退火工艺对Cu-30Ni合金管耐海水腐蚀性能的影响  

EFFECT OF ANNEALING PROCESS ON CORROSION RESISTNCE OF Cu-30Ni ALLOY TUBE IN SEAWATER

作　　者：毛向阳[1] 方峰[1] 谈荣生[1] 蒋建清[1] 

机构地区：[1]东南大学材料科学与工程学院,南京211189

出　　处：《腐蚀科学与防护技术》2009年第5期460-463,共4页Corrosion Science and Protection Technology

基　　金：国家重点基础研究发展(973)计划资助项目(2007CB616903)

摘　　要：通过电化学测试方法研究了不同参数退火后Cu-30Ni合金管在静止人工海水中的腐蚀行为.结果表明,海水腐蚀初期,富Ni表面膜对Cu-30Ni合金管耐海水腐蚀性能的影响起主要作用,其相对于基体成为阳极性保护,且随着退火温度升高,保温时间延长,Cu-30Ni合金管抗蚀能力越好;随着海水浸泡时间的延长,退火后Cu-30Ni合金管的显微组织结构对海水腐蚀性能影响占优,细小的富Ni颗粒成为微电池的阳极,优先被腐蚀;720℃×30 min热处理后试样抗腐蚀性能较好,腐蚀40天后,没有发现点蚀坑.The corrosion behavior of annealed Cu-30Ni alloy tube in static artificial seawater was studied by electrochemical measurement. The results showed that Ni element was enriched in the original surface film of Cu-30Ni alloy tube after annealing. The Ni-rich original surface had important effect on corrosion resistance of Cu-30Ni alloy tube during short period exposure in seawater because it acted as anode and protected the matrix. The corrosion resistance of Cu-30Ni alloy was better when annealing temperature was higher and the annealing period was longer. The corrosion behavior of Cu-30Ni alloy tube during long period exposure in seawater was determined by the microstrueture formed during the annealing. The fine Ni-rich grains acted as anode in the micro-cell and were firstly corroded. It was found that the Cu-30Ni alloy tube annealed at 720℃ for 30 rain exhibited favorable seawater corrosion resistance.

关 键 词：Cu-30Ni合金管 退火 初始表面膜 细小富Ni颗粒 耐海水腐蚀性 

分 类 号：TG172.5[金属学及工艺—金属表面处理]