X80鋼鷹潭土壤模擬溶液中應力腐蝕裂紋擴展行為機理
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-06-03
采用電化學極化曲線測試、EIS 測試、裂紋擴展實驗和SEM分析研究了X80 管線鋼在鷹潭土壤溶液環境下的應力腐蝕裂紋(SCC)擴展行為及機理.
X80鋼鷹潭土壤模擬溶液中應力腐蝕裂紋擴展行為機理GROWTH BEHAVIOR AND MECHANISM OF STRESS CORROSION?CRACKS OF X80 PIPELINE STEEL IN SIMULATED YINGTAN SOIL?SOLUTION?采用電化學極化曲線測試、EIS 測試、裂紋擴展實驗和SEM分析研究了X80 管線鋼在鷹潭土壤溶液環境下的應力腐蝕裂紋(SCC)擴展行為及機理. 結果表明, X80 管線鋼在酸性土壤環境中的裂紋擴展速率隨著外加電位的降低呈現增加趨勢, 相較于開路電位下的裂紋擴展, 在裂紋擴展初期, -850 mV下裂紋擴展速率較大, 而在裂紋快速擴展階段, 過保護電位-1200 mV下裂紋擴展速率更大; 同時X80管線鋼在酸性土壤環境中的SCC裂紋擴展機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制, 負于-930 mV時則為氫脆機制.?
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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