A Study Of Liquid Surface Conditioner For Phosphating

During pre-treatment of phosphating, surface conditioning is the most important means to gets high-quality phosphate conversion coating. The fine conditioner can offer good crystals embryo for growth of the phosphate conversion coating, and can improve phosphate conversion coating dense and reduce the film weight.Mostly it is solid surface conditioner used at present, which have dirty for coating process, and is unsuitable for assembly control in product line, etc. So, liquid surface conditioner has very good market prospects and good social benefit.The thesis studies several parts: poly-phosphate, ratio of PO4/Ti, ratio of K/Na etc. The result is that poly-phosphate has a important effect on phosphating or degreasing as a stabilizer, High ratio of PO4/Ti is benefit to form fine film, the higher the ratio of PO4/Ti is, the better the stabilization is, but the phosphate conversion coating gets bad. K+ ion can improve the characteristic of surface conditioner, the reasonable ratio of K/Na not only form fine phosphate conversion coating, but also form good film after pickling in low zinc phosphating. The thesis prodes into the following: the influence of the content of water, pH and temperature during the manufacture of liquid surface conditioner, concentration, temperature and time during the application of liquid surface conditioner. So, the thesis gets CS100 surface conditioner, the content, manufacture craft and application craft is following.The content:K2T1F6 :2.2%;By comparing the performance of CS100 liquid surface conditioner with the performance of domestic and international surface conditioner, the result shows: such performance as the phosphorus film appearance, film weight and crystal appearance is equal to those of domestic solid surface conditioner and international liquid surface conditioner, but CS100 liquid surface conditioner can form fine film after pickling in low zinc phosphating, which is better than domestic solid surface conditioner and international liquid surface conditioner.