铸造SAF2906不锈钢在人工海水中的电化学阻抗谱  

EIS characteristics of cast SAF2906 stainless steel in artificial brine solution

作　　者：向红亮[1] 黄伟林[2] 刘东[1] 何福善[1] 

机构地区：[1]福州大学机械工程及自动化学院,福建福州350108 [2]福建省电力试验研究院,福建福州350007

出　　处：《材料热处理学报》2013年第1期81-85,共5页Transactions of Materials and Heat Treatment

基　　金：科技部科技人员服务企业项目(2009GJC40018);福建省高等学校新世纪优秀人才支持计划项目(JA10014)

摘　　要：利用电化学工作站研究了铸态、固溶态、深冷态和时效态2906铸造超级双相不锈钢在人工海水中的电化学阻抗谱(EIS)特征。结果表明:不同热处理得到的2906铸造超级双相不锈钢在人工海水中呈现出相同的EIS特征,均由一个时间常数的容抗弧组成;相对铸态而言,固溶和深冷处理可降低双电层电容、提高阻抗模;而时效处理可使组织产生金属间相,导致双相不锈钢与人工海水之间的双电层电容提高,阻抗模降低7个数量级,且随时效时间的延长,两个参数的变化量越大,耐蚀性越差。The crossion behavior of cast SAF2906 super duplex stainless steel （SDSS） after solution, crygenic and aging treatment in artificial brine solution were studied by electrochemical impendance spectroscopy （EIS）. The results show that the 2906 SDSS after different heat treatments have same EIS characteristics, which exhibits a single capacitive loop. After solution treatment and cryogenic treatment, the capacitence of double layer of sample decreases and the impedance modulus increases. Aging treatment can lead to the precipitation of intermetallic phases from matrix, which causes the increase of the double layer capacitance and makes the impedance modulus of the aging specimen seven order of magnitude smaller than that of solution treated specimen. The longer aging time is, the greater the variation of the two parameters and the poorer the corrosion resistance.

关 键 词：热处理 铸造SAF2906不锈钢 电化学阻抗谱 耐蚀性 

分 类 号：TG142.71[一般工业技术—材料科学与工程]