采用由氧化锌12g/L、氢氧化钠94 g/L、2-氨基-3-羧基吡啶4.2 g/L、四乙烯五胺17g/L、三乙醇胺2g/L、专利表面活性剂0.5 g/L及碳三氧化二铬(粒径2μm)0～ 11 g/L组成的镀液,于温度50℃、pH 6.5和电流密度4A/dm2的条件下,在低碳钢上电镀Zn-Cr2O3复合镀层.其显微硬度采用维氏硬度计测量,耐磨性用Taber磨耗试验机测量,表面形貌和显微组织采用扫描电镜(SEM)、X射线衍射(XRD)及X射线光电子能谱(XPS)进行分析,在3,5％(质量分数)NaCl溶液中的耐蚀性以电化学阻抗谱(EIS)评价.证实了锌基体中存在团聚的Cr2O3颗粒.与纯锌镀层相比,Zn-Cr2O3复合镀层的机械性能及耐蚀性能更好.
Zn-Cr2O3 composite coatings were prepared on mild steel by electroplating from a cyanide-free bath containing ZnO 12 g/L,NaOH 94 g/L,2-amino-3-carboxypyridine 4.2 g/L,tetraethylenepentamine 17 g/L,triethanolamine 2 g/L,proprietary surfactant 0.5 g/L and Cr2O3particles (2 μm in diameter) 0-11 g/L at temperature 50 ℃,pH 6.5,and current density 4 A/dm2.The microhardness of the composite coatings was examined by Vickers tester,the wear resistance by Taber abrasion tester,the surface morphology and microstructure by scanning electron microscopy (SEM),X-ray diffraction (XRD),and X-ray photoelectron spectroscopy (XPS),and the corrosionresistance by electrochemical impedance spectroscopy (EIS)in 3.5wt％ NaCl solution.The existence of aggregated Cr2O3particles in zinc matrix was confirmed.The Zn-Cr2O3composite coatings exhibit superior mechanical properties and corrosion resistance to zinc coatings.
参考文献
| [1] | AFIFI S E;EBAID A R;HEGAZY M M.The effect of additives on zinc deposited from zinc sulphate solutions[J].Journal of the Minerals Metals & Materials Society,1992(01):32-34. |
| [2] | A.M.Alfantazi;D.B.Dreisinger .The role of zinc and sulfuric acid concentrations on zinc electrowinning from industrial sulfate based electrolyte[J].Journal of Applied Electrochemistry,2001(6):641-646. |
| [3] | D.S. Baik;D.J. Fray .Electrodeposition of zinc from high acid zinc chloride solutions[J].Journal of Applied Electrochemistry,2001(10):1141-1147. |
| [4] | GALVANI F;CARLOS I A .The effect of the additive glycerol on zincelectrodeposition on steel[J].Metal Finishing,1997,95(02):70-72. |
| [5] | GRINCEVICHENE L;VISHOMIRSKIS R;JAKOBSON S et al.The influence of inorganic ion species on the elecirodeposition of zinc fromweak acid zinc eleetrolytes[J].Metal Finishing,1995,93(07):12-14. |
| [6] | PAUNOVIC M;SCHLESINGER M.Fundamentals of Electrochemical Deposition[M].New York:John Wiley and Sons,Inc,1998 |
| [7] | Raeissi K.;Saatchi A.;Golozar MA. .Effect of nucleation mode on the morphology and texture of electrodeposited zinc[J].Journal of Applied Electrochemistry,2003(7):635-642. |
| [8] | Bapu GNKR;Jayakrishnan S .Oxidation characteristics of electrodeposited nickel-zirconia composites at high temperature[J].Materials Chemistry and Physics,2006(2/3):321-325. |
| [9] | Omer O. Van der Biest;Luc J. Vandeperre .ELECTROPHORETIC DEPOSITION OF MATERIALS[J].Annual review of materials research,1999(0):327-352. |
| [10] | CELLS J P;ROOS J R;BUELENS C .A mathematical model for the electrolytic codeposition of particles with a metallic matrix[J].Journal of the Electrochemical Society,1987,134(06):1402-1408. |
| [11] | HASHIMOTO S;ABE M .Characterization of electrodeposited Zn-SiO2composites before and after corrosion test[J].Corrosion Science,1994,36(12):2125-2137. |
| [12] | Kondo K.;Obgishi A. .Electrodeposition of Zinc-SiO_2 Composite[J].Journal of the Electrochemical Society,2000(7):2611-2613. |
| [13] | Gomes A;Pereira MID;Mendonca MH;Costa FM .Zn-TiO2 composite films prepared by pulsed electrodeposition[J].Journal of solid state electrochemistry,2005(4):190-196. |
| [14] | R. Starosta;A. Zielinski .Effect of chemical composition on corrosion and wear behaviour of the composite Ni-Fe-Al_2O_3 coatings[J].Journal of Materials Processing Technology,2004(0):434-441. |
| [15] | PARLITZ B;HANKE W;FRICKE R et al.Studies on catalytically active surface compounds:XV.The catalytic oxidation of ethanol on Cr/SiO2catalysts and some relations to the structure[J].Journal of Catalysis,1985,94(01):24-36. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%