采用电化学阻抗、动电位极化、开路电位监测和X射线光电子能谱（XPS）等手段,研究了环氧涂层中锌铬黄颜料对镁合金的腐蚀防护作用,并分析了其防蚀机理。结果表明,锌铬黄防锈颜料均匀分散在涂层中,增强了涂层的屏蔽性能以及涂层与镁合金基体的结合力;在3%NaCl水溶液中,锌铬黄是一种阳极型缓蚀剂,它依靠铬酸根离子的阳极钝化作用形成钝化膜,阻滞了阳极腐蚀过程,造成涂层试样开路电位正移,使涂层试样的阳极极化增大。
By means of electrochemical impedance spectroscopy（EIS）,dynamic potential polarization,open circuit potential monitoring and XPS,the corrosion protection mechanism of zinc chromate in epoxy coatings for magnesium alloys was studied.The experimental results showed that zinc chromate antirust pigment could be uniformly dispersed in the coatings and improved the shielding effect of the coatings as well as the adhesion force between coating and magnesium substrate.In 3%NaCl solution,zinc chromate was an anodic type corrosion inhibitor.On the surface of the magnesium alloy,passive film was formed by anodic passivation effects of the chromate ions,and thus inhibited the anodic corrosion process and resulted in a positive shift of corrosion potential and an euhacement of anodic polarization of the coated sample.
参考文献
| [1] | 金广泉,曹跃云.纳米TiO2复合铁钛防锈颜料的研制及产业化进展[J].现代涂料与涂装,2006(04):37-41. |
| [2] | Bierwagen G;Allahar K;Hinderliter B;Simoes AMR;Tallman D;Croll S .Ionic liquid enhanced electrochemical characterization of organic coatings[J].Progress in Organic Coatings: An International Review Journal,2008(3):250-259. |
| [3] | Yao HB.;Wee ATS.;Li Y. .An XPS investigation of the oxidation/corrosion of melt-spun Mg[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2000(1/2):112-119. |
| [4] | Chong KZ.;Shih TS. .Conversion-coating treatment for magnesium alloys by a permanganate-phosphate solution[J].Materials Chemistry and Physics,2003(1):191-200. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%