成膜温度对转化膜性能的影响  

Influence of treating temperature on preparation and performance of conversion films

作　　者：桑延霞[1] 唐鹏[2] 张军军[1] 

机构地区：[1]广东药学院医药化工学院,广东中山528458 [2]广西大学材料科学与工程学院,广西南宁530004

出　　处：《材料热处理学报》2013年第11期188-194,共7页Transactions of Materials and Heat Treatment

基　　金：粤港关键领域重点突破项目(2008Z 012);广东省重大科技专项(产业共性技术)基金(2009A08025002);广东药学院2012年学生课外科研立项资助项目(109)

摘　　要：为了研究温度对Ce—Mn转化膜微观组织结构与性能的影响，应用正交实验研究了3rain成膜时温度、pH值和转化处理液配方对转化膜性能的影响，采用电化学测试技术与材料分析方法测试了温度对转化膜形成、物相、形貌及耐蚀性能的影响。结果表明，获得温度35℃、pH2．0、Ce（NO3），7g/L、KMnO40．5g／L和NaF0．06g／L的较佳成膜工艺，温度是最重要的影响因素。在25～40℃范围内，随温度升高，转化膜腐蚀电位、膜层电阻，表面耐蚀性、膜层硬度和厚度均出现先升高后降低，在35℃附近出现极大值，转化膜表面致密性和均匀性较好，主要由Ce、Mn和A1组成。综合考虑转化膜的组织和性能，在本研究范围内，成膜适宜温度为35℃。In order to study the effect of treating temperature on preparation and properties of Ce-Mn conversion coating, the process parameters such as the formulation of the bath solution, temperature and pH value of the coating formation,were optimized by orthogonal tests. Electrochemical methods, optical microscope and SEM were used to analyze the morphology and properties of the films. The results show that optimum parameters are as follows： the temperature of the film formation is 35 ℃ , pH value of the bath is 2.0, and the formulation of Ce（ NO3） 3 of 7 g/L, KMnO4 of 0.5 g/L and NaF of 0.06 g/L is recommended, in which, the temperature is a critical factor for the film formation. The corrosion potential, conversion coating resistance and surface micro-hardness of the film and its thickness firstly increase and then decrease with the increase of the temperature from 25 ℃ to 40 ℃ and present the maximmn values at about 35 ℃. Compact and homogeneous conversion coatings are obtained when the temperature is 35 ℃ , conversion coatings mainly consist of AI, Mn and Ce elements.

关 键 词：转化膜 正交实验 成膜温度 性能 

分 类 号：TG174.45[金属学及工艺—金属表面处理]