发电机内冷水的碱化研究  

Effect of pH Value of Turbo-Generator Inner Cooling Water on Corrosion of Copper Wire

作　　者：曹顺安[1] 晏敏[1] 谢学军[1] 潘玲[1] 

机构地区：[1]武汉大学动力与机械学院,湖北武汉430072

出　　处：《材料保护》2006年第9期56-58,共3页Materials Protection

摘　　要：采用直接投加碱化剂的方式来提高内冷水的pH值可达到减缓和防止发电机铜导线腐蚀的目的。通过静态挂片试验研究铜导线在不同体系和不同水质中的腐蚀情况,试验温度为50℃,挂片时间为72h。试验结果表明,在密闭性较差的体系中,即使挂片前试液的pH值高于8,挂片后试液中的铜离子含量仍可达到106.57μg/L;在密闭性较好的体系中,pH值为8时,挂片后试液中的铜离子含量为85.14μg/L;在密闭性很好的体系中,当pH值为7.16时,挂片后试液中的铜离子含量为14.45μg/L,且pH值、电导率均合格。因此当采用碱化剂调节发电机内冷水的水质,要使内冷水pH值、电导率和铜离子含量同时达到标准要求,需加强系统的密封性。It is feasible to prevent the copper wires of turbo-generator from corrosion by adding alkaline chemicals to increase the pH value of the inner cooling water. Thus the corrosion behavior of the copper wires in the cooling water of varied pH value was examined at 50 ℃ and for a corrosion duration of 72 h using static sample-hanging method. The results showed that in a poor airtight system, the solution of a pH value above 8 would have a copper ion content as much as 106.57 μg/L after the sample-hanging corrosion test. In a fair airtight system, the solution with a pH value of 8 would have a copper ion content of 85.14 μg/L after the sample-hanging corrosion test. Encouragingly, in a good airtight system, the copper ion content in the solution with a pH value of 7.2 was as low as 14.45 μg/L, while the conductivity and final pH value of the solution were acceptable. This indicates that it could be imperative to strengthen the airtightness of the turbo-generator system when using alkaline chemicals to adjust the pH value of the inner cooling water and hence to keep the pH value, conductivity, and copper ion content in the cooling water to be acceptable in engineering.

关 键 词：发电机 内冷水 PH值 铜导线 腐蚀 

分 类 号：TM301[电气工程—电机]