铁基牺牲阳极对17-4PH不锈钢的阴极保护

采用两种铁基牺牲阳极材料 (20CrMo和40CrMo) 对17-4PH不锈钢进行阴极保护,通过恒电流实验和自放电实验评估这两种牺牲阳极的保护效果,并用扫描电镜 (SEM) 和能谱 (EDS) 分析17-4PH阴极实验后的表面形态和元素成分。结果表明：两种牺牲阳极对17-4PH不锈钢均有500 mV左右的驱动电位。20CrMo牺牲阳极具有比40CrMo更负的工作电位、更大的电流效率,20CrMo牺牲阳极表面均匀腐蚀。经过20CrMo阳极保护的17-4PH阴极表面形成的氧化产物含量更少。20CrMo对17-4PH不锈钢的保护效果更好。

Fe-based Sacrificial Anodes for Cathodic Protection of 17-4PH Stainless Steel

As sacrificial anode material for 17-4PH stainless steel, the cathodic protection performance of two Fe-based alloys 20CrMo and 40CrMo was evaluated by means of galvanostatic test and self-discharge test. Then the surface morphology of 17-4PH cathodes was characterized by scanning electron microscope (SEM) with energy dispersive spectrometer (EDS). Experimental result indicates that both the 20CrMo and 40CrMo anodes had a driving voltage around 500 mV. The 20CrMo sacrificial anode presented much stable and negative working potential and uniform corrosion rather than 40CrMo sacrificial anode. The 17-4PH cathode protected by 20CrMo had less rust product on its surface. In other word, the 20CrMo sacrificial anode has a better protective effect on 17-4PH stainless steel.