时效处理对Mg-15Y合金腐蚀性能的影响  

Effect of Aging Treatment on Corrosion Behavior of Mg-15Y Alloy

作　　者：邓霞[1,2,3] 张奎[3] 张新[3,4] 刘长华[4] 王长顺[4] 胡锦川[5] 黄辉[5] 李志强[4] 

机构地区：[1]北京矿冶研究总院 [2]北京市工业部件表面强化与修复工程技术研究中心 [3]北京有色金属研究总院有色金属材料制备加工国家重点实验室 [4]北京北方车辆集团有限公司工艺技术中心 [5]中国人民解放军驻六一八厂军事代表室

出　　处：《特种铸造及有色合金》2014年第8期882-886,共5页Special Casting & Nonferrous Alloys

基　　金：国家十二五科技支撑计划资助项目(2011BAE22B01)

摘　　要：研究了不同时效温度和时间对Mg-15Y合金在3.5%的NaC1溶液中的腐蚀行为的影响,并分析了合金的腐蚀机理。结果表明,225℃时效处理时的峰时效时间为12h,硬度值达到最大,随着时间的延长,硬度值开始下降,并在110℃左右时趋于平缓;随着浸泡时间延长,腐蚀深度和析氢量持续增加;在浸泡时间一定时,合金的腐蚀程度随时效时间的延长先增加后减小,析氢速率先增大后减小,电势电位与腐蚀电流先减小后增大;在同一时效温度下随着时效时间的延长,腐蚀宏观形貌上没有很大的变化,随着时效时间的延长,析氢量先减小后增加。The corrosion behavior of Mg-15Y magnesium alloy after aging at different temperature and time in 3.5 % NaCI solution was investigated, and corrosion mechanism of the alloy was described. The results show that the peak aging time of Mg-15Y is 12 h at 225 ℃, where the hardness of the alloy reaches the maximum values. And then with increasing in aging time, the hardness of the alloy is decreased to approximately 110. The corrosion depth and the hydrogen evolution are gradually increased with increasing in soaking time. At a fixed soaking time, the corrosion degree and the hydrogen evolution rate are increased firstly and then decreased with increasing in soaking time, while the corrosion potential and corrosion current of the alloy are decreased firstly and then increased. At the same temperature, corrosion morphology change can be neglected with postponing aging time, however, hydrogen evolution rate is decreased firstly and then increased.

关 键 词：时效 Mg-15Y 腐蚀 

分 类 号：TG166.4[金属学及工艺—热处理] TG146.22[金属学及工艺—金属学]