工业纯钛TA2、镍铝青铜BAl7-7-2-2与船用钢921A电偶腐蚀行为分析  

Analysis on Galvanic Corrosion Behavior of TA2,BAl7-7-2-2 and 921A

作　　者：李志强[1] 胡靖元[1] 邱胜闻 余巍[1] LI Zhiqiang;HU Jingyuan;QIU Shengwen;YU Wei(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,河南洛阳471023

出　　处：《材料开发与应用》2018年第6期46-50,共5页Development and Application of Materials

摘　　要：分析了工业纯钛TA2、镍铝青铜BAl7-7-2-2与船用钢921A在3. 5%Na Cl溶液中的电偶腐蚀行为。TA2&921A偶对、BAl7-7-2-2&921A偶对的腐蚀电位差分别为713. 5mV、412mV,921A钢均为阳极,电偶腐蚀倾向性较大。对同一偶对,面积比为10∶1的电偶电流和阳极腐蚀速度明显高于面积比为1∶1的电偶电流和阳极腐蚀速度;相同面积比时,BAl7-7-2-2&921A偶对的电偶电流和阳极腐蚀速度高于TA2&921A偶对,BAl7-7-2-2/921A偶对和TA2/921A偶对面积比为10∶1时偶对的电偶腐蚀系数较大。TA2和BAl7-7-2-2分别与921A钢连接使用都需采取绝缘措施防护。Galvanic corrosion behaviors of titanium alloy TA2,nickel aluminum bronze alloy BAl7-7-2-2 and ship hull steel 921 A in 3. 5% Na Cl solution were investigated. The corrosion potential differences of 921A/TA2 and 921A/BAl7-7-2-2 were 713. 5mV and 412mV respectively,with 912 A as anode. For the same couple,the current and corrosion rate of the couple with area ratio of 10∶ 1 was much higher than those of the couple with area ratio of 1∶ 1. For the couple of the same area ratio,the current and corrosion rate of the couple of 921A/BAl7-7-2-2 was higher than those of the couple of 921A/TA2. The BAI7-7-2-2/921 A couple and TA2/921 couple with area ratio of 10∶1 have higher galvanic coefficients. Insulation protection should be used to connect TA2 and BAl7-7-2-2 with 912 A steel. By comparison,it is found that the corrosion potential difference of 921A/TA2 is higher,but corrosion rate and galvanic corrosion coefficient of 921A/BAl7-7-2-2 is higher than 921A/TA2.

关 键 词：海水管系 钛 镍铝青铜 电偶腐蚀 

分 类 号：TG172.5[金属学及工艺—金属表面处理]