CAJ | 학술논문

为了提高镁合金的耐蚀性，本文利用扫描电镜分析了Mg-9Gd-3Y（GW93）镁稀土合金表面等离子电解氧化陶瓷层、等离子电解氧化-电泳复合膜层和电泳膜层的表面与纵截面形貌组织，利用傅立叶红外光谱仪（FT-IR）分析了电泳膜层有机官能团类型，用电化学测试手段和盐雾试验方法测试了该合金不同处理膜层的耐蚀性，讨论了电泳电压和固体粉料分数对等离子电解氧化-电泳复合膜层厚度、成膜速率和耐蚀性的影响。研究结果表明，随着电压、固体份的升高，等离子电解氧化-电泳复合涂层厚度和成膜速率呈增大趋势，腐蚀速率随着电压升高呈先减小后增大的趋势，随着固体份的增加呈降低趋势。电泳电压为70 V ，固体份为19％时，在等离子电解氧化膜层上生成陶瓷层与有机化合物层结合紧密的等离子电解氧化-电泳复合膜层，腐蚀电流密度比等离子电解氧化膜层降低两个数量级，自腐蚀电位正移200 mV ，耐蚀性提高近13倍。
위료제고미합금적내식성，본문이용소묘전경분석료Mg-9Gd-3Y（GW93）미희토합금표면등리자전해양화도자층、등리자전해양화-전영복합막층화전영막층적표면여종절면형모조직，이용부립협홍외광보의（FT-IR）분석료전영막층유궤관능단류형，용전화학측시수단화염무시험방법측시료해합금불동처리막층적내식성，토론료전영전압화고체분료분수대등리자전해양화-전영복합막층후도、성막속솔화내식성적영향。연구결과표명，수착전압、고체빈적승고，등리자전해양화-전영복합도층후도화성막속솔정증대추세，부식속솔수착전압승고정선감소후증대적추세，수착고체빈적증가정강저추세。전영전압위70 V ，고체빈위19％시，재등리자전해양화막층상생성도자층여유궤화합물층결합긴밀적등리자전해양화-전영복합막층，부식전류밀도비등리자전해양화막층강저량개수량급，자부식전위정이200 mV ，내식성제고근13배。
The samples of Mg-9Gd-3Y(GW93) Mg alloy were coated with plasma electrolytic oxidation (PEO) ,electrophoretic deposition (EPD) and PEO-EPD processes respectively .Varius coating surface and cross-section morphologies ,organic functional structure and the corresponded corrosion resistance were studied using scanning electron microscopy (SEM ) ,Fourier transform infrared spectrometer , electrochemical and salt spray tests .The effect of voltage and solids fraction in electrodeposition solution on the thickness ,forming rate and corrosion resistance of PEO-EPD composite coating was discussed and compared with those of PEO and EPD only .The results showed that thickness and film forming rate of PEO-EPD composite coating increased with the increase of voltage and solids ,the corrosion rate increased first ,then decreased with the increase of voltage ;however ,the corrosion rate is decreased with the increase of solids .The PEO-EPD composite film consists of ceramic zone ,which formed during PEO process ,and the organic compound zone ,which formed by EPD process .The organic compound zone is bonded closely with the PEO zone in the optimum EPD condition of voltage 70 V ,solids fraction 19% . Compared with PEO coating only ,the corrosion current density of composite coating significantly decreased by two orders of magnitude ,the corrosion potential moved positively more than 200 mV ,and the corrosion resistance improved up to 13 times .