外加電位對(duì)X90鋼及其焊縫在近中性土壤模擬溶液中應(yīng)力腐蝕行為的影響
發(fā)布時(shí)間：2018-07-28 14:26
【摘要】：采用慢應(yīng)變速率拉伸(SSRT)實(shí)驗(yàn)、動(dòng)電位極化技術(shù)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(hù)電位下的應(yīng)力腐蝕行為。結(jié)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(yīng)力腐蝕敏感性,裂紋擴(kuò)展為穿晶腐蝕裂紋;應(yīng)力腐蝕開裂(SCC)的裂紋萌生與擴(kuò)展與外加保護(hù)電位有關(guān)。在開路電位(OCP)~-1000 m V的電位范圍內(nèi),X90鋼的SCC機(jī)制均為陽(yáng)極溶解(AD)+氫脆(HE)的混合機(jī)制;在OCP下,由于AD作用較強(qiáng),SCC敏感性較明顯;在-800 m V下,由于AD和HE作用均較弱,導(dǎo)致SCC敏感性最低;而在-900 m V時(shí),由于HE作用明顯增強(qiáng),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(xué)腐蝕與防護(hù)中心;北京科技大學(xué)腐蝕與防護(hù)教育部重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院寧波材料技術(shù)與工程研究所;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目No.2014CB643300 國(guó)家自然科學(xué)基金項(xiàng)目Nos.51471034和51131001 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)項(xiàng)目No.FRF-TP-15-047A3~~
【分類號(hào)】：TG172.9
本文編號(hào)：2150516
[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(xué)腐蝕與防護(hù)中心;北京科技大學(xué)腐蝕與防護(hù)教育部重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院寧波材料技術(shù)與工程研究所;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目No.2014CB643300 國(guó)家自然科學(xué)基金項(xiàng)目Nos.51471034和51131001 中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)項(xiàng)目No.FRF-TP-15-047A3~~
【分類號(hào)】：TG172.9
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