New High-Resolution Solution for Measuring Degree of Sensitization of Duplex Stainless Steel 2205 Using Double-Loop Electrochemical Potentiodynamic Reactivation Technique

CORROSION ◽  
10.5006/0699 ◽  
2013 ◽  
Vol 69 (3) ◽  
pp. 230-242 ◽  
Author(s):  
B. Hashemi ◽  
A. Davoodi ◽  
M. Momeni ◽  
M.H. Moayed
Keyword(s):  
Stainless Steel ◽  
High Resolution ◽  
Duplex Stainless Steel ◽  
Double Loop ◽  
Degree Of Sensitization

scholarly journals Determination of Susceptibility to Intergranular Corrosion of UNS 31803 Type Duplex Stainless Steel by Electrochemical Reactivation Method: A Comparative Study

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Mehmet Emin Arıkan ◽  
Rafet Arıkan ◽  
Mustafa Doruk
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Intergranular Corrosion ◽  
Intermetallic Phases ◽  
Double Loop ◽  
Degree Of Sensitization ◽  
Hot Rolled ◽  
Standard Weight

In the present study as in our previous studies (Arikan and Doruk, 2008 and Arikan et al., 2012), similar specimens taken from a hot rolled cylindrical duplex stainless steel (DSS) bar with 22% Cr grade were solution annealed at 1050°C and then aged at 800∘C from 100 to 31622 min for sensitization treatment. Double loop electrochemical potentiodynamic reactivation and standard weight loss immersion acid tests were conducted. The solution annealed samples were found unsensitized. The samples aged for 100 min were less sensitized whereas samples aged for 316 min and more time were sensitized. The degree of sensitization (DOS) can be attributed to higher contribution of chromium and molybdenum depleted areas that result from intermetallic phases. However, especially the samples aged from 3162 to 31622 min have revealed chromium replenishment. Consequently, the degree of sensitization was lowered in comparison to the results obtained in previous studies.

scholarly journals Determination of Susceptibility to Intergranular Corrosion of UNS 31803 Type Duplex Stainless Steel by Electrochemical Reactivation Method

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Mehmet Emin Arıkan ◽  
Rafet Arıkan ◽  
Mustafa Doruk
Keyword(s):  
Weight Loss ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Intergranular Corrosion ◽  
Intermetallic Phases ◽  
Double Loop ◽  
Degree Of Sensitization ◽  
Hot Rolled ◽  
Standard Weight

Specimens taken from a hot-rolled cylindrical duplex stainless steel (DSS) bar with 22% Cr grade were solution annealed at1050∘C and then aged at725∘C from 100 to 31622 min for sensitization treatment. Double loop electrochemical potentiodynamic reactivation and standard weight loss immersion acid tests were conducted. The solution-annealed samples were found unsensitized. Those samples aged for 100 and 316 min were less sensitized whereas samples aged for 1000 min and especially those aged for 3162, 10000, and 31622 min were heavily sensitized. The degree of sensitization (DOS) can be attributed to higher contribution of chromium- and molybdenum-depleted areas resulting from intermetallic phases.

scholarly journals Application of electrochemical methods for the investigation of intergranular corrosion welded joint austenitic stainless steel 19Cr-9Ni

2011 ◽  
Vol 65 (2) ◽  
pp. 179-186 ◽  
Author(s):  
Bore Jegdic ◽  
Ana Alil ◽  
Zlatan Milutinovic ◽  
Zoran Odanovic ◽  
Bojan Gligorijevic ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Welded Joints ◽  
Intergranular Corrosion ◽  
Significant Degree ◽  
Electrochemical Methods ◽  
Double Loop ◽  
Quantitative Evidence ◽  
Degree Of Sensitization ◽  
Electrochemical Potentiokinetic Reactivation

Sensitization degree of the austenitic stainless steel welded joints was investigated by electrochemical methods of the double loop electrochemical potentiokinetic reactivation (DL EPR) in H2SO4 + KSCN solution, and by the measurement of corrosion potential of the steel in the drop of the solution of HNO3 + FeCl3 + HCl. The welded joints were tested by X-ray radiographic method in order to check the presence of the weld defects. Grain size of the base metal and the welded joints were determined by optical microscopy. Good agreement between the results obtained by different electrochemical methods was obtained. Heat-affected zone (HAZ) of the austenitic stainless steel welded joints has shown significant degree of sensitization. The double loop electrochemical potentiokinetic method gave quantitative evidence about susceptibility of the stainless steel to intergranular corrosion.

scholarly journals Corrosion Assessment of ASME Qualified Welding Procedures for Grade 2101 Lean Duplex Stainless Steel

CORROSION ◽  
10.5006/3257 ◽  
2019 ◽  
Vol 75 (10) ◽  
pp. 1216-1229 ◽  
Author(s):  
L.H. Guilherme ◽  
P. Reccagni ◽  
A.V. Benedetti ◽  
C.S. Fugivara ◽  
D.L. Engelberg
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Potentiodynamic Polarization ◽  
Electrochemical Corrosion ◽  
Localized Corrosion ◽  
Corrosion Performance ◽  
Kelvin Probe ◽  
Lean Duplex Stainless Steel ◽  
Degree Of Sensitization ◽  
Weld Parameters

ASME qualified welding procedures do not guarantee suitable corrosion and passivation properties for lean duplex stainless steel welds. An evaluation of two ASME qualified welding procedures to optimize the corrosion performance of tungsten inert gas (TIG) welded grade 2101 duplex stainless steel using ER2209 weld consumable was conducted. The evolution of the microstructure was examined by optical and electron microscopy, ferrite-scope measurements, and scanning Kelvin probe force microscopy. An electrochemical mini-cell was then used to characterize the electrochemical behavior of different weld regions using the techniques such as the double loop electrochemical potentiokinetic reactivation test, standard potentiodynamic polarization tests, and cyclic potentiodynamic polarization. The fusion line was the most critical zone for localized corrosion for both welding procedures, due to the formation of Cr- and Mo-depleted zones, resulting in the highest degree of sensitization. The best performance was attributed to the weld face, due to the presence of higher Cr and Mo contents, highlighting the pitting corrosion resistance. A heat input range of 1.6 kJ/mm to 1.9 kJ/mm and low current density (WPS 1) indicated better corrosion performance of all weld regions. The electrochemical corrosion response was in all cases related to microstructural characteristics of the weld regions. The influence of weld parameters on microstructure development and corrosion performance is discussed.

Practical aspects on the use of on-site Double Loop Electrochemical Potentiodynamic Reactivation Technique (DL-EPR) for Duplex Stainless Steel

2013 ◽  
Vol 74 ◽  
pp. 250-255 ◽  
Author(s):  
Kioshy S. de Assis ◽  
A.C. Rocha ◽  
Isabel C.P. Margarit-Mattos ◽  
F.A.S. Serra ◽  
Oscar R. Mattos
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Double Loop
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