摘要
将AZ91D压铸镁合金于室温下浸渍在KH-550/乙醇/去离子水=5/80/15（体积分数）的混合溶液（水解时间2 h,p H=7～10）中90 s,取出经120℃×60 min固化处理制备了硅烷膜试样。采用电导率在线测量法研究了p H值对KH-550水解的影响,通过点滴试验、中性盐雾试验和电化学阻抗谱评价了硅烷膜的耐蚀性能。结果表明,当p H=9时,KH-550溶液同时具有最优的水解程度和稳定性;随p H值的增加,硅烷膜试样的耐蚀性能先上升后下降,当p H=9时,硅烷膜的耐蚀性能最佳。
The silane coating on AZ91D die casting magnesium alloy was fabricated by immersion in a KH-550/ethanol/ deionized water=5/80/15 （vol%） mixed solution （hydrolysis time 2 h, pH=7-10） at room temperature for 90 s before being cured at 120℃ for 60 min. The influences ofpH values on hydrolysis of KH-550 were investigated through monitoring the change of conductivity. The corrosion resistance of silane film was evaluated by dripping test, neutral salt spray （NSS） test and electrochemical impedance spectroscopy, respectively. The results show that KH-550 solution has the best hydrolysis and stability when pH value is to 9. The corrosion resistance of the silane coating initially increases and then decreases with the increase ofpH value. For the solution with pH=9, the silane coating exhibits the best corrosion resistance.
出处
《热加工工艺》
CSCD
北大核心
2016年第10期187-189,193,共4页
Hot Working Technology
基金
湖南省自然科学基金资助项目(2015JJ2064)
关键词
AZ91D镁合金
PH值
水解
硅烷膜
耐蚀性
AZ91D alloy
pH value
hydrolysis
silane coating
corrosion resistance
