摘要
通过化学氧化工艺在MB8镁合金表面制备了化学转化膜,研究了氧化液种类、浓度对镁合金及表面转化膜的电化学腐蚀行为的影响,用扫描电镜观察了表面转化膜电化学腐蚀前后的微观形貌,用电化学分析系统测试了不同溶液中的塔菲尔极化曲线,并对MB8镁合金的氧化及电化学腐蚀行为进行了分析。结果表明,经1.5min处理可以得到防护性能较好的氧化膜层,在0.5mol/LH2SO4、0.5mol/LNaOH和3.5%NaCl溶液中,带氧化膜镁合金的耐蚀性都比镁合金基体的耐蚀性好。
The influences of solution type and solution concentration on the corrosion behavior of the conversion film on MB8 magnesium alloy surface were studied. The morphology of the surface conversion film was observed by scanning electron microscope. The Tafle curve was measured by electrochemical analysis system in different solutions. The oxidation of MB8 magnesium alloy and electrochemical corrosion behavior were analyzed from the view points of corrosion pattern and surface film state. The results showed that the oxidation film with better corrosion resistance behavior may be obtained after oxidizing for 1.5 min. And in 0.5 mol/L H2SO4 solution, the self-corrosion potential changed from - 1. 72 V to - 1. 56 V; in 3.5% NaCl solution, the self- corrosion potential changed from-1.4 V to -1.2 V; and also the self - corrosion potential changed from - 1. 3 V to - 0.6 V in the 0.5 mol/L NaOH solution. Thus, the magnesium alloys with oxidation film had better corrosion resistance behavior compared with magnesium alloy matrix
出处
《材料保护》
CAS
CSCD
北大核心
2007年第11期13-15,共3页
Materials Protection
基金
长春工业大学科技发展基金资助项目(2006001)
关键词
MB8镁合金
腐蚀行为
化学转化膜
极化曲线
MB8 magnesium alloy
corrosion behavior
conversion film
polarization curve
