304不锈钢在Al-6Si-10Cu储能合金液中的腐蚀行为
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摘要
相变储能材料与容器的相容性是太阳能蓄能技术应用成功的关键因素之一。本工作选用Al-6Si-10Cu合金为储能材料、304不锈钢为容器材料,通过设计液态腐蚀试验,结合金相显微镜、XRD分析仪、电子探针等仪器,研究了304不锈钢在Al-6Si-10Cu储能合金液中的腐蚀行为和机理,并对腐蚀反应进行了动力学分析。结果表明:腐蚀层分内、外两层;内腐蚀层主要由Al_(95)Fe_4Cr相组成,呈条带状,较致密且显微硬度高于外腐蚀层;外腐蚀层比较疏松,主要由Fe_xSi_yAl_z相和FeAl相组成;随时间的延长,因Al_(95)Fe_4Cr、Fe_xSi_yAl_z等金属间化合物对元素扩散的阻挡作用,腐蚀速率先减小后趋于平缓,而腐蚀层厚度和腐蚀失重一直增加,并趋于稳定;腐蚀产物生长指数n为0.673,腐蚀类型为扩散腐蚀。
The compatibility of phase change energy storage materials with containers is one of the key factors for the successful application of solar energy storage technology. In this work, Al-6 Si-10 Cu alloy was chosen as the heat storage material, the 304 stainless steel as the container material. By designing a liquid corrosion test, the corrosion behavior and mechanism of 304 stainless steel in Al-6 Si-10 Cu energy storage alloy li-quid were investigated with the aid of metallographic microscope,electron probe and XRD analyzer ect. What's more, the kinetic analysis of corrosion reaction was also carried out. The results showed that the corrosion layer consists of a inside layer and a outside layer. The inner corrosion layer is mainly composed of Al_(95)Fe_4Cr phase,banded and denser. And its microhardness is bigger than the outer layer's. The outer corrosion la-yer is loose and is mainly composed of Fe_xSi_yAl_zphase and FeAl phase. Due to the blocking effects of intermetallic compounds such as Al_(95)-Fe_4Cr and Fe_xSi_yAl_z on the diffusion of elements, the corrosion rate decreases first and then tends to slow down with the erosion time increasing. The thickness of corrosion layer and the corrosion weight loss increase gradually with the increase of the time,and then tend to be stable. The corrosion product's growth index n is 0.673, indicating that the corrosion type is diffusion corrosion.
The compatibility of phase change energy storage materials with containers is one of the key factors for the successful application of solar energy storage technology. In this work, Al-6 Si-10 Cu alloy was chosen as the heat storage material, the 304 stainless steel as the container material. By designing a liquid corrosion test, the corrosion behavior and mechanism of 304 stainless steel in Al-6 Si-10 Cu energy storage alloy li-quid were investigated with the aid of metallographic microscope,electron probe and XRD analyzer ect. What's more, the kinetic analysis of corrosion reaction was also carried out. The results showed that the corrosion layer consists of a inside layer and a outside layer. The inner corrosion layer is mainly composed of Al_(95)Fe_4Cr phase,banded and denser. And its microhardness is bigger than the outer layer's. The outer corrosion la-yer is loose and is mainly composed of Fe_xSi_yAl_zphase and FeAl phase. Due to the blocking effects of intermetallic compounds such as Al_(95)-Fe_4Cr and Fe_xSi_yAl_z on the diffusion of elements, the corrosion rate decreases first and then tends to slow down with the erosion time increasing. The thickness of corrosion layer and the corrosion weight loss increase gradually with the increase of the time,and then tend to be stable. The corrosion product's growth index n is 0.673, indicating that the corrosion type is diffusion corrosion.
引文
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4 Zou X.Corrosion and Protection,1995,16(5),214(in Chinese).邹向.腐蚀与防护,1995,16(5),214.
5 Li X H,Li G X,Wu Y,et al.Hot dip plating and seepage plating of steel parts,Chemical Industry Press,China,2009 (in Chinese).李新华,李国喜,吴勇,等.钢铁制件热浸镀与渗镀,化学工业出版社,2009.
6 Liu J,Wang X,Zeng D B,et al.Acta Energiae Solaris Sinica,2006,27(1),36 (in Chinese).刘靖,王馨,曾大本,等.太阳能学报,2006,27(1),36.
7 Chen X,Zhang R Y,Li F.Materials Review B:Research Papers,2011,25(9),78(in Chinese).陈枭,张仁元,李风.材料导报:研究篇,2011,25(9),78.
8 Shen X Z.Study on heat storage cycle stability of aluminum silicon two eutectic alloy and its surface treatment.Master’s Thesis,Guangdong University of Technology,China,2007 (in Chinese).沈学忠.铝硅二元共晶合金储热循环稳定性及其对容器的表面处理研究.硕士学位论文,广东工业大学,2007.
9 Zhang R Y,Sun J Q,Lu G H.Materials for Mechanical Engineering,2006(7),11(in Chinese).张仁元,孙建强,卢国辉.机械工程材料,2006(7),11.
10 Wei B M.Theory and application of metal corrosion,Chemical Industry Press,China,1997 (in Chinese).魏宝明.金属腐蚀理论及应用, 化学工业出版社,1997.
11 M Vedat Akdeniz,Amdulla O Mekhrabov,Turgay Yilmaz.Scripta Metallurgica et Materialia,1994,31(12),1723.
12 Gu G C,Liu B J.Hot dipping,Chemical Industry Press,China,1988 (in Chinese).顾国成,刘邦津.热浸镀,化学工业出版社,1988.
13 Han S L,Li H L,Wang S M,et al.Metallic Functional Materials,2010,1(17),34 (in Chinese).韩石磊,李华玲,王树茂,等.金属功能材料,2010,1(17),34.
14 Guo J T,Sun C,Tan M H,et al.Acta Metallurgica Sinica,1990(1),20 (in Chinese).郭建亭,孙超,谭明晖,等.金属学报,1990(1),20.
15 Tong C,Su X P,Li Z,et al.Journal of Materials Engineering,2013 (7),54 (in Chinese).童晨,苏旭平,李智,等.材料工程,2013(7),54.
16 Li Z.Research on the silicon reactivity and the influence of alloy elements on the hot-dip galvanizing.Master’s Thesis,Central South University,Chian,2008 (in Chinese).李智.硅反应性及合金元素对热浸镀锌影响的研究.硕士学位论文,中南大学,2008.
17 Peng B C.The influence of the temperature and time on the galvanized coating.Master’s Thesis,Xiangtan University,Chian,2007 (in Chinese).彭碧草.浸镀温度和浸镀时间对热浸镀锌镀层组织的影响.硕士学位论文,湘潭大学,2007.