have also been also characterized. Bonded interface has been characterized in light optical microscopy and scanning electron microscopy using back scattered electron. The layer wise σ phase and λ+FeTi phase mixture has been observed at the bond interface and the bond tensile strength and shear strength were ~556.4MPa and ~420.2MPa, respectively. The corrosion rates of the bonded joint are intermediate to the corrosion rates of MDSS and Ti6Al4V alloy.

A STEM Examination of the Localized Corrosion Behavior of a Duplex Stainless Steel

CORROSION ◽  
1980 ◽  
Vol 36 (5) ◽  
pp. 246-251 ◽  
Author(s):  
P. E. MANNING ◽  
C. E. LYMAN ◽  
D. J. DUQUETTE
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Corrosion Behavior ◽  
Localized Corrosion

The Localized Corrosion Behavior Associated with Microstructure of F53 Super Duplex Stainless Steel

2015 ◽  
Vol 53 (7) ◽  
pp. 464-473 ◽  
Author(s):  
Soon-Tae Kim ◽  
In-Sung Lee ◽  
Kyeong-Ho Kong ◽  
Yong-Soo Park ◽  
Jong-Hoon Lee ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Corrosion Behavior ◽  
Localized Corrosion ◽  
Super Duplex Stainless Steel

Effect of Mn Addition on Mechanical Property and Corrosion Behavior in Hot Rolled 19 % Cr Duplex Stainless Steel

2014 ◽  
Vol 1004-1005 ◽  
pp. 231-234
Author(s):  
Yin Hui Yang ◽  
Yang Gu
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Corrosion Behavior ◽  
Polarization Resistance ◽  
Electrochemical Impedance ◽  
Corrosion Prevention ◽  
Mn Content ◽  
Hot Rolled

The effect of Mn addition on mechanical property and corrosion behavior of hot rolled 19 % Cr duplex stainless steel was investigated. The ultimate tensile strength of specimen decreased from 950 to 840 MPa with increasing Mn content from 3.6 to 5.5 wt.%, and further decreased to 768MPa with Mn content addition up to 8.1 wt.%. The sample with the addition of 5.5 wt.% Mn exhibited the highest elongation up to 43%. The polarization result revealed that higher value of breakdown potentials Eb was obtained with increasing Mn content from 3.6 to 5.5 wt. %, but which decreased with increasing Mn content to 8.1 wt.%. The electrochemical impedance spectroscopy (EIS) spectra showed higher corrosion prevention capability was obtained due to enhancement of polarization resistance with increasing Mn content from 3.6 to 5.5 wt.%.

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