奥氏体-铁素体双相不锈钢晶间腐蚀试验方法  

Test Method of Intergranular Corrosion for Austenite-ferrite Duplex Stainless Steel

作　　者：罗先甫[1] 张文利[1] 翟智梁 张恒坤 查小琴[1] 刘晓勇[1] LUO Xianfu;ZHANG Wenli;ZHAI Zhiliang;ZHANG Hengkun;ZHA Xiaoqin;LIU Xiaoyong(Luoyang Ship Material Research Institute,Luoyang 471023,China)

机构地区：[1]中国船舶重工集团公司第七二五研究所,洛阳471023

出　　处：《理化检验（物理分册）》2021年第8期1-10,共10页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：国家重点研发计划项目(2016YFC0401205)。

摘　　要：奥氏体-铁素体双相不锈钢在300~1 000℃范围内会在晶界、相界及其周边区域析出σ相、χ相、R相、碳化物及氮化物等第二相,并导致晶界或析出相周边形成贫铬区,在特定环境下具有一定的晶间腐蚀敏感性,需在试验室进行准确测定。概述了奥氏体-铁素体双相不锈钢的试验室晶间腐蚀试验方法,包括化学浸泡法和电化学方法,并提出了试验中需要注意的问题,为腐蚀测试工作者提供参考。Precipitation of detrimental secondary phases such as σ, χ, R phase, chromium carbides and nitrides will inevitably occur at the grain boundary, phase boundary and its surrounding areas at 300~1 000 ℃ which leads to the formation of Cr depleted zones around grain boundary and precipitation of austenite-ferrite duplex stainless steel. This may seriously deteriorate the intergranular corrosion of the austenitic-ferrite duplex stainless steel in specific environment, so it needs to be accurately measured in the laboratory. The laboratory intergranular corrosion test methods of the austenite-ferrite duplex stainless steel were summarized, including chemical immersion method and electrochemical method. The problems needing attention in the test were put forward, which provided reference for corrosion testers.

关 键 词：奥氏体-铁素体双相不锈钢 晶间腐蚀 化学浸泡 电化学 

分 类 号：TG172[金属学及工艺—金属表面处理]