采用电化学方法研究了喷丸处理、酸洗处理、氧化铁皮对一种免酸洗钢磷化膜耐蚀性的影响。结果表明,喷丸处理样磷化膜组织和成分不均匀,磷化膜的耐蚀性较差;酸洗处理样磷化膜组织呈圆形颗粒状,腐蚀电位较高,腐蚀电流密度和阳极溶解速度较高,磷化膜的腐蚀溶解速度较快;氧化铁皮样磷化膜组织呈均匀致密竖条型,阳极溶解速率较低,磷化膜的腐蚀溶解速度最慢。 Electrochemical methods were used to study the effects of shot peening, pickling and oxide scale on the corrosion resistance of a phosphate-free film. The results show that the microstructure and composition of the shot peening phosphating film are not uniform, and the corrosion resistance of the phosphating film is poor. The pickling phosphating film is round and granular with higher corrosion potential, corrosion current density and anode The corrosion rate of phosphating film was faster than that of phosphating film. The microstructure of iron oxide scale-like phosphating film was uniform and compact vertical bar, the dissolution rate of anodic dissolution was lower, and the corrosion dissolution rate of phosphating film was the slowest.