酸碱值
磷化液里产生磷化膜的铁离子浓度太低，那么所要求的酸碱值越大。相反来讲，铁离子含量越高，酸碱性越少。利用酸碱度控制高温锰系磷化液的游离酸很简单，例如酸碱性是1那么游离酸就是0.1。探索酸碱性对锰系磷化液的反应，结果显示，硝酸的含量0.5时，当酸碱值在5表示有钝化反应，产生钝化膜。酸碱性是2时，产生的膜是磷化膜和钝化膜的综合体，硝酸含量越大，磷化膜区域越大，当酸碱性是3的时候，就没有磷化膜形成了，所以高温锰系磷化液的酸碱性为2.5*好。
温度
对于所生产的磷化液，磷化是否能成膜，温度也是很重要的一个原因，温度对磷化膜和磷化效率的影响非常明显。适合的温度不仅能促使铁在阳极区域的融化和磷酸铁反应，缩短磷化膜形成的时间。还能激活能力低的地方，形成活化中心使晶体数量快速增加，形成结晶的速度加快，在反应的时候又有大批的中心点生成，晶体还没完全长大，又有新的晶体开始产生。结晶密度大，磷化膜细致紧密，磷化膜的厚度增厚，抗腐蚀的能力增强，温度太低形成磷化膜的磷化液含量达不到，不能生产完整的磷化膜。温度太大，导致可溶解型的成分的分离，分离出大量的锌离子和磷酸跟离子，使得大量的磷酸盐快速分离，产生大量沉渣，失去原来的动态平衡，常温磷化液温度太高时，不仅影响酸比的变动，而且反应速度太快，磷化膜结晶粗大，空隙率太大，产生磷化渣的超重量磷化膜，腐蚀性低，影响涂层的光泽，并使槽液稳定性变差。
ph Phosphating of phosphating film in liquid iron ion concentration is too low, so the required ph. Instead, the iron ions content is higher, the less acid alkaline. Use high manganese series phosphating solution of free acid ph control is very simple, such as acid, alkali is 1 then free acid is 0.1. Explore acid alkaline reaction of manganese series phosphating solution, results showed that nitrate content of 0.5, when ph 5 said passivation reaction, passivation membrane. Acid alkali is 2, the film is a complex of phosphating film and passivation film, the nitrate content, the greater the phosphating film area is larger, when the acid alkali is 3, phosphating film formed, so the department of high manganese phosphating liquid acid alkaline 2.5 is best. The temperature Whether can for the production of the phosphating liquid and phosphating film, temperature is an important one of the reasons, and temperature on the efficiency of the phosphating film and phosphating effect is very obvious. Suitable temperature can not only make the iron in the melting of the anode region and iron phosphate reaction, shorten the time of the phosphating film formation. Can also activate a region of low ability, forming the activation center the crystal quantity increase quickly, and form the crystallization speed, at the time of reaction and generation, the center of the large crystal haven't fully grown, and have new crystals begin to produce. Meticulous crystallization density, phosphating film closely, thickening of the thickness of the phosphating film, enhanced corrosion resistance, low temperature phosphating film formed of the phosphating liquid content of less than, can't complete phosphating film production. Temperature is too large, which leads to the separation of components can be dissolved, separating out large amounts of zinc ion and phosphate ion, makes a lot of phosphate rapid separation, produce large amounts of sediment, losing the original dynamic equilibrium, liquid at room temperature is too high, not only affect the change of acid ratio, and reaction speed too fast, the phosphating film crystallization bulky, void ratio is too large, produce phosphating phosphating film residue super weight, corrosion resistance is low, influence the luster of the coating, and bath stability. |
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