304不锈钢在Al-6Si-10Cu储能合金液中的腐蚀行为  

Corrosion Behavior of 304 Stainless Steel in Al-6Si-10Cu Energy Storage Alloy Solution

作　　者：张潇华[1] 于思荣[2] 谭哲[1] 郭丽娟[1] 刘旭 ZHANG Xiaohua;YU Sirong;TAN Zhe;GUO Lijuan;LIU Xu(Department of Mechanical and Control Engineering,Shengli College China University of Petroleum,Dongying 257061;College of Mechanical and Electronic Engineering,China University of Petroleum,Qingdao 266580)

机构地区：[1]中国石油大学胜利学院机械与控制工程学院,东营257061 [2]中国石油大学(华东)机电工程学院,青岛266580

出　　处：《材料导报》2019年第10期1681-1684,共4页Materials Reports

基　　金：教育部中央高校基本科研业务费专项资金(11CX05003A);国家级大学生创新训练项目(201713386029)~~

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-6Si-10Cu 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-6Si-10Cu 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 x Si y Al z phase and FeAl phase.Due to the blocking effects of intermetallic compounds such as Al 95-Fe 4Cr and Fe x Si y Al 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.

关 键 词：AL-SI-CU合金 相变储能 304不锈钢 腐蚀 

分 类 号：TG178[金属学及工艺—金属表面处理]