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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 m V左右的驱动电位。20Cr Mo牺牲阳极具有比40Cr Mo更负的工作电位、更大的电流效率,20Cr Mo牺牲阳极表面均匀腐蚀。经过20Cr Mo阳极保护的17-4PH阴极表面形成的氧化产物含量更少。20Cr Mo对17-4PH不锈钢的保护效果更好。
Two types of Fe-based sacrificial anode materials (20CrMo and 40CrMo) were used to cathodically protect 17-4PH stainless steel. The protective effects of these two kinds of sacrificial anodes were evaluated by galvanostatic experiments and self-discharge experiments. SEM and EDS EDS) analysis of the surface morphology and elemental composition of the 17-4PH cathode experiment. The results show that both sacrificial anodes have a driving potential of about 500 mV for 17-4PH stainless steel. The 20Cr Mo sacrificial anode has a more negative working potential than 40Cr Mo, with greater current efficiency and uniform corrosion of the sacrificial anode surface at 20Cr Mo. The 17-4PH cathodes protected by 20Cr Mo anodes formed less oxidation products. 20Cr Mo 17-4PH stainless steel to protect the better.