海水泵叶轮316L不锈钢螺钉的腐蚀原因分析  

Cause Analysis on Corrosion of 316L Stainless Steel Bolts of Seawater Pump Impeller

作　　者：关锰[1] 王冬颖[1] 程从前[2] 李倩[2] 赵杰[2] 

机构地区：[1]沈阳鼓风机集团核电泵业有限公司,沈阳110869 [2]大连理工大学材料科学与工程学院,大连116023

出　　处：《理化检验（物理分册）》2015年第11期806-809,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：国家自然科学基金资助项目(51171051;51101024;51171037);国家自然科学基金委-神华集团"煤炭联合基金"资助项目(51134013)

摘　　要：针对海水泵叶轮316L不锈钢螺钉的腐蚀现象,综合运用宏观检验、金相检验、化学成分分析、扫描电镜与能谱分析,以及动电位极化分析方法对螺钉的腐蚀原因进行了分析。结果表明:腐蚀螺钉的化学成分不符合316L不锈钢的标准要求,且高脉冲电流电火花加工的变质层中存在微裂纹,该变质层的局部残留进一步降低了螺钉的耐蚀性,最后对提高螺钉耐蚀性提出了相应建议。Aiming to the corrosion phenomenon of 316 Lstainless steel bolt of seawater pump impeller,the cause of bolts corrosion was analyzed through macroscopic and metallographic inspection,chemical composition analysis,scanning electron microscopy and energy spectrum analysis,and potentiodynamic polarization analysis.The results show that the chemical composition of the corroded bolts didn＇t meet the standard requirement,and microcracks existed in the metamorphic layer after sparkle drilling under high pulse current.The existence of residual metamorphic layer further degraded the corrosion resistance.Finally the corresponding suggestion was recommended to enhance the bolts corrosion resistance.

关 键 词：海水泵 316L不锈钢 腐蚀 电火花 电偶 

分 类 号：TG142.15[一般工业技术—材料科学与工程] TG178[金属学及工艺—金属材料]