本文提出了一种测定应力腐蚀裂纹内的电位和 pH 值的方法。这种方法适用于应力腐蚀裂纹内和各种腐蚀缝隙内的电化学测试。设备简单,操作方便而且精确度高。文中列出用该法测定 LC-4铝合金应力腐蚀裂纹尖端处微区的电化学数据,并结合电位 pH 图进行了讨论和分析。作者根据所得结果提出由微电池相互耦合而成的多电极体系等效电路模型,可以较好地解释本文的实验结果。对于 LC-4铝合金,裂纹尖端电位与 pH 值间存在下列关系=-0.750-0.043pH(SCE)而在 Pourbaix 图中则穿过钝化区,并与应力腐蚀敏感性存在对应关系。
A new method for the determination of potential and pH value within the SCC cracks has been proposed.The simple device can be conveniently used to measure and follow the electrochemical behavior within the SCC cracks or any corrosion crevices with high accuracy. In this paper,both the results of the measurements within SCC cracks as well as crack tips of LC-4 aluminum alloy and a discussion with these data in relation to the potential-pH diagram of aluminum alloy were presented. The authors proposed an equivalent circuit model constructed by the couple of numerous corrosion microcells in accordance with the results of measure- ment to explain the data from our experiments.For aluminum alloy LC-4,the relationship between the pH and the crack tip potential will be: =-0.750-0.043 pH(SCE) In the Pourbaix diagram,the position of the corrosion system will extend through the region of passivity in response to the sensitivity of SCC of the alloy.
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