铁基非晶涂层在NaCl和H_2SO_4溶液中的钝化行为  

PASSIVATION BEHAVIOR OF Fe-BASED AMORPHOUS METALLIC COATING IN NaCl AND H_2SO_4 SOLUTIONS

作　　者：王勇[1,2] 郑玉贵[3] 王建强[4] 李美玲[5] 沈军[1] 

机构地区：[1]同济大学材料科学与工程学院,上海201084 [2]东北石油大学机械科学与工程学院,大庆163318 [3]中国科学院金属研究所核用材料与安全评价重点实验室,沈阳110016 [4]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016 [5]鞍山师范学院物理系,鞍山114001

出　　处：《金属学报》2015年第1期49-56,共8页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目51274151和51025415;中国博士后科学基金项目2014M551447;黑龙江省自然科学基金项目QC2013C056;黑龙江省教育厅科学技术研究项目12541079资助~~

摘　　要：采用超音速火焰喷涂(HVOF)方法制备了一种Fe Cr Mo Mn WBCSi非晶态合金涂层,测试并分析了非晶涂层组织、钝化膜成分及涂层在不同浓度Na Cl和H2SO4介质中的钝化行为,并与304不锈钢和ND钢进行对比.结果表明,非晶涂层由于钝化膜中高含量的Cr,Mo及W的氧化物,钝化区间宽,抗钝化膜破裂能力强,孔隙的存在降低其均匀腐蚀抗力.304不锈钢钝化膜破裂电位较低且与Na Cl溶液浓度密切相关.304不锈钢和ND钢只有在浓H2SO4溶液中具有较稳定的钝化特征,非晶结构有助于涂层在稀H2SO4溶液中形成更加稳定的钝化膜,厚度较小的涂层(200μm)具有较高的非晶相含量,形成的钝化膜较厚,耐蚀性更加优异.Amorphous alloy is a new type of material that exhibits exceptional properties or combinations of properties that are often not achievable in conventional crystalline materials. Fe-based amorphous alloys has attracted significant attention over the last few decades because of their low cost and enhanced mechanical performance.However, they are more suitable for the industrial application of coatings due to the fatal disadvantages of poor toughness. High velocity oxygen-fuel（HVOF） spraying is a good way to make amorphous alloy coatings（AMCs）,for the individual droplets are cooled at a rate of around 107K/s which is much higher than the critical cooling rate of the amorphous alloys during the thermal spraying. Fe-based AMCs obtained by using the HVOF spray method are important materials for industrial applications because of high glass- forming ability and exceptional performances, such as excellent corrosion resistance, high hardness, and superior wear resistance. In this work, FeCr Mo Mn WBCSi AMCs were prepared by HVOF thermal spray. The microstructure and amorphous characteristics of AMCs were characterized by SEM and XRD. Electrochemical corrosion behavior of AMCs was investigated in different concentration of Na Cl and H2SO4 solutions compared with that of 304 stainless steel and ND steel. The surface film of materials after immersed in two solutions was analysed by XPS. The results indicated that HVOF thermal spraying Fe-based AMCs presented dense layered structure, high amorphous phase content and low porosity. The composite structure of AMCs was formed with some nanocrystallite phases embedded in the amorphous matrix. AMCs exhibited better resistance to pitting corrosion and relatively low uniform corrosion resistance due to the porosity, while the pitting potential of 304 stainless steel was sensitive to Na Cl concentration. XPS results revealed that the presence of Cr, Mo and W oxides in the passive film of AMCs may result in the better corrosion resistance. The enrichment of Mo4 ＋oxides on the

关 键 词：非晶涂层 超音速火焰喷涂 钝化 电化学腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]