摘要
为了系统研究钼酸钠对ZL108铝合金微弧氧化膜性能的影响,在30 A/dm2大电流密度下改变电解液中钼酸钠的添加量,对ZL108铝合金试样进行微弧氧化,通过微弧氧化电压-时间曲线、X射线衍射仪(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)、测厚仪、硬度仪等考察钼酸钠添加量对微弧氧化电压及膜层相组成、成分、表面形貌、厚度、硬度的影响。结果表明,在大电流密度下,随着钼酸钠添加量的增加,氧化膜表面吸附物增加,起弧电压和氧化电压先升高后降低;钼酸钠的添加对陶瓷膜层相结构的影响较小,钼以MoO3形式存在于陶瓷膜层中;随着钼酸钠添加量的增加,氧化膜表面先出现孔径较大的微孔,随后微孔数量减少,孔径变小。
Micro-arc oxidation of ZL108 Al alloy was conducted at a high current density of 30 A / dm2while different amounts of Na 2 MoO 4 additive were added into the electrolyte. The micro-arc oxidation potential-time curves were measured,the phase structure,elemental composition,and morphology of as-obtained micro-arc oxidation film were analyzed by means of X-ray diffraction,X-ray photoelectron spectroscopy,and scanning electron microscopy. Moreover,a thickness gauge and a hardness meter were separately performed to measure the thickness and hardness of as-obtained micro-arc oxidation film; and the effect of Na 2 MoO 4 dosage in the electrolyte on the microstructure and hardness of the micro-arc oxidation film was explored. Results indicated that,with the increment of Na 2 MoO 4 dosage,the amount of adsorbed substances on the surface of the micro-arc oxidation film rose,and the amount and size of pores on film surface declined,accompanied by initial rise but decline later of arcing voltage and oxidation voltage therewith. In the meantime, Na2 MoO4 additive had little effect on the phase structure of micro-arc oxidation ceramic film,and Mo exists as MoO3 in the ceramic film.
出处
《材料保护》
CAS
CSCD
北大核心
2013年第10期20-22,5,共3页
Materials Protection
基金
四川省高等学校油气田材料重点实验室资助项目(12YQT026)资助
