在冷轧钢板表面制备二乙烯三胺五甲叉膦酸-锌化学转化膜及其腐蚀防护性能的研究  

Preparations and Corrosion Protection Investigations of Diethylene Triamine Penta(Methylene Phosphonic Acid)-Zn^(2+) Conversion Coatings on Cold Rolled Steel Substrates

作　　者：赫威 燕汝 王瑛琦 高翔 马厚义[1] HE Wei;YAN Ru;WANG Ying-qi;GAO Xiang;MA Hou-yi(School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, Shandong, China;Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, Shandong, China)

机构地区：[1]山东大学化学与化工学院,山东济南250100 [2]中国科学院海洋研究所,山东青岛266071

出　　处：《电化学》2018年第2期111-121,共11页Journal of Electrochemistry

基　　金：国家自然科学基金项目(No.21673130)资助

摘　　要：本文通过调节二乙烯三胺五甲叉膦酸酯(DTPMPA)与Zn^(2+)浓度以及溶液的pH值,将冷轧钢板浸泡于含有DTPMPA和Zn^(2+)的混合溶液中即可在基体表面形成颜色均匀且具优异腐蚀防护性能的DTPMPA-Zn^(2+)化学转化膜.使用SEM和EDS研究了DTPMPA-Zn^(2+)转化膜的表面形貌和元素组成,利用FTIR和XPS光谱方法探究了化学转化膜的表面官能团、化学组分及官能团与基底的结合方式,进而通过电化学阻抗谱(EIS)和极化曲线方法探究了DTPMPA浓度及成膜溶液p H值对化学转化膜的耐蚀性能的影响.研究发现,DTPMPA与Zn^(2+)共存时,二者发生螯合反应,并以Zn^(2+)为交联剂通过多层组装在冷轧钢基体表面形成外观为蓝色的、厚度较为均匀的DTPMPA-Zn^(2+)螯合物薄膜.当成膜溶液的pH=3.0、DTPMPA浓度为0.2%(除特别指出外,全文浓度均为质量百分数)、Zn^(2+)浓度为0.044%时,化学转化膜展现出最优异的防腐性能,对基体的腐蚀保护效率可达91.6%.Novel diethylene triamine penta（methylene phosphonic acid）（DTPMPA）-zinc ion（Zn^2＋） conversion coatings with uniform blue color and excellent corrosion protection were directly formed on the cold rolled steel（CRS） substrates by immersing a CRS plate into the film-forming solutions containing the appropriate concentrations of DTPMPA and Zn^2＋ion at the proper p H. In this paper, surface morphologies and elemental compositions of DTPMPA-Zn^（2＋）conversion coatings were characterized by SEM and EDS, respectivey. The surface function al groups, chemical constituents and binding modes to the substrates were investigated by means of FTIR and XPS methods. The influences of DTPMPA concentrations and p H values on the corrosion protection properties of the DTPMPA-Zn^2＋conversion coatings were stud ied using electrochemical impedance spectroscopy（EIS） and polarization measurements. The results revealed that DTPMPA reacted with Zn^（2＋）ions, forming the DTPMPA-Zn^（2＋）chelate under the coexistence condition of both substances. Moreover, the chelate would be deposited onto the CRS substrate through the cross-linking of Zn^（2＋）ions and form three-dimensional DTPMPA-Zn^（2＋）thin films with uniform blue color and thickness. This kind of conversion coating exhibited the best corrosion resistance performance with the protection efficiency of 91.6% when the concentrations of DTPMPA and Zn^（2＋）ion were 0.2 wt% and 0.044 wt%, respectively, in the film-forming solutions at p H = 3.0.

关 键 词：二乙烯三胺五甲叉膦酸 化学转化膜 螯合作用 腐蚀防护性能 PH 锌离子 

分 类 号：O646.6[理学—物理化学]