摘要
为了有效提高AZ31镁合金在3.5%(质量分数,下同)NaCl溶液中的耐蚀性,研究了CeO_(2)浓度及超声辅助和无超声辅助工艺对AZ31镁合金在混合镀液(0.300 mol/L Na_(2)MoO_(4)+0.120 mol/L NaF+0.050 mol/L Na_(3)PO_(4)+0.075 mol/L K_(2)FeO_(4))中制备的化学转化膜的影响,以及该化学转化膜对AZ31镁合金耐蚀性的影响。实验结果显示:在超声辅助工艺下,加入0.050 mol/L CeO_(2)于混合镀液中进行镀膜后,镁合金的腐蚀电位明显正向移动,腐蚀电流密度显著降低;在3.5%NaCl溶液中浸泡96 h之后,其表面仍比较光滑,没有观察到明显的裂纹,镁合金基体得到了有效保护。
Aiming at improving the corrosion resistance of AZ31 magnesium alloy in 3.5%(mass fraction)NaCl solution,the effects of CeO_(2)concentration and ultrasonic and non-ultrasonic assisted processes on chemical conversion film of AZ31 magnesium alloy prepared in the mixed bath of 0.300 mol/L Na_(2)MoO_(4)+0.120 mol/L NaF+0.050 mol/L Na_(3)PO_(4)+0.075 mol/L K_(2)FeO_(4)were studied.In addition,the influence of the chemical conversion film on the corrosion resistance of AZ31 magnesium alloy was also studied.Results showed that in the case of ultrasonic assisted process,when the coating was prepared with an addition of 0.050 mol/L CeO_(2)in the mixed bath,the corrosion potential of magnesium alloy shifted to be more positive and the corrosion current density decreased significantly.After 96 h immersion in 3.5%NaCl solution,the surface of magnesium alloy was still relatively smooth without obvious cracks,indicating that the magnesium alloy substrate was effectively protected.
作者
肖飞燕
冉潇潇
刘静
向庆
杨峰
XIAO Fei-yan;RAN Xiao-xiao;LIU Jing;XIANG Qing;YANG Feng(School of Materials and Architectural Engineering,Guizhou Normal University,Guiyang 550025,China)
出处
《材料保护》
CAS
CSCD
2022年第6期92-97,181,共7页
Materials Protection
基金
黔科合基础([2020]1Z041)
贵州师范大学大科项目(DK2020A064)资助。
作者简介
通信作者:杨峰(1985-),硕士,副教授,主要研究方向为金属腐蚀,电话:18585833286,E-mail:474820562@qq.com。
