AZ91镁合金磷化液配方及优选

发布时间：2018-06-15 16:31

  本文选题：AZ镁合金 + 磷化工艺　； 参考：《材料保护》2016年10期

【摘要】：为了进一步提高镁合金表面磷化膜的耐腐蚀性能,采用锌系磷化液对AZ91镁合金进行磷化处理。采用扫描电镜及能谱仪分析磷化膜的形貌及成分;采用浸泡试验和极化曲线分析磷化膜的耐腐蚀性能。通过正交试验优选磷化液配方。结果表明:最优磷化工艺为2.0 g/L氧化锌,5 m L/L磷酸,0.2 g/L十二烷基磺酸钠,0.1 g/L酒石酸,0.2 g/L钼酸铵,0.3 g/L氟化钠,时间40 min,温度40℃,pH值2.5;优化工艺下所得磷化膜微观形貌均匀细致、厚度均匀、腐蚀失重小、腐蚀电流密度低,可有效地抑制镁合金的腐蚀。
[Abstract]:In order to further improve the corrosion resistance of magnesium alloy surface phosphating film, zinc phosphating solution was used to phosphate AZ91 magnesium alloy. The morphology and composition of phosphating film were analyzed by SEM and EDS, and the corrosion resistance of phosphating film was analyzed by immersion test and polarization curve. The formula of phosphating solution was optimized by orthogonal test. The results showed that the optimal phosphating process was 2.0 g / L zinc oxide 5 mL / L phosphoric acid 0.2 g / L sodium dodecyl sulfonate 0.1 g / L ammonium molybdate 0.2 g / L ammonium molybdate 0.3 g / L sodium fluoride for 40 min and pH value 2.5 at 40 鈩，

本文编号：2022683