An Electrochemical Prediction Method for Caustic SCC of Fe-Cr-Ni Alloy

Authors

Chun-bo HUANG, Shanghai Research Institute of Materials. Shanghai 200437, China;
Zhan-peng LV, Shanghai Research Institute of Materials. Shanghai 200437, China;
Wu YANG, Shanghai Research Institute of Materials. Shanghai 200437, China;

Abstract

Stress corrosion cracking (SCC) of Fe_Cr_Ni alloy (alloy 800 M) in hot concentrated caustic solution was investigated by means of tests of C_rings under controlled potentials. The steady dissolution current densities( i st ) of the plate specimens and C_rings polarized potentiostatically were measured. The simplifed steady potentiostatical curves were drawn on the basis of i st . The ratio R PD measured from i st and steady passive current density i p at low potentials ( R PD = i st / i p ) was designed as a polarization dissolution susceptibility parameter. The parameter R PD values of both plate and C_ring specimens were similar to SCC sensetive potentials of C_rings between-30 mV/SCE and 40 mV/SCE. An Electrochemical prediction method for caustic SCC was proposed basd on the electrochemical characters synthesizing i st and R PD .

Keywords

Fe_Cr_Ni alloy, Steady dissolution current, Polarization dissolution susceptibility parameter, Caustic stress corrosion cracking, Electrochemical prediction

DOI Link

https://doi.org/10.61558/2993-074X.1517

Publication Date

2003-08-28

Online Available Date

2003-08-28

Revised Date

2003-08-28

Received Date

2003-08-28

Recommended Citation

Chun-bo HUANG, Zhan-peng LV, Wu YANG. An Electrochemical Prediction Method for Caustic SCC of Fe-Cr-Ni Alloy[J]. Journal of Electrochemistry, 2003 , 9(3): 292-298.
DOI: 10.61558/2993-074X.1517
Available at: https://jelectrochem.xmu.edu.cn/journal/vol9/iss3/5

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