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通过室内模拟实际油气井工况环境,在70℃对Al-Zn-In-Sn-Mg牺牲阳极和Al-Zn-In-Cd牺牲阳极两组配方的试样进行恒电流极化,开展开路电位、工作电位和极化曲线等电化学测试。同时对腐蚀后的阳极表面形貌及产物微观形貌进行了观察。结果表明:Al-Zn-In-Sn-Mg牺牲阳极开路电位较Al-Zn-In-Cd阳极负,具有较大的驱动电压。当对Al-Zn-In-Sn-Mg阳极施加恒电流极化后,其表面一直处于活化状态,溶解状态良好,电流效率高达58%左右。
Through simulating actual working conditions of oil and gas wells indoors, the samples of two groups of Al-Zn-In-Sn-Mg sacrificial anode and Al-Zn-In-Cd sacrificial anode were galvanostatically galvanized at 70 ℃, , Working potentials and polarization curves and other electrochemical tests. At the same time, the corrosion of the anode surface morphology and product morphology were observed. The results show that the open-circuit potential of Al-Zn-In-Sn-Mg sacrificial anode is negative than that of Al-Zn-In-Cd anode, and has a large driving voltage. When the constant current polarization is applied to the Al-Zn-In-Sn-Mg anode, the surface of the Al-Zn-In-Sn-Mg anode is always in the activated state and the dissolution state is good, and the current efficiency is as high as 58%.