镀锌钢板表面无铬钝化研究进展

综述了镀锌钢板无铬钝化的研究现状,着重介绍了几种有机、无机钝化工艺以及有机、无机联合钝化工艺,并展望了无铬钝化技术的发展趋势。     

镀锌钢板表面耐腐蚀硅烷膜的制备

采用氨丙基甲基二甲氧基硅烷钝化镀锌钢板。通过交流阻抗,盐雾实验检测试样的耐腐蚀性能,结果表明：试样经硅烷钝化后阻抗值达到1 600Ω,抗白锈时间达到36 h,相对于空白样大幅度提高。清漆划格实验表明清漆与试样的附着力良好。原子力显微镜检测显示硅烷膜均匀致密。并初步探讨了硅烷成膜机理。     

铝管表面硅烷稀土复合膜的制备及性能研究

在60℃时采用浸渍法制备硅烷稀土复合膜,通过先在试样表面自组装一层γ-氨丙基三乙氧基(γ-APS)硅烷薄膜,再在膜上沉积稀土铈转化膜制得硅烷稀土复合膜。采用电化学、失重和盐雾实验对铝管表面硅烷稀土复合膜的耐蚀性进行考察。线性电位扫描、Tafel曲线和交流阻抗(EIS)的结果均表明其耐蚀性与空白样相比,极化电阻和自腐蚀电流均提高了两个数量级,阻抗阻值提高了2倍;盐雾实验结果也表明其抗蚀能力提高了3倍;SEM显示其复合膜层均匀致密,EDS检测分析表明复合膜主要由N,O,Si,Al和Ce等元素组成;初步探讨了复合膜的耐蚀机制。     

利用棉籽油制备二聚酸的副产物开发生物柴油的研究

以棉籽油制备二聚酸的工业副产物为原料,采用对甲苯磺酸作催化剂进行酯化反应制备生物柴油.试验考察了反应条件对酯化率的影响,试验结果表明:在反应温度为75℃,催化剂用量为脂肪酸质量的8%,醇酸物质的量比为3:1的条件下,反应4h,酯化率可以达到97%.反应后对产物进行减压旋转蒸发,回收甲醇和催化剂.该试验操作方便,催化剂活性高,污染小,酯化率高.     

Study on corrosion resistance of the BTESPT silane cooperating with rare earth cerium on the surface of aluminum-tube

Bis-3-(triethoxysilyl)propyltetrasulfide(BTESPT) silane-rare earth cerium composite coatings on aluminum-tube were prepared at 60 °C by immersion method.The performance of composite coatings to protect the aluminum-tube against corrosion was investigated with potentiodynamic polarization curves,electrochemical impedance spectroscopy(EIS),and salt spray test(SST).The results of potentiodynamic polarization curves and EIS indicated that the self-corrosion current decreased by two orders of magnitude and the impedance values increased to 20 k?/cm2;the result of salt spray test showed that the anti-corrosion time increased by three times,which indicated that the corrosion resistant capability of the composite coatings was improved significantly.The scanning electron microscopy(SEM) photograph showed that the conversion coating was uniform and dense.The energy dispersive spectrometer(EDS) was used to analyse coating composition,which was mainly S,O,Si,Al and Ce.The formation and corrosion mechanism of the composite coating were also studied.     

镀锌钢板表面耐腐蚀稀土镧盐转化膜的制备

采用稀土镧在镀锌钢板表面制备耐腐蚀的转化膜,通过交流阻抗、失质量和盐雾实验检测镧盐转化膜的耐腐蚀性能,实验结果表明:试样表面生成镧盐转化膜后,其阻抗值相对于空白试样大幅度提高,腐蚀速率降低近1个数鼍级,抗白锈时间达到54 h;原子力显微镜检测结果显示镧盐转化膜由大量无定形的固体颗粒沉积而成,膜质不均匀;EDS能谱检测结果表明镧盐转化膜由O、Fe、Zn和La元素组成.