带极堆焊奥氏体不锈钢耐腐蚀性能研究  

Study of corrosion resistance of surfacing with band-electrode for austenitic stainless steel strip

作　　者：包晔峰[1] 任强[1] 姚进 张志玺[1,3] 杨可[1] 蒋永锋[1] 

机构地区：[1]河海大学,江苏常州213022 [2]中石油长城钻探钻具公司,辽宁盘锦124000 [3]常州宝菱重工机械有限公司,江苏常州213019

出　　处：《电焊机》2015年第4期32-36,共5页Electric Welding Machine

摘　　要：采用带极电渣堆焊和带极埋弧堆焊两种方法堆焊Cr-Ni不锈钢,分析这两种方法和不同焊接速度下得到的堆焊层金属的电化学腐蚀及晶间腐蚀性能。电化学试验结果表明,3.5%Na Cl溶液中,带极电渣堆焊层金属的耐点蚀性能与焊速有关,焊速为8m/h时,堆焊层金属的点蚀电位为159 m V,耐点蚀性能最佳,焊速过快或者过慢时都将降低堆焊层金属的点蚀电位,耐点蚀性能下降;相比于电渣堆焊,带极埋弧堆焊层金属的点蚀电位仅为-300 m V,耐点蚀性能较差。10%草酸电解浸蚀试验结果表明,带极电渣堆焊试样晶界处C r的含量远大于钢耐蚀所必须的量,试样腐蚀后的微观形貌也呈现"阶梯型"和"混合型",说明试样具有较好的耐晶间腐蚀性能;而带极埋弧堆焊试样晶间存在严重的贫Cr,腐蚀后试样表面的微观形貌则呈现"沟状型",耐晶间腐蚀性能较差。The electrochemical corrosion and intergranular corrosion of deposited metal obtained in surfacing the Cr-Ni stainless steel on Q235 by ESW（electroslag strip welding with band-electrode） and SAW（submerged arc welding with band-electrode） are analyzed in this paper. Electrochemical corrosion experiments show that in 3.5% Na Cl solution,the pitting potential（Epit） of deposited metal in ESW is up to 159 m V at the welding speed of 8m/h,which indicates the best pitting corrosion resistance. Too fast or too slow welding speed will rapidly decrease Epit,resulting in a decrease of the pitting corrosion resistance. The Epit of deposited metal in SAW is lower than that in ESW,is just only-300 m V,which means the pitting corrosion resistance of deposited metal in SAW is inferior to that in ESW. 10% Oxalic acid electrolytic etching test shows that the content of Cr in grain boundary of sample in ESW is far more than the necessary amount. The microstructures of samples in ESW are classified as ’step’ structure and ’dual’ structure,which indicates the best performance of anti-intergranular corrosion. However,the content of Cr in grain boundary of sample in SAW is extremely poor;resulting in the microstructures of samples in SAW to be ’ditch’,which shows the poor intergranular corrosion resistance.

关 键 词：带极电渣堆焊 堆焊层金属 晶间腐蚀 

分 类 号：TG455[金属学及工艺—焊接]