植酸对镁合金微弧氧化膜性能影响  

Effects of phytic acid on properties of micro arc coatings formed on magnesium alloys

作　　者：张荣发[1] 王方圆[2] 娄瑾[1] 白凌云[1] 张淑娟[1] 周泽华[1] 杨干兰[1] 刘庭芝[1] 张淑芳[1] 

机构地区：[1]江西科技师范学院江西省材料表面工程重点实验室,江西南昌330013 [2]浙江金华职业技术学院,浙江金华321007

出　　处：《功能材料》2007年第A10期3762-3764,共3页Journal of Functional Materials

摘　　要：在18g／L的碱性硅酸钠溶液中，加入7．5gm的环保无毒植酸，研究它对镁合金氧化膜表面形貌、成分、颜色、厚度以及耐蚀性影响。加入植酸后，氧化膜孔的直径范围由1～5μm增加到1～8μm，但氧化膜表面单位面积孔的个数由0.05个／μm^2减少到0．02个／μm^2。植酸参与氧化膜的形成过程，并使氧化膜颜色随着植酸加入量的增加逐渐加深。植酸使氧化膜的厚度由11gm增加到16μm。浸泡实验表明，植酸可进一步提高氧化膜耐蚀性，产生第一个腐蚀点时间由24h延长到50h。In an alkaline solution containing 18 g/L sodium silicate, 7.5 g/L phytic acid, which is harmless and environmentally friendly, was added to study its effects on surface morphology, chemical compositions, colour, thickness and corrosion resistance of anodic coatings formed on magnesium alloys. After addition of phytic acid, the range of pore diameter increased from 1～5μm to 1 ～8μm, but the number of pores per area on coating surface decreased from 0.05 to 0.02 per μm^2. The phytic acid took part in the coating formation and the coating color became dark with the increase of phytic acid concentration. The phytic acid increased the coating thickness from 11μm to 16μm. The immersion test showed that the phytic acid could further improve the corrosion resistance of anodic coatings and the time when the first corrosion pit was developed prolonged from 24h to 50h.

关 键 词：镁合金 氧化膜 电解质 植酸 

分 类 号：TG174[金属学及工艺—金属表面处理]