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磷化是涂装前处理的中心环节,是指把金属工件经过含有磷酸二氢盐的酸性溶液处理,发生化学反应而在其表面生成一层稳定的不溶性磷酸盐膜层的方法,所生成的膜称为磷化膜。黑色金属涂装前处理通常采用磷化工艺来提高涂层的附着力和耐蚀性。但是磷化过程不可避免的产生含磷、重金属的废水,以及大量的磷化渣等污染物,这成为制约涂装发展的重要因素。因此,发展无磷、无重金属排放的涂装前处理技术已经成为研究热点。针对涂装前处理的工艺特点,研究了一种新型纳米无磷转化前处理工艺,其工艺原理是:通过控制
Phosphating is the central part of pre-treatment coating, refers to the metal workpiece containing dihydrogen phosphate acid solution treatment, the chemical reaction and the surface to generate a stable insoluble phosphate coating method, the resulting Films are called phosphating films. Black metal coating pre-treatment usually phosphating process to improve the adhesion and corrosion resistance of the coating. However, the phosphating process inevitably produces phosphorus and heavy metal wastewater, as well as a large number of pollutants such as phosphorus slag, which has become an important factor restricting the development of the coating. Therefore, the development of non-phosphorus, non-heavy metals emission coating pre-treatment technology has become a research focus. Aiming at the characteristics of the pretreatment before painting, a new pretreatment process for non-phosphorus conversion of nano-scale was studied. The principle of the process was as follows: