Electrochemical method of testing stainless steels for intercrystalline corrosion

1979 ◽  
Vol 21 (3) ◽  
pp. 233-233
Keyword(s):  
Stainless Steels ◽  
Electrochemical Method ◽  
Intercrystalline Corrosion

Detecting Critical Crevice Temperature for Duplex Stainless Steels in Chloride Solutions

CORROSION ◽  
2011 ◽  
Vol 67 (2) ◽  
pp. 025004-1-025004-7 ◽  
Author(s):  
D. Han ◽  
Y. Jiang ◽  
B. Deng ◽  
L. Zhang ◽  
J. Gao ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Crevice Corrosion ◽  
Electrochemical Method ◽  
Duplex Stainless Steels ◽  
Good Reproducibility ◽  
X Ray ◽  
Initiation Step ◽  
Critical Pitting Temperature ◽  
Preferential Dissolution ◽  
Scanning Electron

Abstract A simple and rapid electrochemical method for the evaluation of crevice corrosion in duplex stainless steels (DSS) is described. Three types of DSS—namely, UNS S32101, UNS S31803, and UNS S32750—were tested in 1 mol/L sodium chloride (NaCl) solutions. Results showed good reproducibility with a typical standard deviation of below 3°C. The critical pitting temperature (CPT) for the same specimens was also investigated in 1 mol/L NaCl solutions. An approximately 20°C decrease from CPT to critical crevice temperature (CCT) was observed and subsequently explained. Then, the morphologies of crevice corrosion were studied using scanning electron microscopy with energy-dispersive x-ray spectroscopy (SEM/EDS) method. The SEM/EDS study revealed that the ferrite phase was the site where preferential dissolution took place at the initiation step of crevice corrosion, which was in accordance with the prediction by calculating the critical crevice index. Moreover, repassivation was detected with the development of crevice corrosion. The reason was clarified by combining the results obtained with a successful diffusion model, and eventually the crevice corrosion progress was illustrated schematically.

The Critical Pitting Chloride Concentration of Various Stainless Steels Measured by an Electrochemical Method

2018 ◽  
Vol 165 (14) ◽  
pp. C939-C949 ◽  
Author(s):  
Xuan Wu ◽  
Yangting Sun ◽  
Yuanyuan Liu ◽  
Yuanyuan Yang ◽  
Jin Li ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Electrochemical Method ◽  
Chloride Concentration

The causes of intercrystalline corrosion in stainless steels

1972 ◽  
Vol 14 (7) ◽  
pp. 590-595
Author(s):  
A. P. Gulyaev ◽  
N. V. Andrushova ◽  
Yu. V. Zakharov
Keyword(s):  
Stainless Steels ◽  
Intercrystalline Corrosion
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