The low-Cr iridescent passivation bath developed for low-phosphorus Zn-Fe-P ternary alloy electroplating is composed of CrO3 13 g/L, activating agent 10 g/L, and a certain amount of Si-containing compound. The process parameters for sealing the passivation films are as follows: silicone solution 20 mL/L, glycerin 40 mL/L, a small amount of surfactant, room temperature, pH 3-5, and immersion time 30 s. The morphologies of passivation films were analyzed by scanning and transmission electronrnmicroscopy. The corrosion resistance of passivation films was examined by polarization curve measurement in 5wt% NaCl solution and neutral salt spray test. The results showed that the Si-containing passivation film has better resistance to immersion in 80 °C water for 3 min and to thermal shock at 120 °C for 1 h than a conventional passivation film. The Si-containing passivation bath with the addition of stabilizing agent was stable without gelation in 4 months. The hydrophobicity of passivation film is improved obviously by sealing due to the filling up of micro-cracks of the passivation film with nano-SiO2.%与锌铁低磷三元合金电镀工艺相配套的低铬彩色钝化液主要由13 g/L CrO3、10 g/L活化剂和适量含硅化合物组成.钝化膜封闭的工艺条件为:有机硅溶液20 mL/L,甘油40 mL/L,表面活性剂少许,pH3～5,室温,浸泡时间30S.采用扫描电镜和透射电镜分析了钝化膜的微观形貌.通过在5％(质量分数)NaCl溶液中的极化曲线测量以及中性盐雾试验,考察了钝化膜的耐蚀性.结果表明,含硅钝化膜耐80℃热水浸泡3 min及耐120℃热冲击1h的性能优于常规钝化膜.加入稳定剂可使含硅钝化液存放4个月而不发生凝胶现象.封闭后,钝化膜的微裂纹中填充了纳米SiO2,其憎水性明显提高.
展开▼
机译：不锈钢成分铬，铁铬，铁铬钼，镍的钝化和钝化分解（passivering en afbraak van de passieve Laag van de Bestanddelen van Roestvast staal Chroom，Ijzer-Chroom，Ijzer-Chroom-molybdeen，Nikkel）
