A novel chrome-free Ti–P composite film was prepared by casting a mixed solution containing titanium and phosphorus species, which is able to seal the pores on the tinplate surface. The obtained film was characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The surface porosity sealing effect on tinplates was verified by using a glow discharge spectrometer (GDS), porosity tests, and XPS. The results show that the film on the tinplates is composed of TiO _(2) , Ti _(3) (PO _(4) ) _(4) · n H _(2) O, and FePO _(4) . Micropores on the tinplates are reduced apparently after film deposition, and the content of iron exposed in the pores is decreased significantly. An obvious concentration peak of phosphorus at a depth of around 0.75 μm infers that the film can penetrate into the micro-pores. The film lead to a 42.5% decrease in the surface porosity of the tinplates, exhibiting an outstanding surface porosity sealing effect in comparison with pure Ti or P films. Mechanistic analysis using XPS indicates that Ti _(3) (PO _(4) ) _(4) · n H _(2) O and FePO _(4) in the film play a role in sealing the surface porosity.
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机译：通过浇铸含有钛和磷物质的混合溶液来制备新型无铬Ti-P复合膜，该溶液能够密封马口铁表面的孔。使用扫描电子显微镜（SEM），能量色散X射线能谱（EDS）和X射线光电子能谱（XPS）对获得的膜进行表征。通过使用辉光放电光谱仪（GDS），孔隙率测试和XPS验证了对马口铁的表面孔隙密封效果。结果表明，马口铁上的薄膜由TiO _（2），Ti _（3）（PO _（4））_（4）·n H _（2）O和FePO _（4）组成。镀膜后，马口铁上的微孔明显减少，孔中暴露的铁含量明显减少。在约0.75μm的深度处有一个明显的磷浓度峰值，表明该膜可以渗透到微孔中。该膜导致马口铁表面孔隙率降低42.5％，与纯Ti或P膜相比，具有出色的表面孔隙密封效果。使用XPS的机械分析表明，薄膜中的Ti _（3）（PO _（4）__（4）·n H _（2）O和FePO _（4）起到密封表面孔隙的作用。
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