Determination of Intergranular Corrosion Susceptibility of Z3CN20.09M Cast Duplex Stainless Steel by a Modified Double Loop Electrochemical Potentiokinetic Reactivation Method

2014 ◽  
pp. 557-562
Author(s):  
Y. Z. Shi ◽  
B. Yang ◽  
M. X. Zhang ◽  
H. C. Wu ◽  
S. L. Wang
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Intergranular Corrosion ◽  
Double Loop ◽  
Electrochemical Potentiokinetic Reactivation ◽  
Corrosion Susceptibility

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.

Evaluation of the Susceptibility to Intergranular Corrosion for a Novel Cr-Mn-N Austenitic Stainless Steel Using DL-EPR

2013 ◽  
Vol 631-632 ◽  
pp. 192-197
Author(s):  
Lei Gang Zheng ◽  
Xiao Qiang Hu ◽  
Xiu Hong Kang ◽  
Dian Zhong Li
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Electrolyte Solution ◽  
Intergranular Corrosion ◽  
Xrd Analysis ◽  
Double Loop ◽  
Chromium Depletion ◽  
Electrochemical Potentiokinetic Reactivation ◽  
Epr Test ◽  
Optical Micrographs

The sensitization and intergranular corrosion (IGC) behavior of a novel Cr-Mn-N austenitic stainless steel (named as MPMD133) sensitized in the temperature range from 600 oC to 1000oC for 3 hours was investigated by the double loop electrochemical potentiokinetic reactivation (DL-EPR) test. The effects of the sensitization temperature on the susceptibility to IGC of MPMD133 were examined in the 0.5M H2SO4 +0.01M KSCN electrolyte solution. The results show that the degree of IGC increases as the sensitization temperature increasing till 900oC. Meanwhile it decreases rapidly when the sensitization temperature is elevated up to 1000oC, which is confirmed by the subsequent optical micrographs observation. The XRD analysis reveals that the precipitation of Cr23C6 leads to chromium depletion along the grain boundaries, consequently results in the susceptibility to IGC.

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