硫酸盐体系电沉积光亮Zn-Fe合金添加剂的研究

运用hull槽试验，小槽电镀试验和电化学循环伏安等技术，研究了镀液组成，添加剂和工艺条件等对镀层质量及其耐蚀性的影响。开发了一种在弱酸性硫酸盐体系中获得含铁量约为0．5％的光亮Zn-Fe合金的电镀技术，讨论了添加剂中各组成的作用。结果表明，该添加剂具有高光亮度，高耐盐性和高浊点等3大优点，可使锌铁合金镀层结晶细致，耐蚀性增强。     

Synthesis and Properties of a One-Dimensional Mixed-Ligand Cd(Ⅱ) Complex with Helical Structure

The title complex,[[Cd(Him)(OH-BDC)(H2O)2]·3H2O]n(1) (Him is imidazole,OH-H2BDC is 5-hydroxyisophthalic acid),was synthesized by liquid/liquid diffusion method at room temperature.The complex crystallizes in orthorhombie,space group P212121,with a = 0.671 6(7),b = 1.380 6(2),c =1.7421(2) nm,V = 1.615 2 (3) nm3,C11 H18 CdN2O10,Mr = 450.67,Dc = 1.853 g/cm3,μ =1.407 mm-1,F(000) = 904,Z = 4,the final R1 = 0.020 9 and wR 2 = 0.045 3 for 3 211 observed reflections (Ⅰ＞ 2σ (Ⅰ)).In the structure of 1,the OH-BDC ligands exhibiting bis-bidentate coordimtion mode bridge the adjacent Cd centers to form a one-dimensional helical chain and the second ligand Him acting as terminal ligands are attached to the helical chain.It is notable that a series of complicated hydrogen bonds (e.g.,N-H ...O,O-H...O) exist in the structure,which link neighboring helices into a three-dimensional supramolecular architecture.An observed intense blue luminescence with an emission band peaking at 390 nm for 1 may be resulted from ligand-to-metal charge transfer (LMCT).