用快慢扫描极化测量等方法研究X70钢和16Mn钢在Na2CO3/NaHCO3溶液中电化学行为。分析溶液中NaHCO3浓度、PH、供氧状况及扫描速度等因素对极化曲线影响，并研究其饨化过程的各种电极反应。结果表明，管道钢在高浓度Na2CO3/NaHCO3溶液中阳极极化曲线含两个阳极峰和中间过渡区。较负的第一阳极峰电位和较大的峰电流有利SCC发生，而它们和较高HCO3-学度、适中pH范围（室温下6.7-11)和供氧不足的溶液环境相联系.
The electrochemical behaviors of X70 and 16Mn pipeline steels were studied in a range of CO32-/HCO3- solutions using the fast and slow sweep potentiodynamic polarization measurements and so on. Effects of the bicarbonate concentration,pH,oxygen concentration in the solution and the sweep rate et al.On the polarization curves were analyzed.The electrode reactions in passive process were also investigated.It was shown that the anodic polarization curves of steels in cincentrated CO32- / HCO3- solutions exhibited characteristic features,namely two oxidation peaks and an intermediate zone between. The situations with more negative potential of first oxidation peak and larger currents in first oxidation peak are likely to promote SCC.These situation are also linked to high concentration HCO3-,moderate pH range (6.7-11 at ambient temperature )and lack of oxygen in solutions.
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