中温磷化技术在钢管塑性加工中的应用  

Application of Medium-Temperature Phosphating Technology in Plastic Processing of Steel Pipe

作　　者：褚旭 彭杨 何源 周宪民[1] 吴伏生 周瑜 CHU Xu;PENG Yang;HE Yuan;ZHOU Xian-min;WU Fu-sheng;ZHOU Yu(Shenyang Parkerizing Co.,Ltd.,Shenyang 110000,China)

机构地区：[1]沈阳帕卡濑精有限总公司,辽宁沈阳110000

出　　处：《材料保护》2021年第2期104-108,共5页Materials Protection

摘　　要：为进一步促进中温磷化技术在钢管塑性加工中的应用,通过扫描电镜(SEM)、X射线衍射仪(XRD)、湿热试验箱、硫酸铜点滴试验法和退膜法对中温磷化处理的钢管的耐蚀性能进行了分析,确定了最佳的中温磷化工艺。研究表明,最佳的中温磷化工艺参数为:总酸度30~40 mg/L,游离酸度4.2~5.4 mg/L,促进剂浓度3~4mg/L,磷化温度70℃,磷化时间10 min;通过最佳中温磷化工艺所制备的钢管磷化膜结晶致密,晶粒尺寸均匀,磷化膜主要成分为Zn2Fe(PO4)·4H2O,磷化膜重可达到7.42 g/m^(2),磷化膜层平均厚度为3.0μm;钢管耐硫酸铜腐蚀时间超过300 s,耐湿热性能显著提升。In order to expand the application of medium-temperature phosphating technology in the plastic processing of steel pipe,the corrosion resistance of the steel pipe after medium-temperature phosphating was analyzed by scanning electron microscope (SEM),X-Ray diffraction (XRD),damp heat test chamber,copper sulfate drop test method and film stripping method. Besides,the best medium-temperature phosphating process was determined. Results showed that the optimum medium-temperature phosphating process parameters were as follows:total acidity 30 ~ 40 mg/L,free acidity 4.2 ~ 5.4 mg/L,accelerator concentration 3 ~ 4 mg/L,phosphating temperature 70 ℃,and phosphating time 10 min. The steel pipe phosphating film prepared by the optimal medium temperature phosphating process had dense crystal,uniform grain size,the main composition of the phosphating film was Zn2Fe(PO4)·4H2O,the weight of phosphating film reached 7. 42 g/m^(2),and the average thickness of phosphating film was 3.0 μm. The copper sulfate corrosion resistance time of the steel tube exceeded 300 s,and the heat and moisture resistance of the steel pipe was significantly improved.

关 键 词：中温磷化 钢管 塑性加工 磷化膜 耐腐蚀性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]