摘要
利用电化学方法研究了AZ91D镁合金表面植酸转化膜耐蚀性能;借助SEM、EDAX和FTIR等方法分析了转化膜的形貌、成分和官能团构成等,并对成膜机理进行了研究.结果表明,最佳成模工艺为:植酸处理浓度5g/L,成膜温度20℃,成膜时间15min,pH值为8,该条件下获得的植酸转化膜无碎裂现象,覆盖度高,表面富含羟基与磷酸基,膜层主要由Mg、Al、O、P和C等元素组成;植酸转化膜可以明显提高AZ91D镁合金的耐蚀性能,自腐蚀电流降低约6个数量级.
The corrosion resistance of phytic acid conversion coatings on AZ91D magnesium alloy surface was studied by electrochemical methods. Morphology, composition and functional group of coatings were investigated by SEM, EDAX and FTIR, respectively. The formation mechanism of phytic acid conversion coatings was also discussed. Results show that the corrosion resistance of AZgl D magnesium alloy is improved by phytic acid coatings evidently. The conversion coatings formed under optimal processing parameters are found of high coverage and no cracks. The main elements of the conversion coatings are Mg, Al, O, P, and C. The FTIR results indicate that the coatings contain hydroxyl and phosphate radicals.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2007年第3期203-206,共4页
Corrosion Science and Protection Technology
关键词
植酸
转化膜
工艺参数
耐蚀性
phytic acid
conversion coatings
processing paragheters
corrosion resistance
