热浸镀锌层上丙烯酸树脂和钨酸盐复合钝化工艺研究
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摘要
运用丙烯酸树脂与钨酸盐复合钝化,通过正交试验法对热镀锌层钝化工艺进行了优化。此外,采用单因素变量法、硫酸铜点滴试验、中性盐雾腐蚀试验以及电化学测试研究了工艺参数对钝化膜外观和耐蚀性的影响。结果表明:最佳钝化工艺:45 g/L丙烯酸树脂,25 g/L钨酸钠,8 g/L硫脲,15 g/L KF,10 m L/L H_2O_2,pH值为11,钝化40 s,钝化温度30℃。通过最优钝化工艺能获得表面平整、光亮的钝化膜。钝化膜中性盐雾试验出现白锈的时间可达72 h,明显优于未钝化镀锌层。
Using acrylic resin and sodium tungstate composite passivation, the passivation process of hot dip galvanizing layer was optimized by orthogonal test method. In addition, the effects of process parameters on the appearance and corrosion resistance of the passivation film were studied by single factor variable method, copper sulfate dripping test, neutral salt spray corrosion test and electrochemical test. The results show that the optimal passivation technology: 45 g/L acrylic resin, 25 g/L Na2 WO4·2 H2 O, 8 g/Lthiourea, 15 g/L KF, 10 m L/L H2 O2, pH=11, passivation time 40 s, and passivation temperature 30 ℃.The passivation film which is smooth and bright can be obtained by the optimal passivation technology. The time of the appearance of white rust in passive film neutral salt spray test is 72 h, which is significantly better than the non-passivated galvanized layer.
Using acrylic resin and sodium tungstate composite passivation, the passivation process of hot dip galvanizing layer was optimized by orthogonal test method. In addition, the effects of process parameters on the appearance and corrosion resistance of the passivation film were studied by single factor variable method, copper sulfate dripping test, neutral salt spray corrosion test and electrochemical test. The results show that the optimal passivation technology: 45 g/L acrylic resin, 25 g/L Na2 WO4·2 H2 O, 8 g/Lthiourea, 15 g/L KF, 10 m L/L H2 O2, pH=11, passivation time 40 s, and passivation temperature 30 ℃.The passivation film which is smooth and bright can be obtained by the optimal passivation technology. The time of the appearance of white rust in passive film neutral salt spray test is 72 h, which is significantly better than the non-passivated galvanized layer.
引文
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[2]刘仁志.取代铬酸盐钝化处理工艺的动向[J],全面腐蚀控制,2012(11):40-44.
[3]刘艳荣,周婉秋,赵强,等.镀锌板表面无铬钝化的研究进展[J].电镀与精饰,2010,32(4):22-26.
[4]王静,伍林,宋世红,等.镀锌层无铬钝化膜耐蚀性研究[J].材料保护,2008,41(11):28-30.
[5]李宇鹏,伍林,易德莲,等.镀锌板复合钝化工艺的研究[J].化学与生物工程,2010,27(1):75-78.
[6]Li Y P,Wu L,Liu M.The electrochemical behavior and microstructure of chromium-free passivation film on galvanized steel[J].Advanced Materials Research,2010,150/151:947-950.
[7]Yoshimi N,Matsuzaki A,Yamashita M.Recent trend of chromium-free coated sheetsfor electrical appliances[J].Journal of Surface and Finishing Japan,2003,54(5):344-349.
[8]宫丽,卢燕平.热镀锌板钼酸盐钝化膜的改性及耐蚀性[J].钢铁研究学报,2007,19(3):88-92.
[9]郭德宇,袁训华,张爱国,等.批量热镀锌钼酸盐无铬钝化膜的耐蚀性能[J].材料保护,2016(5):12-14.
[10]肖鑫,龙有前,钟萍,等.锌镀层钼酸盐-氟化锆体系钝化工艺研究[J].腐蚀科学与防护技术,2005,17(3):184-186.
[11]Yang X K,Fan Y Y,Jiang Y H,et al.Study on chromium-free color passivation for zinc coating treated with silicate[J].Advanced Materials Research,2011,154:1301-1304.
[12]范云鹰,陈高伟,金海玲.镀锌层硅酸盐钝化工艺及其机理[J].材料保护,2013,46(12):44-46.
[13]范云鹰,金海玲,崔欢欢,等.镀锌层无铬硅酸盐彩色钝化膜成膜机理及其性能[J].四川大学学报(自然科学版),2015,36(2):220-223.
[14]Liu C H,Zhang Y J,Dong P,et al.Research progress in silicate passivation of galvanizing coating[J].Materials Protection,2013(2):89-93.
[15]Lai D L,Kong G,Che C S.Research progress of titanium-based passivation film on hot-dip galvanized steel[J].Electroplating&Finishing,2015(2):79-89.
[16]范云鹰,崔欢欢.钛对镀锌层硅酸盐钝化膜的影响[J].四川大学学报(自然科学版),2015,36(5):593-597.
[17]Kobayashi Y,Fujiwara Y.Effect of SO42-on the corrosion behavior of cerium-based conversion coatings on galvanized steel[J].Electrochimica Acta.,2006,51(20):4236-4242.
[18]刘晓,马利飞,李运刚.稀土镧和铈对双相不锈钢耐腐蚀性能的影响[J].材料热处理学报,2016,37(1):112-118.
[19]张振海,叶鹏飞,徐丽萍,等.热镀锌板表面无机组分与有机硅烷复合钝化膜[J].表面技术,2013,42(2):74-79.