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| STRESS CORROSION CRACKING OF 45MnSiV PRE-STRESSING STEEL |
| Wang Zheng Du Xiwei (Zhengzhou Institute of Technology) |
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Abstract The stress corrosion cracking (SCC) behavior of 45MnSiV pre-stressing high strength steel has been studied with slow strain rate tests (SSRT),electro-chemical and fractographic techniques.The SSRT were performed in saturated Ca(OH)_2 solutons,at various applied potentials from-1200 to-400mV(SCE).Some HCl was added to the solution in order to adjust the pH within the range 12.5～5.In addition,the cases that concrete has been polluted by Cl~- ion or SO_2 have also been investigated.The experiments are so designed as to truthfully imitating the service conditions of steel in concrete.The re- suits have shown that no SCC of 45MnSiV pre-stressing steel was observed in the concrete which has not been polluted.If some HCI.NaCl or SO_2 penetrate the concrete and decrease the pH value,SCC which appears to be related to anedic dissolution occurs.The best ca- thodic protection potential is in the vicinity of-800mV (SCE).Howevr,if the applied po- tential is lower than-900mV(SCE),cracking will occur which results from the ingress of hydrogen into steel,irrespective of any other conditions.
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Received: 25 February 1991
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