摘要
占空比是影响微弧氧化过程和微弧氧化膜结构与性能的重要因素之一。研究了恒定的电流密度、频率、微弧氧化时间下,正占空比对ZK60镁合金微弧氧化电压和氧化膜结构与耐腐蚀性能的影响。结果表明:正占空比对ZK60镁合金微弧氧化起弧电压和起弧时间的影响较小,微弧氧化终电压随正占空比的增大而增大;正占空比增加,促进了镁合金与溶液的反应,在相同微弧氧化时间内形成的陶瓷膜厚度逐渐增加,镁合金耐腐蚀性能提高,但在正占空比达到50%后,提高正占空比不能提高镁合金的耐腐蚀性能,甚至会使其降低。
Micro-arc oxidation ceramic coat-ing was prepared on the surface of ZK60 Mg alloy.The effect of positive pulse duty cycle on arcing voltage as well as microstruc-ture and corrosion resistance of the micro-arc oxidation coating was investigated.Results indicate that positive pulse duty cycle has little effect on arcing voltage and time,but the final voltage of micro-arc oxidation increases with increasing positive duty cycle.Increasing positive pulse duty cycle helped to promote the reaction of Mg alloy and the electrolyte,leading to increased thickness and corrosion resistance of micro-arc oxidation ceramic coating.How-ever,when the positive duty cycle reached 50 %,further increase did not contribute to improved corrosion resistance of the micro-arc oxidation coating.
出处
《材料保护》
CAS
CSCD
北大核心
2010年第9期39-41,58,共4页
Materials Protection
关键词
微弧氧化
占空比
ZK60镁合金
陶瓷膜
耐蚀性
micro-arc oxidation
duty cycle
ZK60 magnesium alloy
ceramic coating
corrosion resistance
