硅的选择性氧化对冷轧钢板磷化性能的影响

Effect of Selective Oxidation of Silicon on Phosphating Performance of Cold-Rolled Steel Plates

为了研究硅的选择性氧化对冷轧钢板磷化性能的影响,对不同硅含量的冷轧钢板进行了磷化处理。利用电化学测试、X射线光电子能谱、透射电子显微镜与扫描电子显微镜分别对打磨前后的样品进行耐蚀性、成分和形貌分析。结果发现:冷轧钢板在退火过程中形成的硅氧化膜主要由Si、SiC、SiO_(2)和Si_(x)O_(y)组成。样品打磨前,硅含量较高的样板的磷化性能明显较差,形成的磷化膜耐蚀性也较差;样品打磨后,不同硅含量的样板的磷化性能已无明显差异。通过对冷轧钢板表面成分与微观结构进行分析,推断在硅含量较高的样品表面,硅的氧化层不易溶解在磷化液中。磷化过程中,阳极反应受到硅氧化层的阻碍,磷酸盐的沉积受到影响。硅的选择性氧化对冷轧钢板磷化性能的影响显著。

In order to study the effect of selective oxidation of silicon on phosphating performance of cold-rolled steel plates, phosphating was performed on cold rolled steel plates with different silicon contents. Electrochemical test, X-ray photoelectron spectroscopy, transmission electron microscopy and scanning electron microscopy were used to analyze the corrosion resistance, composition and morphology of the samples before and after grinding. Results showed that the silicon oxide film formed in the annealing process of cold-rolled steel plate was mainly composed of Si, SiC, SiO_(2) and Si_(x)O_(y). Before grinding, the phosphating performance of the samples with higher silicon contents was obviously worse, and the corrosion resistance of their phosphating films was also poorer. After grinding, the phosphating performance of samples with different silicon contents had no obvious difference. Through an analysis on the surface composition and microstructure of the cold-rolled steel plates, it could be concluded that the silicon oxide film on the surfaces of samples with high silicon contents was not easy to dissolve in the phosphating solution. During the phosphating process, the anode reaction was hindered by the silicon oxide film, and the deposition of phosphate was affected. In general, the selective oxidation of silicon had a significant effect on the phosphating performance of cold-rolled steel plates.