Determination of the Critical Pitting Temperature of Martensitic and Supermartensitic Stainless Steels in Simulated Sour Environments Using Electrochemical Noise Analysis

CORROSION ◽  
2010 ◽  
Vol 66 (4) ◽  
pp. 045003-045003-8 ◽  
Author(s):  
M. Iannuzzi ◽  
C. Mendez ◽  
L. Avila-Gray ◽  
G. Maio ◽  
H. Rincón
Keyword(s):  
Stainless Steels ◽  
Electrochemical Noise ◽  
Noise Analysis ◽  
Critical Pitting Temperature

scholarly journals Electrochemical noise analysis to obtain the Rsn value via FFT using Excel

2020 ◽  
Vol 45 (4) ◽  
pp. 57-70
Author(s):  
Sidineia Barrozo ◽  
Riberto Nunes Peres ◽  
Marcus José Witzler ◽  
Assis Vicente Benedetti ◽  
Cecílio Sadao Fugivara
Keyword(s):  
Electrochemical Noise ◽  
Rapid Determination ◽  
Noise Analysis ◽  
External Signal ◽  
Noise Resistance ◽  
Microsoft Excel ◽  
Step Procedure ◽  
Noise Data ◽  
Excellent Tool

Electrochemical noise (EN) measurements are based on the fluctuations of the electrochemical potential and the current that occur during, for example, a corrosion process without an external signal perturbation. EN analysis (ENA) allows assessment of the type of corrosion and rapid determination of the corrosion rate. Microsoft Excel®, an inexpensive and readily available software package, is an excellent tool for performing repetitive calculations, with automation that saves time for the users. It is a useful tool for the analysis of EN data using fast Fourier transform (FFT), a process that is often made repeatedly and, if not automated, is quite laborious. This work presents a step-by-step procedure using Excel to perform these calculations, automating the process of obtaining the spectral electrochemical noise resistance, . This routine was used to analyze experimental potential and current noise data recorded for chalcopyrite. The results were comparable to those obtained for the same set of experimental data using Origin® software.

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.

Determination of the ferromagnetic component in stainless steels by the magnetodynamic method

2015 ◽  
Vol 51 (3) ◽  
pp. 131-137 ◽  
Author(s):  
A. A. Lukhvich ◽  
V. I. Sharando ◽  
A. K. Shukevich ◽  
K. I. Yanushkevich
Keyword(s):  
Stainless Steels ◽  
Ferromagnetic Component ◽  
Magnetodynamic Method
Sign in / Sign up

Export Citation Format

Share Document