腐蚀缝隙内电化学行为的初步理论探讨——Ⅱ.模拟腐蚀缝隙内电位、pH和Cl~-浓度的分布与极化电位及时间的关系

中国腐蚀与防护学报

1986, Vol. 6

Issue (3): 21-30

研究报告

本期目录 | 过刊浏览

腐蚀缝隙内电化学行为的初步理论探讨——Ⅱ.模拟腐蚀缝隙内电位、pH和Cl~-浓度的分布与极化电位及时间的关系

黄子勋;李德林;翟金坤

北京航空学院;北京航空学院;北京航空学院

A THEORETICAL APPROACH OF THE ELECTROCHEMICAL BEHAVIOR WITHIN CORROSION CREVICE Ⅱ. THE DEPENDENCE OF POTENTIAL, PH AND C(?)CONCENTRATION WITHIN CREVICE ON APPLIED POLARIZATION POTENTIAL AND TIME

Huang Zixun Li Delin and Jai Jinkun (Beijing Institute of Aeronautics and Astronautics; Beijing China)

全文: PDF(886 KB)

摘要: 本文用设计的模拟缝隙,连续测试了受力和不受力情况下电位,pH和Cl~-浓度在不同极化电位随时间的变化和沿缝深的分布。结果表明:1.电位沿缝深方向的分布梯度随极化增大而增大,阳极极化时缝内电位变化很小,阴极极化时起初变化较大,经过一临界极化后变化很小;2.pH随时间的变化规律与电位随时间的变化相同,缝内电位对PH的影响呈线性关系:pH=-4-40/3E:3.Cl~-浓度在极化初期增加速率较快,然后减慢,最后趋于稳定,Cl~-的浓集倍数与缝内电位成直线关系:[Cl~-]x=17+21E;4.受力状态下,缝内电位和pH随时间起伏变化,电位变化幅度达70mV左右,pH变化幅度达1.5左右;5.应力对Cl~-浓集影响不大。将所得关系式和上文中数学模型结合起来,通过测试缝外电位,就可估算缝内任一点的电位,pH和Cl~-浓度。

Abstract：The potential, pH and Cl~- concentration changes of a modulated crevice were measured simultaneously at the distance oi 4, 8, 13.5 and 18.5 mm from the crevice opening. The distribution of potential, pH and Cl~-concentration along the crevice and their changes with time in the presence and absence of stress were recorded in 3.5%NaCl solution for 3oCrMnSiA specimens. Results showed that in the absence of applied stress potential gradient increased with applied polarizaton potential, and the relationships between pH, Cl~- and crevice potential were: pH=-4-(40)/3E and [Cl~-]x=17+21E; whereas in the presence of applied stress,potential and pH change fluctunatly with time, the maximum change in potential was 70mV and that in pH was 1.5 respectively, while Cl~- concentration remained unchanged.

收稿日期: 1986-06-25

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黄子勋;李德林;翟金坤. 腐蚀缝隙内电化学行为的初步理论探讨——Ⅱ.模拟腐蚀缝隙内电位、pH和Cl~-浓度的分布与极化电位及时间的关系[J]. 中国腐蚀与防护学报, 1986, 6(3): 21-30.
. A THEORETICAL APPROACH OF THE ELECTROCHEMICAL BEHAVIOR WITHIN CORROSION CREVICE Ⅱ. THE DEPENDENCE OF POTENTIAL, PH AND C(?)CONCENTRATION WITHIN CREVICE ON APPLIED POLARIZATION POTENTIAL AND TIME. J Chin Soc Corr Pro, 1986, 6(3): 21-30.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1986/V6/I3/21

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