免水洗常温锰系磷化膜的制备与性能
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摘要
将Q235钢试片在磷酸二氢锰、硝酸锰、钼酸钠、氟硼酸钠等组成的锰系磷化液中常温磷化后,自然干燥3h,制备了免水洗的彩色锰系磷化膜。考察了磷化液pH、磷化时间、磷化温度等工艺参数对磷化膜耐腐蚀性能的影响,用SEM及EDS分析了磷化膜的形貌和组成。结果表明,在磷化液pH为2.3~3.1、磷化温度5~40℃下浸渍磷化5~12min,可生成均匀、致密的彩色锰系磷化膜,其在质量分数3%氯化钠溶液中的耐腐蚀时间>90min。喷涂铁红环氧底漆后,漆膜耐冲击性能达50cm,漆膜的附着力为1级。
A washing-free colourful manganese phosphate film was prepared on the surface of Q235 steel specimen at room temperature in manganese phosphate solution containing manganese dihydrogen phosphate,manganese nitrate,sodium molybdate,sodium fluoborate by phosphating and then natural drying for 3hours.The effect of pH value of phosphating solution,phosphating time,phosphating temperature on the properties of phosphating films were investigated.The morphology and composition of phosphating film were analysized through SEM and EDS.The results show that continuous and compact phosphate film was generated when the specimen was phosphated for 5~12min at 5~40 ℃in phosphating solution with pH value of 2.3~3.1.This film can resist the corrosion of 3wt%sodium chloride solution for over 90 minutes.The paint film sprayed with iron-red epoxy primer possessed impact resistance of 50 cm and adhesion force of 1grade.
A washing-free colourful manganese phosphate film was prepared on the surface of Q235 steel specimen at room temperature in manganese phosphate solution containing manganese dihydrogen phosphate,manganese nitrate,sodium molybdate,sodium fluoborate by phosphating and then natural drying for 3hours.The effect of pH value of phosphating solution,phosphating time,phosphating temperature on the properties of phosphating films were investigated.The morphology and composition of phosphating film were analysized through SEM and EDS.The results show that continuous and compact phosphate film was generated when the specimen was phosphated for 5~12min at 5~40 ℃in phosphating solution with pH value of 2.3~3.1.This film can resist the corrosion of 3wt%sodium chloride solution for over 90 minutes.The paint film sprayed with iron-red epoxy primer possessed impact resistance of 50 cm and adhesion force of 1grade.
引文
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[3]李文超,张明明,乔静飞,等.冷轧钢表面磷化膜和硅烷膜的制备与性能[J].腐蚀与防护,2015,36(4):334-337.
[4]刘迎新,余取民,刘婷琛,等.清洁型免水洗的常温锰钙钡系磷化液研究[J].表面技术,2013,42(2):89-91.
[5]李红玲.铝合金表面无铬环保型化学转化膜工艺[J].腐蚀与防护,2014,35(2):169-174.
[6]储荣邦,万云生.清洁型低温低磷磷化工艺[J].电镀与涂饰,2014,33(22):987-988.
[7]王建平.实用磷化及相关技术[M].北京:机械工业出版社,2009:12-13.
[8]胡国辉,郝庆义,李晓卫.金属磷化工艺技术[M].北京:国防工业出版社,2009:92.
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