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通过预先加入Fe2+,采用中温磷酸盐化学转化法(PCC),在不锈钢表面制备结构均匀、致密的磷酸锌转化膜。采用X射线衍射仪(XRD)、热场发射扫描电镜(FE-SEM)及电化学工作站对转化膜层进行表征,探讨了转化温度对转化膜相组成、微观形貌和电化学性能的影响。结果表明,所制备的转化膜呈灰色,由磷酸锌(Zn3(PO4)2·4H2O)及少量的磷酸锌铁(Zn2Fe(PO4)2·4H2O)组成。随温度的升高,转化膜晶粒趋向于细小均匀、致密。通过电化学分析可知,转化膜的耐蚀性好,且随温度升高转化膜的耐腐蚀性提高。
By pre-adding Fe2 +, using moderate temperature phosphate chemical conversion (PCC), stainless steel surface prepared uniform and dense zinc phosphate conversion coating. The conversion coatings were characterized by X-ray diffraction (XRD), thermal field emission scanning electron microscope (FE-SEM) and electrochemical workstation. The effects of conversion temperature on the phase composition, morphology and electrochemical properties of conversion coatings were investigated. The results showed that the prepared conversion coating was gray and consisted of zinc phosphate (Zn3 (PO4) 2.4H2O) and a small amount of zinc iron phosphate (Zn2Fe (PO4) 2.4H2O). With the increase of temperature, the crystal grains of the conversion coating tend to be fine and uniform. Electrochemical analysis shows that the corrosion resistance of the conversion coating is good, and the corrosion resistance of the conversion coating increases with increasing temperature.