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

Authors

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

Corresponding Author

Chun-bo HUANG(huangcb@eastday.com)

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

2003-08-20

Received Date

2002-12-07

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