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以工厂换热器为研究背景,采用极化技术和自放电法,研究了不同温度下Zn-Al-Cd合金牺牲阳极和纯Zn阳极在地下井水和模拟海水中对20#钢的牺牲阳极电化学性能。开路电位、工作电位及极化曲线的测试结果表明:在30~80℃范围内,Zn-Al-Cd合金、纯Zn和20#钢在两种介质中均未出现电位极性逆转现象,牺牲阳极具有良好的电化学性能;Zn-Al-Cd合金在地下井水中生成的保护膜比模拟海水中的稳定;牺牲阳极合金成分的优化,可以有效防止电位逆转行为。
Taking the heat exchanger of the factory as the research background, the sacrificial anode of 20 # steel in underground well water and simulated seawater was studied by using the polarization technology and the self-discharge method at different temperature for sacrificial anode of Zn-Al-Cd alloy and pure Zn anode Electrochemical performance. The results of open circuit potential, working potential and polarization curves show that no reversal of the potential polarity occurs in Zn-Al-Cd alloys, pure Zn and 20 # steels at 30-80 ℃, The anode has good electrochemical performance. The protective film formed by Zn-Al-Cd alloy in underground well water is more stable than simulated seawater. The optimization of sacrificial anode alloy composition can effectively prevent the potential reversal behavior.