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。
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.
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