摘要
为了研究三乙醇胺在氯化钠溶液中对镁合金的缓蚀效果,运用电化学工作站和扫描电子显微镜测试分析了镁合金在含三乙醇胺的氯化钠溶液中的微分电容曲线、表面覆盖度、循环极化曲线、电化学阻抗谱和表面微观形貌。结果表明:在氯化钠溶液中添加3 m L/L三乙醇胺时,镁合金与溶液界面的微分电容值减小,微分电容曲线出现电位平台,零电荷电位正移;随着阳极极化加强,三乙醇胺在镁合金表面覆盖度下降,产生阳极脱附现象;随着浸泡时间延长,镁合金表面出现裂缝,并逐渐发展为腐蚀孔,腐蚀产物分布在蚀孔周边,且易脱落。
In order to study the inhibition effect of triethanolamine （TEA） for magnesium alloy in NaCl solution, the differential capacitance curves, surface coverage, cyclic polarization curves, electrochemical impedance spectroscopy and surface morphology of magnesium alloy in 3.5 % NaCl solution were studied by electrochemical workstation and scanning electron microscopy. Results showed that adding 3 mL/L TEA in NaCl solution, the differential capacitance between magnesium alloy and solution interface decreased, and differential capacitance curve had potential platform, as well as Zero charge potential shifted positive. With the anodic polarization strengthened, surface coverage of TEA on magnesium alloy decreased, producing anodic desorption phenomenon. Furthermore, with the soaking time of magnesium alloy in NaCl solution extensing, the magnesium alloy surface cracked and gradually developed into corrosion holes, which caused that corrosion products distributed around the pits, and easily fell off.
出处
《材料保护》
CSCD
北大核心
2017年第11期39-43,共5页
Materials Protection
基金
国家自然科学基金项目(51664011
51665010)
广西自然科学基金项目(2014GXNSFAA118335)
广西中青年教师基础能力提升项目(KY2015LX110)资助
关键词
镁合金
三乙醇胺
缓蚀效果
吸附行为
magnesium alloy
triethanolamine
corrosion inhibition effect
adsorption behavior
