Mg-7.3Al合金在含无机缓蚀剂的NaCl溶液中的腐蚀行为  

Corrosion Behavior of Magnesium Alloy in NaCl Solution Containing Inorganic Buffers

作　　者：贾素秋[1] 

机构地区：[1]长春工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2008年第6期484-486,共3页Special Casting & Nonferrous Alloys

基　　金：吉林省教育厅"十一五"科学技术研究项目(2007112)

摘　　要：通过浸没试验、极化曲线研究了Mg-7.3Al合金在含有NaF、Na2CO3及硼砂(Na2B4O7)3种无机缓蚀剂的(NaCl的质量分数为1%)溶液中的腐蚀行为。结果表明,Mg-7.3Al合金在含有3种缓蚀剂的NaCl溶液中的腐蚀速率随时间的延长而逐渐降低,超过48h后趋于平稳,在相同时间内腐蚀速率由小到大的顺序为Na2CO3、Na2B4O7、NaF。缓蚀剂的存在使Mg-7.3Al合金的腐蚀电位略有提高,在含Na2CO3的NaCl溶液中Mg-7.3Al合金的腐蚀电位最高。缓蚀效果由大到小的顺序是Na2CO3、Na2B4O7、NaF。Corrosion behaviors of magnesium alloy in 1% NaCl solution containing NaF or Na2CO3 or borate(1g/L,respectively)were investigated by immersion and polarization curve.The results indicate that corrosion rates of Mg-7.3Al magnesium alloy in three buffered solution are decreased with immersion time extending,which tends towards stable state after immersion for 48 hours.Degrees of corrosion rate are as follows:NaCO3 more than borate more than NaF under the same immersion time.Corrosion potential is slightly increased with the presence of buffers,in which the highest corrosion potential can be observed in 1% NaCl solution containing Na2CO3.Buffering effects follows in the order:Na2CO3 more than NaF more than borate.Na2CO3 exhibits desirable buffered effect on the Mg-7.3Al magnesium alloy.

关 键 词：Mg-7.3Al合金 无机缓蚀剂 腐蚀速率 极化曲线 

分 类 号：TG172[金属学及工艺—金属表面处理]