材料期刊网

以0．5mol／L硫酸为电解液，利用离子液体电镀技术与阳极氧化相结合的方法在304不锈钢表面成功制备了含纳米级微孔的Al镀层。利用扫描电镜（SEM）、X射线能谱（EDs）和X射线衍射（XRD）对氧化铝模板及铝镀层阳极氧化后的组织进行形貌观察和晶相结构分析。结果表明，加入体积分数1．25％的甲苯，温度为55℃，电流密度为20-25mA／cm2时，所得到的铝镀层平整致密，且随电流密度的增大，镀层铝晶粒尺寸越来越细小。不锈钢表面铝镀层经不同时间阳极氧化处理后，镀层上出现了纳米级孔洞。XRD结果表明，镀层上除了出现了铝相外，还出现了非晶态Al2O3相。随氧化时间的延长，非晶态Al2O3相增多，Al相减少，氧化膜厚度增加，表面孔洞尺寸增大。

Aluminum film containing nano-porous was prepared on 304 stainless steel surface by combining electroplating from ionic liquids and anodizing in 0. 5 mol/L sulfuric acid solution. The microstructure and morphology of electroplating aluminum coating on stainless steel were investigated by means of SEM, EDS and XRD, The results showed that a compact and well adherent aluminum coating was obtained under the conditions of 55 ℃, current density of 20-25 mA/cm2 and addition of toluene for volume fraction of 1. 25%. The results showed that with the increase of the current density, the size of aluminum grains decreased. After anodic oxidation of the electroplating aluminum coat for different times, the surface of the coating exhibited nanometer micro pores. XRD results showed that the coating was composed of A1 and amorphous Al2O3. With the extension of anodic oxidation time, the content of A1 decreased, the content of amorphous Al2O3 increased, the thickness of oxidation film and the diameter of pores observed on the stainless steel surface also increased.