摘要
为了改变磷酸盐转化液造成的废水富营养化,将偏钒酸铵和氟硅酸盐组成转化液,在AZ31B镁合金表面制备了无铬转化膜,确定了最佳转化液组成及工艺条件。采用扫描电镜和能谱仪分析了转化膜的微观形貌和元素组成,通过极化曲线和中性盐雾试验研究了转化膜的耐蚀性。结果表明:转化膜由Mg,O,F,Si,V元素组成;转化膜耐蚀性较好,中性盐雾试验超过24 h。
For the purpose of getting rid of eutrofication of wastewater caused by P in phosphate conversion fluids, ammonium metavanadate and fluorosilicate were used to formulate conversion solution and prepare Cr-free conversion coating on the surface of AZ31B Mg alloy. The optimal composition of the conversion fluid and desired conditions for preparing the conversion coating were established. The microstructure and composition of as-obtained conversion coating were analyzed by means of scanning electron microscopy and energy dispersive spectrometry, while its corrosion resistance was evaluated based on measurement of the polarization curve and neutral salt-spray test as well. Results show that as-obtained conversion coating consists of elements Mg, O, F, Si, and V and possesses good corrosion resistance, showing a neutral salt-spray endurance of more than 24 h.
出处
《材料保护》
CAS
CSCD
北大核心
2012年第7期31-33,74-75,共3页
Materials Protection
基金
国家自然科学基金项目(20976143)
教育部高等学校博士学科重点专项科研基金(20096120110007)
关键词
无铬转化膜
偏钒酸铵
氟硅酸盐
镁合金
耐蚀性
chromate-free conversion coating
ammonium metavanadate
fluorosilicate
magnesium alloy
corrosion resistance
