化学气相沉积Cr/DLC薄膜对Mg-Gd-Y合金耐蚀性能的改善  

Study on the Improvement of Corrosion Resistance of Mg-Gd-Y Alloys through Chemical Vapor Deposition of Cr/DLC films

作　　者：何明格 刘文博[2] 杨柳青 贺秋云 张明友 袁艺绮 杨川琴 何博 HE Mingge;LIU Wenbo;YANG Liuqing;HE Qiuyun;ZHANG Mingyou;YUAN Yiqi;YANG Chuanqin;HE Bo(PetroChina Chuanqing Drilling Engineering Co.,Ltd.,Chengdu 610065,China;School of Mechanical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]中国石油川庆钻探工程有限公司,四川成都610065 [2]四川大学机械工程学院,四川成都610065

出　　处：《材料保护》2024年第10期126-133,共8页Materials Protection

摘　　要：Mg-Gd-Y合金作为一种优秀工程材料在石油天然气勘探开发中具有广泛应用。为了改善其在井下工作服役时的耐蚀性能,研究了以Cr为过渡层的类金刚石薄膜(DLC)对Mg-Gd-Y合金耐蚀性能的影响。采用等离子体增强化学气相沉积(PECVD)法制备了以Cr元素为过渡层的类金刚石薄膜,采用拉曼光谱分析DLC膜层的碳结构类型,采用3.5%(质量分数)NaCl盐雾腐蚀试验、电化学极化测试及接触角测试评价了试样的耐蚀性能,采用SEM分析了试样腐蚀前后的表面形貌及断面形貌。结果表明:由拉曼光谱检测数据计算得出,Cr/DLC薄膜的I_D/I_G值为0.64,说明膜层中sp~3杂化键所占比例较多,且组织致密,因此Cr/DLC薄膜在3.5%NaCl溶液中的腐蚀倾向和腐蚀速率降低。Cr/DLC薄膜有效提高了镁合金基体的耐蚀能力。Mg-Gd-Y alloys,as an excellent engineering material,have extensive applications in the exploration and development of petroleum and natural gas.In order to improve the corrosion resistance of Mg-Gd-Y alloy in underground service,the effect of diamond-like carbon(DLC)with Cr as a transition layer on the corrosion resistance of the Mg-Gd-Y alloy was investigated.The diamond-like carbon film with Cr as the transition layer was prepared using the PECVD method.The carbon structure type of the DLC film layer was analyzed using Raman spec-troscopy.The corrosion resistance of the sample was evaluated through 3.5%(mass fraction)NaCl salt spray corrosion test,electrochemical polarization test,and contact angle test.The surface morphology and cross-sectional morphology of the sample before and after corrosion were analyzed using scanning electron microscopy(SEM).Results showed that the ID/IG value of the Cr/DLC film was 0.64,calculated from the Raman spectroscopy data,indicating that the sp3 hybridized bonds in the film layer were found to account for a larger proportion and that the structure was denseꎻtherefore,the corrosion tendency and corrosion rate of the Cr/DLC film in 3.5%NaCl solution decreased.The corrosion resistance of the magnesium alloy substrate was effectively improved by the Cr/DLC film.

关 键 词：镁合金 Cr/DLC膜层 耐蚀性能 PECVD 

分 类 号：TG174.4[金属学及工艺—金属表面处理]