Phosphating solution and preparation method thereof

Abstract

The invention aims to provide a phosphating solution and a preparation method thereof. The phosphating solution is mainly prepared from hydroxylamine sulphate, phosphoric acid, sodium dihydrogen phosphate, fatty alcohol-polyoxyethylene ether, cerous nitrate, zinc oxide, manganese phosphate and water. The preparation technology is simple, feasible and easy to operate. The phosphating solution provided by the invention has certain capability of removing rusts and oil dirt; by a sand blasting treatment technology, an overall phosphating working procedure is saved; a phosphated film generated after phosphating treatment is high in cracking resistance, deformation resistance and impact resistance, can be well combined with an organic coating film and is a high-quality bottom layer for film coating; a phosphating process can be executed at normal temperature; the phosphating time is short; and the phosphating effect is good.

Description

technical field [0001] The invention relates to a phosphating solution and a preparation method thereof. Background technique [0002] Phosphating is to treat steel workpieces in a solution containing phosphate, oxidation accelerators, and additives to form a phosphating film on the surface. The phosphating film has the functions of anti-corrosion, wear-resistant, improving coating adhesion, and lubricating. For phosphating treatment on the surface of steel, the traditional phosphating solution has high temperature, high energy consumption, long time and high cost. Especially for large workpieces such as automobile chassis and parts, it is difficult for some small and medium-sized enterprises to carry out medium and high temperature phosphating. With the advancement of phosphating technology, modern phosphating treatment is mainly developed towards low temperature, rapid formation of thin and good protective performance phosphate film. [0003] One situation in the prior ...

AI Technical Summary

Problems solved by technology

Because the components of the phosphating solution are too simple, there are certain defects in the quality of the phosphating film formed, which directly affects the quality of subsequent processed products.

[0004] Patent No. ZL200710039973.6, the Chinese invention patent titled "Phosphating Method Using Ozone as a Phosphating Accelerator for Iron and Steel", discloses a phosphating method using ozone as a phosphating accelerator, but in this method, the workpiece is The immersion time in the solution still needs more than 15 minutes, and it needs to be immersed in 0.01mol / L phenylene diphosphate diester solution for 50 minutes to make the copper sulfate spot corrosion test result be 419S

Therefore, the phosphating method is time-consuming and ineffective

[0005] The application number is 200410094007.0, and the Chinese invention patent application publication titled "Phosphating Treatment Solution for Surface of Metal Components" discloses a phosphating method using hydrogen peroxide as a phosphating accelerator, but this method is difficult to stabilize the phosphating solution The concentration of hydrogen peroxide in the medium, and easy to produce phosphating sediment

[0006] In the prior art, sodium nitrite or sodium chlorate is commonly used as an accelerator in phosphating solution. The disadvantage of the former is that it is unstable in acidic phosphating solution and easy to decompose. If the content in the phosphating solution is not well controlled, it will greatly affect Phosphating effect; the latter will be reduced to chloride ions, which will accumulate in the bath. If the subsequent washing is not sufficient, the chloride ions will remain on the workpiece, which will cause great trouble

On the one hand, it pollutes the electrophoresis bath, and on the other hand, it stays under the coating, which will accelerate the corrosion rate