X80鋼?dān)椞锻寥滥M溶液中應(yīng)力腐蝕裂紋擴(kuò)展行為機(jī)理
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-06-03
采用電化學(xué)極化曲線測試、EIS 測試、裂紋擴(kuò)展實驗和SEM分析研究了X80 管線鋼在鷹潭土壤溶液環(huán)境下的應(yīng)力腐蝕裂紋(SCC)擴(kuò)展行為及機(jī)理.
X80鋼?dān)椞锻寥滥M溶液中應(yīng)力腐蝕裂紋擴(kuò)展行為機(jī)理GROWTH BEHAVIOR AND MECHANISM OF STRESS CORROSION?CRACKS OF X80 PIPELINE STEEL IN SIMULATED YINGTAN SOIL?SOLUTION?采用電化學(xué)極化曲線測試、EIS 測試、裂紋擴(kuò)展實驗和SEM分析研究了X80 管線鋼在鷹潭土壤溶液環(huán)境下的應(yīng)力腐蝕裂紋(SCC)擴(kuò)展行為及機(jī)理. 結(jié)果表明, X80 管線鋼在酸性土壤環(huán)境中的裂紋擴(kuò)展速率隨著外加電位的降低呈現(xiàn)增加趨勢, 相較于開路電位下的裂紋擴(kuò)展, 在裂紋擴(kuò)展初期, -850 mV下裂紋擴(kuò)展速率較大, 而在裂紋快速擴(kuò)展階段, 過保護(hù)電位-1200 mV下裂紋擴(kuò)展速率更大; 同時X80管線鋼在酸性土壤環(huán)境中的SCC裂紋擴(kuò)展機(jī)制也隨著施加外加電位的不同而改變, 在外加電位高于約-930 mV時為陽極溶解與氫脆的混合機(jī)制, 負(fù)于-930 mV時則為氫脆機(jī)制.?
Stress corrosion cracking (SCC) behavior and mechanism of X80 pipeline steel in the simulated?solution of Yingtan in China was investigated with electrochemical polarization curves, EIS, slow-rate-loading?crack-growth test and SEM. Results showed that the applied polarization potential played an important role in?SCC growth behavior and mechanism of X80 pipeline steel in the simulated solution of the acid soil environment.?With the decreasing of the applied potential, the crack propagation rate increased constantly. In comparison to the?crack propagation at the open circuit potential, the cracks extended faster in the initial stage of crack propagation?when the applied potential was -850 mV; nevertheless, in the rapid propagation stage, the rate of its propagation?was magnified with the application of -1200 mV potential. In addition, the crack propagation mode varied with?different applied potentials: it was mixed-controlled by both anodic dissolution (AD) and hydrogen embrittlement?(HE) when the applied potential was more positive than -930?mV, and only in control of HE when the potential was less?than -930 mV.
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