摘要
材料的轻量化已经越来越成为一种趋势。镁合金因为更高的比强而作为铝合金的替代材料,在机械、电子和航空等工业有着广泛的应用前景。然而镁合金因硬度低,抗腐蚀性差而使应用受限制,因此需要进行表面处理以提高材料的使用寿命和拓宽应用领域。采用High-Velocity-Air-Fuel(高速火焰喷涂)技术在AZ31镁合金基体上制备了WC-CoCr涂层,采用XRD、SEM分别对涂层的相和显微结构进行了分析,同时研究了拉伸对偶件的弹性模量对涂层结合强度测试的影响,重点阐述了涂层的结合机理。此外,还研究了镁基高速火焰喷涂WC涂层的抗中性盐雾腐蚀性能。结果表明,采用HVAF技术,可在AZ31镁合金基体上获得致密,结合强度较高且具有良好抗腐蚀性能的WC-CoCr涂层。
Lightweight in materials is emerging as a trend in industry. Magnesium alloy is considered as a candidate to aluminum alloy due to higher specific strength and has found applications in a wide range of industries such as mechanical, electronic and aeronautic industries, etc. However, comparatively low hardness and activity of magnesium alloy leads to bad wear and corrosion resistance, therefore surface treatment is required to enhance its abradability and corrosion resistance so as to extend its service life and application field. In the experiment, High- Velocity- Air- Fuel （HVAF） WC - CoCr coating on AZ31 magnesium alloy substrate was prepared. The phase and microstructure for the coating was investigated, and the bonding mechanism was extrapolated in detail. In addition, the influences of elastic modulus of parts on the characterizations of bond strength for coatings were also analyzed. The corrosion resistance for bare and coated AZ31 magnesium is also investigated. The result showed that the dense WC - CoCr coating with high bonding strength can be manufactured on the substrate of AZ31 magnesium alloy by HVAF process.
出处
《轻金属》
CSCD
北大核心
2008年第2期48-52,共5页
Light Metals
