镧、苯并三氮唑在黄铜钝化中的作用  

Synergistic Inhibition Performance of Lanthanum Salt and Benzotriazole in Passivation of Brass

作　　者：吕雪飞[1] 李淑英[2] 

机构地区：[1]吉林化工学院机电工程学院,吉林吉林132022 [2]大连理工大学化工与环境生命部化工学院,辽宁大连116024

出　　处：《材料保护》2014年第10期45-47,8,共3页Materials Protection

摘　　要：为了进一步提高黄铜的耐蚀性,在其钝化液中加入镧盐和苯并三氮唑(BTAH)进行钝化。通过扫描电镜及X射线衍射分析了钝化膜的表面形貌、成分及结构;利用硝酸点滴及中性盐雾试验测试其耐蚀性,利用电化学极化曲线研究镧盐、BTAH单独及共同使用时对黄铜的缓蚀性能。结果表明:BTAH和镧盐具有良好的协同作用,钝化液中同时加入镧盐及BTAH所得复合钝化膜的耐硝酸点滴时间达21 s,耐中性盐雾12 h表面无明显变化;钝化液中镧盐及BTAH协同作用,使黄铜阳极腐蚀电流减小,腐蚀速度降低,使黄铜的耐蚀性能显著增强。Brass was passivated with the solution containing La salt and benzotriazole( denoted as BTAH). Thesurface morphology, composition and phase structure of as-obtainedpassivation coating were analyzed, and the corrosion resistance ofthe passivation coating was also evaluated. Moreover, the inhibitionperformance of the La salt and BTAH for brass was examined.Results indicated that BTAH and La salt exhibited good synergisticinhibition performance. Namely, when the brass was passivated inthe solution containing both La salt and BTAH, resultant passiva-tion coating was able to endure nitric acid dripping for 21 s andremained nearly unchanged after 12 h of neutral salt-spray test.Due to the synergistic inhibition effect of the La salt and BTAH, thebrass anode after the passivation treatment exhibited reducedcorrosion current and corrosion rate, showing significantly increasedcorrosion resistance.

关 键 词：黄铜 钝化 镧盐 苯并三氮唑 耐蚀性能 

分 类 号：TG174.42[金属学及工艺—金属表面处理]