B30铜镍合金表面植酸转化膜的制备工艺研究  

Preparation Process of Phytic Acid Conversion Film on B30 Cu-Ni Alloy

作　　者：常钦鹏 陈友媛[1,2,3] 安振东 王磊 CHANG Qinpeng;CHEN Youyuan;AN Zhendong;WANG Lei(College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100;Key Laboratory of Marine Environment and Ecology of Ministry of Education,Ocean University of China,Qingdao 266100;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Ocean University of China,Qingdao 266100;Sunrui Marine Environment Engineering Co.,Ltd.,Qingdao 266101;Qingdao Municipal Engineering Design and Research Institute Co.,Ltd.,Qingdao 266061)

机构地区：[1]中国海洋大学环境科学与工程学院,青岛266100 [2]中国海洋大学海洋环境与生态教育部重点实验室,青岛266100 [3]中国海洋大学山东省海洋环境地质工程重点实验室,青岛266100 [4]青岛双瑞海洋环境工程股份有限公司,青岛266101 [5]青岛市市政工程设计研究院有限责任公司,青岛266061

出　　处：《材料导报》2019年第23期3876-3881,共6页Materials Reports

基　　金：山东省重点研发计划(2017GSF17119)~~

摘　　要：为提高B30铜镍合金表面植酸转化膜的耐蚀性,采用扫描电镜、动电位极化曲线、电化学阻抗谱等方法研究了浸泡时间、植酸浓度和钼酸盐浓度对B30铜镍合金表面植酸转化膜的表面形貌及在3.5%NaCl溶液中缓蚀率的影响。结果表明,植酸转化膜的缓蚀率随着浸泡时间的延长而逐渐增大,但浸泡时间超过12 h后植酸转化膜表面出现龟裂,破坏了转化膜表面覆盖的完整性,缓蚀率降低。植酸转化膜的缓蚀率随植酸浓度的增大而增大,当植酸浓度超过10 mmol/L时,植酸转化膜微观形貌疏松多孔,缓蚀率随植酸转化膜致密性的下降而降低。向植酸溶液中添加钼酸钠后转化膜的缓蚀率随着钼酸盐浓度的增大而增大,当钼酸钠浓度超过50 mg/L时,转化膜的缓蚀率开始降低。因此,不同浸泡时间和植酸浓度会对B30铜镍合金表面植酸转化膜的完整性和致密性产生影响,从而影响其耐蚀性。通过钼酸盐与植酸复配可以进一步提高植酸转化膜的耐蚀性。A iming at improving the corrosion resistance of phytic acid conversion film on the surface of B30 Cu-Ni alloy,scanning electron microscope(SEM),potentiodynamic polarization method and electrochemical impedance spectroscopy(EIS)were employed to investigate the effects of immersion duration,phytic acid concentration and molybdate concentration on the microstructure of the conversion film on B30 Cu-Ni alloy and its corrosion inhibition efficiency in 3.5%NaCl solution.The results indicated that the corrosion inhibition efficiency of phytic acid conversion film increased gradually with the extension of immersion duration.While the immersion duration exceeded 12 h,cracks appeared on the surface of phytic acid conversion film,which destroyed the integrity of the film and leaded to the decrease of corrosion resistance.Moreover,the corrosion inhibition efficiency of phytic acid conversion film improved with the increasing phytic acid concentration.When the phytic acid concentration exceeded 10 mmol/L,the microstructure of phytic acid conversion film became loose and porous,and its corrosion inhibition efficiency declined because of the poor compactness of the film.Besides,with the addition of sodium molybdate,composite conversion film was formed and its corrosion inhibition efficiency enhanced with increasing molybdate concentration.However,when the concentration of sodium molybdate exceeded 50 mg/L,the corrosion inhibition efficiency of the composite conversion film began to decrease.Various immersion duration and phytic acid concentration can exert obvious impact on the corrosion resistance of the phytic acid conversion film on B30 Cu-Ni alloy by changing its integrity and compactness.The corrosion resistance of the phytic acid conversion film can be further improved by adding molybdate to the phytic acid solution.

关 键 词：植酸 钼酸盐 转化膜 B30 铜镍合金 耐蚀性 

分 类 号：TG172.5[金属学及工艺—金属表面处理]