摘要
选用200目和400目两种细度的镁粉分别配制了不同的涂层样品,金相显微镜观察表明,良好的分散要求下,200目镁粉可添加至47%(质量分数,后同),而400目镁粉可添加至50%以上;阻抗谱测试结果表明,环氧–富镁底漆对铝合金基体不提供长效屏蔽保护作用,且无钝化膜产生。极化曲线测试结果进一步表明,富镁底漆对铝合金基材的保护来自于抑制阳极反应的阴极保护机制,最佳保护效果下镁粉用量为:200目45%~47%,400目48%~50%;涂层分别涂覆在2024-T3和7075-T6两种型号铝合金基材表面,防护效果对比表明,富镁底漆对铝合金具有通用保护效果。
Using Mg powder with size of 200 mesh&400 mesh to prepare different coatings samples,observation by metallographic microscope showed:keeping good dispersion effect,200 mesh Mg powder can be added to 47%(wt.%,the same below),and 400 mesh Mg powder can be added to more than 50%;test of impedance spectrum indicated:Epoxy-Mg-rich primer could not provide long-term shielding protection for Al alloy,and no passivation film was produced.Further,polarization curve testing showed the protection mechanism of Mg-rich primer for Al alloy came from inhibiting anode reaction to result in cathodic protection,the optimum dosage of Mg powder to provide good protection effect being:45%~47%for 200 mesh Mg powder and 48%~50%for 400 mesh Mg powder;comparison of corrosion protection effect of the same Mg-rich primer for 2024-T3 and 7075-T6 showed the universal protection for different Al alloys.
作者
戈成岳
马秀敏
段继周
侯保荣
GE Cheng-yue;MA Xiu-min;DUAN Ji-zhou;HOU Bao-rong(Key Laboratory of Advanced Marine Materials,Qingdao 266071,Shandong,China;Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,Shandong,China)
出处
《中国涂料》
2024年第12期62-68,共7页
China Coatings
关键词
富镁底漆
阴极保护
铝合金
交流阻抗
极化曲线
Mg-rich primer
cathodic protection
Al alloy
AC impedance
polarization curve
