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 .


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

Publication Date


Online Available Date


Revised Date


Received Date



[1] YangXi_zhen,YangWu.ElectrochemicalThermodynamicsofMetallicCorrosion:Potential_pHDiagramsandTheirApplication[M].Beijing:ChemicalIndustryPress,1991(inChinese).

[2] ParkinsRN ,HolyrodNJH .Streecorrosioncrackingof70/30brassinacetate,formate,tartrateandhydroxidesolutions[J].Corrosion,1982,38:245.

[3] ParkinsRN .Mechanisticaspectsofintergranularstresscorrosioncrackingofferriticsteels[J].Corrosion,1996,52:363.

[4] FangZ ,StaehleRW .Effectsofthevalenceofsulfuronpassivationofalloys600,690and800at25℃and95℃[J].Corrosion,1999,55(4):355~379.

[5] YangWu,LuZP ,HuangDL ,etal.Causticstresscorrosioncrackingofnickel_rich,chromium_bearingal loys[J].CorrosionScience,200143,(5):963~977.

[6] YangWu,KongDS ,ZhaoGZ ,etal.Causticstresscorrosioncrackingofalloy800,Part1.theeffectofap pliedpotential[J].JournalofChineseSocietyforCorrosionAndProtection(inChinese),1997,17(3):181.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.