【摘要】：采用慢應變速率拉伸(SSRT)實驗、動電位極化技術和SEM觀察等方法,研究了X90鋼基體和焊縫在近中性土壤模擬溶液中不同陰極保護電位下的應力腐蝕行為。結果表明,X90管線鋼及其焊縫組織在近中性土壤模擬溶液中均具有一定的應力腐蝕敏感性,裂紋擴展為穿晶腐蝕裂紋;應力腐蝕開裂(SCC)的裂紋萌生與擴展與外加保護電位有關。在開路電位(OCP)~-1000 m V的電位范圍內,X90鋼的SCC機制均為陽極溶解(AD)+氫脆(HE)的混合機制;在OCP下,由于AD作用較強,SCC敏感性較明顯;在-800 m V下,由于AD和HE作用均較弱,導致SCC敏感性最低;而在-900 m V時,由于HE作用明顯增強,具有最高的SCC敏感性;在相同電位條件下,焊縫的SCC敏感性高于母材。
[Abstract]:The stress-corrosion behavior of X90 steel under different cathodic protection potentials in simulated solution of near-neutral soil was studied by means of slow strain rate tensile (SSRT) test, potentiodynamic polarization technique and SEM observation. The results show that the microstructure of X90 pipeline steel and its weld seam are sensitive to stress corrosion in near-neutral soil simulated solution and the crack propagation is transgranular corrosion crack. The crack initiation and propagation of stress corrosion cracking (SCC) is related to the applied protection potential. The SCC mechanism of X90 steel is the mixed mechanism of anodic dissolution of (AD) hydrogen embrittlement (HE) in the open circuit potential range of 1 000 MV, under OCP, the sensitivity of (AD) is obvious because of the strong effect of AD, and the effect of AD and HE is weak at -800 MV. The sensitivity of SCC is the lowest, but at -900mV, the sensitivity of SCC is the highest due to the obvious enhancement of HE, and the sensitivity of SCC in weld is higher than that of base metal under the same potential.
【作者單位】： 北京科技大學腐蝕與防護中心;北京科技大學腐蝕與防護教育部重點實驗室;中國科學院寧波材料技術與工程研究所;
【基金】：國家重點基礎研究發(fā)展計劃項目No.2014CB643300 國家自然科學基金項目Nos.51471034和51131001 中央高�；究蒲袠I(yè)務費專項項目No.FRF-TP-15-047A3~~
【分類號】：TG172.9

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