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http://dx.doi.org/10.14773/cst.2013.12.5.220

Uncertainty evaluation in electrochemical noise resistance measurement  

Kim, Jong Jip (Center for New Functional Materials Metrology, Korea Research Institute of Standards and Science)
Kang, Su Yeon (Center for New Functional Materials Metrology, Korea Research Institute of Standards and Science)
Publication Information
Corrosion Science and Technology / v.12, no.5, 2013 , pp. 220-226 More about this Journal
Abstract
The uncertainty in statistical noise resistance measurement was evaluated for a type 316 stainless steel in NaCl solutions at room temperature. Sensitivity coefficients were determined for measurands or variables such as NaCl concentration, pH, solution temperature, surface roughness, inert gas flow rate and bias potential amplitude. The coefficients were larger for the variables such as NaCl concentration, pH, inert gas flow rate and solution temperature, and they were the major factors increasing the combined standard uncertainty of noise resistance. However, the contribution to the uncertainty in noise resistance measurement from the above variables was remarkably low compared to that from repeated measurements of noise resistance, and thus, it is difficult to lower the uncertainty in noise resistance measurement significantly by lowering the uncertainties related with NaCl concentration, pH, inert gas flow rate and solution temperature. In addition, the uncertainty in noise resistance measurement was high amounting to 17.3 % of the mean, indicating that the reliability in measurement of noise resistance is low.
Keywords
electrochemical noise; noise resistance; uncertainty; sensitivity coefficient;
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  • Reference
1 ISO, Guide to the Expression of Uncertainty in Measurement (1993).
2 J. J. Kim, Corros. Sci. Tech.. 8, 193 (2009).
3 URAMET, Guidelines on the estimation of uncertainty in hardness Measurements, v2.0 (2011).
4 W. Gabauer, The determination of uncertainties in tensile testing, Code of Practice, No 7, issue 1 (2000).
5 J. J. Kim, Corros. and protect., 6, 54 (2007).
6 J. J. Kim, Met. Mat. Int., 15, 279 (2009).   DOI   ScienceOn
7 A. U. Malik, P. C. M. Kutty, N. A. Siddiqi. I. N. Anduani and S. Ahmed, Corros. Sci., 33, 1809 (1992).   DOI   ScienceOn