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采用扫描电镜观察表面形貌,利用电化学工作台测试极化曲线,研究了聚丙烯酰胺(HPAM)封孔工艺中封闭温度、封孔时间以及添加剂等参数对铝合金微弧氧化膜封孔效果的影响,并研究了加入添加剂后进行封孔试样的耐蚀性。结果表明,封孔温度越高和封孔时间越长,聚丙烯酰胺对铝合金微弧氧化膜层封孔效果越好。但是,温度超过60℃时会产生过渡交联,膜层表面变的粗糙且出现裂纹,封孔效果变差。相比不加添加剂三乙醇胺封孔的试样,封孔效果较好,铝合金微弧氧化膜层自腐蚀电位更高,自腐蚀电流更小,耐蚀性得到显著提高。
The morphology of the surface was observed by scanning electron microscopy. The polarization curves were measured by electrochemical workstation. The effects of sealing temperature, sealing time and additives on the sealing effect of micro-arc oxidation coating on aluminum alloy were studied. The corrosion resistance of the plugged samples after addition of additives was studied. The results show that the higher the sealing temperature and the longer the sealing time, the better the sealing effect of polyacrylamide on the micro-arc oxidation coating of aluminum alloy. However, when the temperature exceeds 60 ℃, the transitional cross-linking will occur, the surface of the film will become rough and crack, and the sealing effect will be worsened. Compared with the sample without Triethanolamine plugging, the plugging effect is better. The micro-arc oxidation film of the aluminum alloy has higher self-corrosion potential, smaller self-corrosion current and markedly improved corrosion resistance.