【摘要】 为了弄清铝合金微弧氧化重要参数对其耐点蚀和微硬度的影响 ,在氢氧化钠和硅酸钠溶液中 ,保持阳极电流密度为 15A/dm2 ,制备了阴 /阳极电流密度比在 0 .6～ 0 .8之间的铝合金微弧氧化陶瓷膜。结果表明 :阴 /阳极电流密度比对陶瓷膜的抗点腐蚀性和硬度有很强的影响 ;不同阴 /阳极电流密度比所制备的陶瓷膜微观结构差异较大 ,陶瓷膜抗点腐蚀性和硬度的不同是由这种微观结构差异所引起的更多还原

【Abstract】 Ceramic coatings were synthesized on the aluminum alloy substrate by mi- croarc oxidation (MAO) technique in aqueous solution containing sodium silicate and sodium hydroxide. The MAO coatings fabrica- ted under 15 A/dm~2 anodie current density and cathodie/anodic current density ratio between 0.6 to 0.8 were studied by X- ray diffraction ( XRD ), scanning electron microscopy ( SEM ), mi- crohardness test, and pitting corrosion test. The results show that the cathodie/anodic current density ratio has a strong effect on the microstrueture, pitting resistance and microhardness of MAO coating. The microstruetures of MAO coatings obtained under dif- ferent eathodie/anodie current density ratio are distinct, which result; in the difference of pitting resistance and hardness of ce- ramic coatings.更多还原