Method for preparing metal surface conditioner

Abstract

The invention discloses a method for preparing a metal surface conditioner. The method comprises the following steps: uniformly mixing 1-5 mass parts of titanium dioxide with 5-10 mass parts of soda ash; adding 2-5 mass parts of caustic soda flakes and 1-3 mass parts of water into the obtained mixture, then continuously stirring the obtained product until the obtained product is in a pasty state; slowly adding 10-20 mass parts of phosphoric acids into the pasty mixture while stirring, then continuing to stir the obtained object and keeping the obtained object at a temperature of 80-95 DEG C; and adding 6-10 mass parts of sodium tripolyphosphate into the obtained object in batches, continuously stirring the obtained material until the material is in a powdered state (the material is gradually changed into a pasty material, a semisolid material, and a powdered material finally from a liquid material, at this moment, the material is a semi-finished product), and after the powdered material is cooled, uniformly mixing the powdered material with 20-40 mass parts of sodium tripolyphosphate and 1-5 mass parts of EDTA (ethylene diamine tetraacetic acids), then carrying out smashing on the obtained mixture so as to obtain the metal surface conditioner. By using the surface conditioner prepared by using the technical scheme in the invention, the phosphating temperature can be reduced to below 4 DEG C; and meanwhile, the surface conditioner is better in stability and longer in slot-replacing cycle.

Description

technical field [0001] The invention relates to a metal surface regulating activator used in metal surface phosphating treatment technology, in particular to a preparation method of the metal surface regulating agent. Background technique [0002] The use of surface regulators in the phosphating of steel and zinc can reduce the temperature required by the phosphating process from medium temperature (70-80°C) to low temperature (about 40°C), and greatly improve the quality of the phosphating film. However, as environmental protection requirements become more and more stringent and energy prices rise, the phosphating process is required to gradually develop towards normal temperature, and the main means of this is to rely on continuous improvement of the surface conditioning quality to achieve this goal. Through the continuous efforts of scientific and technical personnel, the phosphating process has been able to be controlled below 20 °C. However, with the improvement of the...

AI Technical Summary

Problems solved by technology

However, with the improvement of the quality of the surface conditioner and the progress of the phosphating process, it becomes more and more difficult to further reduce the phosphating temperature.

[0003] Ordinary surface regulators have a certain limit to the acceleration of phosphating reaction. Generally, when the water temperature is lower than 15°C, the phosphating reaction will be difficult to proceed or the reaction speed will be very slow and lose its use value. Some companies even use oxalic acid as a surface regulator. , the quality of phosphating is even more difficult to guarantee. The water temperature in most parts of the country is relatively low in winter. If you use ordinary surface adjustment, you have to take heating measures in the phosphating process, otherwise the production will be difficult to guarantee.

In addition, ordinary surface conditioners are generally less stable, and their aqueous solutions will settle after standing overnight. completely lost

The service life of ordinary surface conditioner tank solution is generally 5 to 10 days. At that time, the effect of surface conditioner will be very poor. Even if the surface conditioner is added, the effect will not be much improved. At this time, all of them have to be replaced and re-prepared. groove

The main reason for the above defects is that the activity of colloidal titanium phosphate, which plays a major role in the surface conditioner, is not high, and the number of crystal nuclei generated on the steel surface is not large enough, thus limiting the promotion of phosphating reaction

[0004] Colloidal titanium phosphate plays the main role in the surface regulator. As long as different titanium-containing compounds can be synthesized into colloidal titanium phosphate, they will have a certain surface-regulating effect, but the effect will vary greatly; also for the same titanium-containing compound. Colloidal titanium phosphate is synthesized using different methods, but their epiregulation effects will also vary