Analysis on Galvanic Corrosion Behavior of TA2, BAl7-7-2-2 and 921A
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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。Abstract: 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.
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Keywords:
- seawater pipelines /
- titanium /
- nickel aluminum bronze /
- galvanic corrosion
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