铈单盐浓度对AZ91镁合金表面稀土转化膜的影响

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英文篇名：Effect of Cerium Mono-Salt Concentrations on the Rare Earth Conversion Coatings on AZ91 Magnesium Alloys 作者：周衡志 ; 王珏 ; 白允强 ; 薛亚军 英文作者：ZHOU Heng-zhi;WANG Jue;BAI Yun-qiang;XUE Ya-jun;Key Laboratory of Advanced Structural Materials and Application Technology of Jiangsu Province;Department of Material Engineering,Nanjing Institute of Technology; 关键词：稀土转化膜 ; 铈盐 ; 耐腐蚀性 ; AZ91镁合金 英文关键词：rare earth conversion coatings;;cerium salt;;corrosion resistance;;AZ91 magnesium alloy 中文刊名：CLBH 英文刊名：Materials Protection 机构：江苏省先进结构材料与应用技术重点实验室;南京工程学院材料工程学院; 出版日期：2019-05-15 出版单位：材料保护 年：2019 期：v.52;No.484 基金：南京工程学院引进人才项目(KXJ08138、KXJ08003);南京工程学院大学生科技创新基金项目(N20080205)资助 语种：中文; 页：CLBH201905014 页数：5 CN：05 ISSN：42-1215/TB 分类号：69-72+95

摘要

镁合金表面稀土转化膜应用前景广阔,但文献报道的稀土单盐浓度相差较大,为获得最佳单盐浓度,在不同铈盐浓度条件下在AZ91镁合金表面制备稀土转化膜,用扫描电镜、X射线衍射仪、浸泡腐蚀试验和电化学分析等手段和方法研究了转化膜的形貌、成分、结构和性能。结果表明:富铈稀土转化膜主要是由CeO_2、CeMg以及少量的Ce_5Mg_(41)共同构成;在成膜温度40℃、成膜时间20 min的条件下,制备镁合金稀土转化膜的最佳Ce(NO_3)_3浓度为0.02 mol/L。
        Rare earth conversion coatings on magnesium alloy present wide application prospect,but the concentrations of single rare earth salt were much different. In order to obtain the optimal concentration of single rare earth salt,the rare earth conversion coatings under the condition of different concentrations of Ce salt solution were fabricated on AZ91 magnesium alloy surface. The microstructure,chemical composition and properties of the conversion coatings were investigated by scanning electron microscope,X-ray diffractometer( XRD),immersion tests and electrochemical tests,respectively. Results showed that the Ce-rich conversion coatings were consisted of CeO_2,Ce Mg and a few Ce_5Mg_(41) phases. Under 40 ℃ of film-forming temperature and 20 min of film-forming time,the optimal concentration of Ce(NO_3)_3 for preparing conversion coating on Mg alloy was 0.02 mol/L.

引文

[1]WANG X J,XU D K,WU R Z,et al.What is going on in magnesium alloys?[J].Journal of Materials Science and Technology,2018,34(2):245-247.
    [2]GUO L,WU W,ZHOU Y F,et al.Layered double hydroxide coatings on magnesium alloys:A review[J].Journal of Materials Science&Technology,2018,34(9):1 455-1 466.
    [3]GUO L L,ZHANG J M,ZHANG Y,et al.Effect of Solution Treatment on Microstructure and Corrosion Resistance of AZ91HP Magnesium Alloy:IPO Conference Series:Materials Science and Engineering[C].IOP Publishing Ltd,2018,381:1-5.
    [4]吴丹,杨湘杰.镁合金表面化学转化处理进展[J].材料保护,2007,40(12):35-65.
    [5]吴建锋,陈东初,叶树林,等.镁合金表面稀土转化处理技术的研究进展[J].轻合金加工技术,2008,36(10):5-11.
    [6]李凌杰,雷惊雷,张胜涛,等.镁合金稀土转化膜研究进展[J].材料工程,2006,34(10):60-64.
    [7]RUDD A L,BRESLIN C B,MANSFELD F.The corrosion protection afforded by rare earth conversion coatings applied to magnesium[J].Corrosion Science,2000,42(2):275-288.
    [8]郭毅,鲁彦玲,杜仕国.镁合金表面稀土转化膜研究进展[J].表面技术,2009,38(4):63-65.
    [9]ARTHANARI S,SHIN K S.A simple one step cerium conversion coating formation on to magnesium alloy and electrochemical corrosion performance[J].Surface and Coatings Technology,2018,349(9):757-772.
    [10]CHANG M L,WU J F,CHEN D C,et al.The Composition of the Rare Earth Based Conversion Coating Formed on AZ91D Magnesium Alloy[J].Corrosion Science and Technology,2018,17(1):1-5.
    [11]钟丽应,曹发和,施彦彦,等.AZ91镁合金表面铈基稀土转化膜的制备及腐蚀电化学行为[J].金属学报,2008,44(8):979-985.
    [12]颜廷亭,谭丽丽,熊党生,等.生物医用AZ31B镁合金表面稀土转化膜的制备及其性能研究[J].稀有金属材料与工程,2009,38(4):63-65.
    [13]白丽群,钱建刚,舒康颖,等.镁合金铈化学转化工艺及性能研究[J].材料导报,2009,23(2):71-74.
    [14]许越,陈湘,李英杰,等.AZ91镁合金表面稀土转化膜的制备及耐蚀性能研究[J].中国稀土学报,2005,23(1):40-43.
    [15]董必坚.AZ91D镁合金表面La/Ce双稀土转化膜的制备及致密性研究[D].太原:太原科技大学,2016:16-17.
    [16]LEI L,WANG X,TANG Q W.Surface characterization of growth process for cerium conversion coating on magnesium alloy and its anticorrosion mechanism[J].Surface and Interface Analysis,2014,46(8):556-563.