晶粒尺寸对316LN不锈钢晶间腐蚀敏感性的影响  

Effect of Grain Size on Susceptibility to Intergranular Corrosion of 316LN Stainless Steel

作　　者：彭新元[1,2] 周贤良[1,2] 华小珍[2] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京211106 [2]南昌航空大学江西省金属材料微结构调控重点实验室,南昌330063

出　　处：《中国腐蚀与防护学报》2016年第1期25-30,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家高技术研究发展计划项目(2012AA03A507);江西省教育厅科技项目(GJJ14534);江西省金属材料微结构调控重点实验室开放基金项目(JW201223001);江苏高校优势学科建设工程资助项目(PAPD)资助

摘　　要：通过动电位再活化法,微观形貌观察以及表面相对电子功函数研究了晶粒尺寸对316LN不锈钢晶间腐蚀敏感性的影响。不同晶粒尺寸试样通过改变固溶时间来获得。结果表明:经相同敏化处理后,316LN不锈钢的晶间腐蚀敏感程度随着晶粒尺寸的增加而降低。细晶粒试样晶界有腐蚀沟,并连成网状,且晶界明显粗化,而粗晶粒试样无明显腐蚀。表面相对电子功函数数据表明,相对于细晶粒试样,粗晶粒试样表面电子结构分布更稳定。The effect of grain size on the susceptibility to intergranular corrosion of 316LN stain- less steel was investigated by means of electrochemical potentiokinetic reactivation test and electronic work function measurement, as well as microstructure characterization. Steel samples of various grain sizes were produced by heat treating the steel at 1100 ℃ for different duration. The result showed that the degree of sensitization decreases with increasing grain size; corrosion pits oc- cur at grain boundaries and thereby form a network-like pits-chain for samples of fine grains. In the contrast, no obvious corrosion occurred on samples of coarse grain. The results of electronic work function measurement imply that the surface electronic density of states and charge density distribu- tions for steel of coarse grains are much stable than that of fine grains.

关 键 词：动电位再活化法 晶粒尺寸 晶间腐蚀 

分 类 号：TG174.3[金属学及工艺—金属表面处理]