腐蚀与防护教学7

1234StressCorrosionCracking—SCC5Intergranularstresscorrosioncrackingof316stainlesssteelStresscorrosionfracturesurfaceof316stainlessDuctilefracturesurfaceof316stainlesssteelSheardimplesintheshear-lipzoneof316stainlesssteelSCCof316stainlesssteelCrosssectionof316stainlesssteel67SCCSCC:81SCCSCC2SCCSCCSCC9SCCNaOHH2SHClCOCO2H2OHCNNaClNH4+SO2NaCl290HCl1035H2SO467Cl2288346427N2O4O2NO2474KClK2CrO4HF103.111:90thSCC122.SCC133.:106103mm/min10610104.:14SCCSCCSCC151:a:SCCSCCSCC()bSCCcSCC162“”“”SCC173SCC1819SCCSCC20SCC:SCCSCC2122„„()„SNaNf.23„:„:N1071082425„„‰‰‰26‰‰‰2728129230„„„311.2.3.3233„:‰„‰34„3536„37„„„„381.2.pH3453940„4142„43„12345444546„1247abc484912345051220µm52„53„123455455„HydrogenInducedCrackingHIC.——5657581592⎟⎠⎞⎜⎝⎛∆−=RTHpCSHHexp22HHpkC=T⎟⎠⎞⎜⎝⎛∆−′=RTHkCSHexpp60„bccfcc61CLCT)()(TLHKH62EbEb0.6eVKEb0.6eVRTEBCCKbLTexp==6336465Cottrell“”661HHHHHH23VTiZrIVBVBTiHxx1.581.99Ni46768,().CH4SiH4IVBVB69„70„„.71„CFe3C„H2S7273„74CTCcrCTCcrCTCcrCTCcrCcrCT