摘要
为提高镀锌层硅酸盐彩色钝化膜的耐蚀性能,缩短钝化时间,采用正交试验法对镀锌层硅酸盐彩色钝化工艺进行了优化。通过对彩色钝化膜的Tafel曲线测试、阻抗测试、5%CuSO4点滴、中性盐雾腐蚀,研究工艺参数对钝化膜外观和耐蚀性的影响。结果表明,最佳工艺条件:25 g/L硅酸钠,8 g/L硫酸锌,15 mL/L双氧水,14g/L DK-WSC;pH值2.5～3.0,温度30℃,钝化时间80～120 s。本工艺能获得外观艳丽、光亮的膜层;钝化膜中性盐雾腐蚀出白锈时间达75 h。
The silicate color passivation process for electroplated Zn coating was optimized based on orthogonal test so as to improve the corrosion resistance of the passivation coating and shorten the passivation time.The effects of passivation parameters on the appearance and corrosion resistance of the passivation coating were investigated in relation to measurement of Tafel curve,resistance,dripping test of 5%CuSO_4,and neutral salt- spray test.Results indicated that the passivation fluid with the optimal composition consisted of 25 g/L Na_2SiO_3 ? 9H_2O,8 g/L ZnSO_4,15 mL/L H_2O_2,and 14 g/L DK- WSC;and the optimal passivation parameters were suggested as pH value of 2.5 ~ 3.0,temperature of 30 ℃,and passivation time of 80 ~ 120 s.Resultant passivation coating was bright and colorful,and it was able to endure neutral salt-spray for over 75 h.
出处
《材料保护》
CAS
CSCD
北大核心
2014年第4期39-41,7,共3页
Materials Protection
基金
国家自然科学基金(51361018)
关键词
彩色钝化
硅酸盐
镀锌层
工艺优化
正交试验
耐蚀性能
color passivation
sililate
electroplated zinc coating
process optimization
orthogonal test
corrosion resistance
