掺杂纳米TiO_2对水性铝基金属微粉涂层的影响

为了提高水性铝基金属微粉涂层的附着力和耐腐蚀性能,利用纳米TiO_2掺杂制备了不同纳米SiO_2含量的水性铝基金属微粉涂层。采用接触角仪测定涂料与基体Q235钢之间的接触角,采用划线划格法测定了涂层的结合强度,采用电化学极化和全浸试验法测试分析了涂层的耐腐蚀性能,采用金相显微镜和X射线衍射仪(XRD)分析了镀层的组织结构。结果表明:水性铝基金属微粉涂料中添加TiO_2后,接触角降低,使得涂层铝粉排列几乎与基体保持平行并呈现层状堆积,提高了涂层附着力、耐腐蚀性;涂料中的纳米TiO_2改善铝粉的润湿性并作为填充物填充在涂层孔隙之间,使涂层结构更加密实并且铝粉提供了物理屏蔽作用;在所研究的范围内,TiO_2最佳用量为0.4 g。

Effect of Doped Nano-TiO2 on Properties of Waterborne Aluminum Based Micro-Particle Metal Coating

Waterborne aluminum based micro-particle metal coatings with different nano-TiO2 contents were prepared by doping nano-TiO2.The contact angle instrument was used to measure the contact angle between the coating and Q235 steel substrate,and the adhesion strength of coating was characterized by cross hatch and tape test.Moreover,the electrochemical polarization and whole immersion experiments were employed to evaluate the corrosion resistance of coating,and the structure of coating was analyzed by metallographic microscope and X-ray diffractometer (XRD).Results showed that after doping TiO2,the contact angle of waterborne aluminum based micro-particle metal coating decreased,and the aluminum particles in coating were arranged almost in parallel with the substrate and exhibited lamellar stacking characteristic,which indicated that the adhesion strength and corrosion resistance of coating were enhanced.Furthermore,the nano-TiO2 in coating improved the wettahility of aluminum particles and fulfilled the pores of coating as fillings,which further made the structure of coating denser and provided physical shielding protection for aluminum.In the exprimental range of this study,the optimal TiO2 content was 0.4 g.