VW63Z镁合金微弧氧化-电泳复合膜层的制备及其性能研究
Preparation and properties of microarc oxidation-electrophoretic deposition composite film on VW63Z magnesium alloy
黄文涛 1褚杰 1蔡微波 1邹文兵 1雪生兵 1梁海迪 1范剑波 1杨伟1
作者信息
- 1. 新江科技(江苏)有限公司,江苏 南通 226143
- 折叠
摘要
[目的]VW63Z稀土镁合金的耐蚀性有待提高.[方法]先在由35～40 g/L KF和2～8 g/L NaOH组成的电解液中以电压350～380 V、电流密度5.0～6.0 A/dm2、频率60～100 Hz和占空比40%～50%的条件微弧氧化10～14 min,再在立邦POWERNICS 301(ZY)GRAY型涂料中以电压80～100 V电泳3～4 min,在VW63Z镁合金表面制备了复合膜层,通过形貌观察、厚度测量、硬度检测、耐水性测试、耐酸性测试、耐碱性测试、结合力检测及中性盐雾试验对其性能进行评价.[结果]微弧氧化-电泳复合膜层结构致密,厚度高达38.6～41.8 μm,铅笔硬度至少8H,耐水性、耐酸性和耐碱性良好,附着力0 级,耐中性盐雾试验长达1632 h.[结论]微弧氧化-电泳复合工艺可有效提高VW63Z稀土镁合金的耐蚀性.
Abstract
[Introduction]The corrosion resistance of rare earth based magnesium alloy VW63Z needs to be improved.[Method]A composite film was prepared on the surface of VW63Z magnesium alloy via microarc oxidation(MAO)in an electrolyte comprising KF 35-40 g/L and NaOH 2-8 g/L at voltage 350-380 V,current density 5.0-6.0 A/dm2,frequency 60-100 Hz,and duty cycle 40%-50%for 10-15 minutes followed by electrophoretic deposition(EPD)with Nippon POWERNICS 301(ZY)GRAY paint at a voltage of 80-100 V for 3-4 minutes.The properties of the composite film were examined by morphology observation,thickness measurement,hardness test,water resistance test,acid resistance test,alkali resistance test,adhesion test,and neutral salt spray test.[Result]The microarc oxidation-electrophoretic deposition composite film is compact in structure,with a thickness as high as 38.6-41.8 μm,a pencil hardness at least 8H,0-grade adhesion,good resistance to water,acid,and alkali,and neutral salt spray resistance up to 1632 hours.[Conclusion]The combination of microarc oxidation and electrophoretic deposition can effectively improve the corrosion resistance of VW63Z magnesium alloy.
关键词
稀土镁合金/微弧氧化/电泳/硬度/结合力/耐蚀性Key words
rare earth based magnesium alloy/microarc oxidation/electrophoretic deposition/hardness/adhesion/corrosion resistance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据