(1. 西安理工大學(xué) 材料科學(xué)與工程學(xué)院，西安 710048；
2. 西安工業(yè)大學(xué) 材料與化工學(xué)院，西安 710032)
摘 要: 采用非平衡磁控濺射技術(shù)在鋁基軸承合金表面制備AlSn20/C復(fù)合鍍層，通過掃描電鏡形貌觀察、交流阻抗和極化曲線的測(cè)量研究石墨靶電流對(duì)鍍層組織與耐蝕性能的影響。結(jié)果表明：在電流0.2~0.8 A范圍內(nèi)，薄膜均以層狀結(jié)構(gòu)生長(zhǎng)，且電流越小，薄膜組織越致密；鍍膜后試樣的電化學(xué)阻抗比基體的高5~6個(gè)數(shù)量級(jí)，石墨靶電流為0.2 A時(shí)，可將基體的自腐蝕電位由−1.42 V提高到−1.18 V，石墨靶電流是影響AlSn20/C復(fù)合鍍層耐蝕性的一個(gè)重要因素，石墨靶電流越小，其耐蝕性越好。
關(guān)鍵字: 軸承合金；AlSn20/C鍍層；耐蝕性；自腐蝕電位
（1. Institute of Materials Science and Technology, Xi’an University of Technology, Xi’an 710048, China;
2. School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710032, China）
Abstract:The AlSn20/C composite films were deposited on the surface bearing alloy by non-equilibrium magnetron sputtering. The influence of carbon target current on the structure and corrosion resistance were studied by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and polarization curves. The results indicate that when the current is in the range of 0.2−0.8 A, the film is in layer structure, and the lower the current is, the compacter the film structure is. The composite coating can improve the electrochemical impedance by 5−6 order of magnitude. When the carbon target current is 0.2 A, the self-corrosion potential can be improved from −1.42 V to −1.18 V. The carbon target current is an important factor to affect the corrosion resistance of AlSn20/C composite coating, the lower the target current is, the better the corrosion resistance is.
Key words: bearing alloy; AlSn20/C composite coating; corrosion resistance; self-corrosion potential
