SiC含量对SiC_(P)/6092铝基复合材料微弧氧化膜耐蚀性的影响  

Effect of SiC Content on Microstructure and Corrosion Resistance of Micro-arc Oxidation Film on Composites SiC_(P)/6092 Al-alloy

作　　者：于文静 刘春忠 张洪亮 卢天倪 王东[2] 李娜 黄震威 YU Wenjing;LIU Chunzhong;ZHANG Hongliang;LU Tianni;WANG Dong;LI Na;HUANG Zhenwei(Materials Science and Engineering,Shenyang Aerospace University,Shenyang 110136,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳航空航天大学材料科学与工程学院,沈阳110136 [2]中国科学院金属研究所,沈阳110016

出　　处：《材料研究学报》2025年第2期153-160,共8页Chinese Journal of Materials Research

摘　　要：在基体中不同SiC含量的SiC_(P)/6092铝基复合材料表面制备微弧氧化膜,使用XRD、SEM和电化学等手段对其表征,研究了SiC含量对氧化膜耐蚀性能的影响。结果表明:这种氧化膜分为致密层和外部疏松层,主要由α-Al_(2)O_(3)、γ-Al_(2)O_(3)和Mullite(Al_(6)Si_(2)O_(13))组成。氧化膜的表面有微小的孔洞,孔隙直径和粗糙度随着SiC含量的提高而减小。随着基体中SiC颗粒含量的提高氧化层的生长速度降低,但是不会分解参与反应。随着SiC含量的提高,氧化膜中疏松层的厚度先减小后增大,致密层的厚度先增大后减小。SiC颗粒含量(体积分数)为17%的SiC_(P)/6092铝基复合材料其表面氧化膜的耐蚀性能最好,腐蚀电压达到-0.466 V、腐蚀电流达到3.82×10^(-9)A·cm^(-2),极化电阻达到1.0×10^(5)Ω·cm^(2)。Composites of SiC_(P)/6092 Al-alloy with 0%,17% and 30% SiC(volume fraction)were prepared by powder metallurgy,and then micro-arc oxidation films were made on the composites in sodium silicate electrolyte via micro-arc oxidation facility with an adjustable double pulse power supplier,and then the microstructure and composition,as well as the corrosion resistance of the micro-arc oxidation films were characterized by XRD,SEM,and Auto-Lab methods.The results show that the prepared films composed of an inner dense layer and an external loose layer,which are mainly composed of α-Al_(2)O_(3),γ-Al_(2)O_(3) and Mullite.There are many tiny pores on the film surface,and the pore diameter and surface roughness decrease with the increase of SiC content in the matrix.The SiC particles in the matrix have an inhibitory effect during the micro arc oxidation process,thus the growth of the oxide films slows down with the increase of SiC content,but the SiC particles do not decompose to participate in the oxidation reaction.The thickness of the loose layer decreases first and then increases with the increase of SiC content,and the thickness of the dense layer increases first and then decreases with the increase of SiC content.Among others,the oxide film on the composite of SiC_(P)/6092 Al-alloy with 17% SiC(volume fraction)particles had the best corrosion resistance with free corrosion potential of -0.466 V,corrosion current density of 3.82×10^(-9) A·cm^(-2) and polarization resistance of 1.0×10^(5)Ω·cm^(2).

关 键 词：材料表面与界面 膜层生长 微弧氧化 SiC_(P)/Al复合材料 耐蚀性 

分 类 号：TB306[一般工业技术—材料科学与工程]