【摘要】 采用化学镀/溶胶-凝胶技术在碳钢表面制备了低磷(Ni-LP/TiO2)、中磷(Ni-MP/TiO2)和高磷(Ni-HP/TiO2)Ni-P/TiO2复合膜,采用X-衍射分析仪和环境扫描电镜表征了Ni-P/TiO2复合膜的结构与形态,应用动电位极化和极化阻力(Rp)测量研究了复合膜在0.5mol/L H2SO4溶液中的耐蚀性能。实验结果表明Ni-P/TiO2复合膜耐蚀性能优于Ni-P镀层,随Ni-P镀层磷含量的增加,Ni-P/TiO2复合膜的耐蚀性增强。Ni-HP/TiO2复合膜在0.5mol/L H2SO4溶液的自腐蚀电流密度(icorr)为3.15μA.cm-2,分别为Ni-LP/TiO2和Ni-MP/TiO2复合膜的40%和62%;其Rp为11.72kΩ.cm2,分别为Ni-LP/TiO2和Ni-MP/TiO2复合膜的1.5倍和1.3倍,Ni-HP/TiO2复合膜较Ni-LP/TiO2和Ni-MP/TiO2复合膜有更佳的耐蚀性能。更多还原

【Abstract】 The novel Ni-P/TiO2 composite films with different phosphorus contents were coated to the mild steels using the electroless nickel plating and sol-gel technique, and denoted as Ni-LP/TiO2, Ni-MP/TiO2 and Ni-HP/TiO2, respectively. The structure and chemical composition of Ni-P/TiO2 composite films were investigated using X-ray diffraction (XRD), environmental scanning transmission electron microscopy (ESEM) and energy dispersive X-ray spectrometer (EDX). The anti-corrosion performance of the composite film was characterized by potentiodynamic polarization technique and the polarization resistance measurement. The corrosion resistances of Ni-P/TiO2 composite films are better than that of Ni-P coatings. The corrosion resistance of Ni-P/TiO2 composite film increases with the increasing in phosphous content of Ni-P coating. The Ni-HP/TiO2 composite film possesses more excellent anti-corrosion performance than Ni-LP/TiO2 and Ni-MP/TiO2 films. The self-corrosion current density (icorr) of Ni-HP/TiO2composite film in 0.5 mol/L sulfuric acid is 3.15 μA·cm-2, which is 40% and 62% of that of Ni-LP/TiO2 and Ni-MP/TiO2 composite films, respectively. Its polarization resistance (Rp) is 11.72 kΩ·cm2, about 1.5 and 1.3 times that of Ni-LP/TiO2 and Ni-MP/TiO2 composite films, respectively. Compared to Ni-LP/TiO2 and Ni-MP/TiO2 composite films, it can be seen that Ni-HP/TiO2 composite film has a better corrosion resistance.更多还原