摘要
研究了不同浓度的草酸钠对镀锌层三价铬蓝白钝化膜的外观,电化学阻抗,耐乙酸铅点滴与中性盐雾腐蚀性能,以及钝化液使用寿命的影响。研究发现,以CrCl3.6H2O为主要成膜物,当CrCl3.6H2O和草酸钠的质量浓度分别为110 g/L与89.0 g/L时,可获得外观均匀光亮的蓝白色钝化膜,钝化膜在5%(质量分数)NaCl溶液中的低频阻抗值最大,耐乙酸铅点滴时间和耐中性盐雾腐蚀时间最长,钝化液的使用寿命也最长。
The influence of sodium oxalate with different concentrations on the appearance, electrochemical impedance, lead acetate dropping corrosion resistance, and neutral salt spray corrosion resistance of trivalent chromium bright blue passivation film on zinc-plated coating as well as the service life ofpassivation solution was studied. The passivation film obtained from a bath containing 110 g/L CrCl3·6H2O as main film-forming material and 89.0 g/L sodium oxalate is uniform, bright, and blue, has the highest low frequency impedance in 5wt% NaCl solution, and lasts the longest time in lead acetate dropping corrosion test and neutral salt spray test. The said passivation bath has the longest service life.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2012年第3期23-26,共4页
Electroplating & Finishing
关键词
镀锌层
蓝白钝化
三价铬
草酸钠
耐蚀性
zinc-plated coating
bright blue passivation
trivalent chromium
sodium oxalate
corrosion resistance
