Normal-temperature phosphating solution and method for preparing same

Abstract

The invention provides a normal-temperature phosphating solution and a method for preparing the same. The normal-temperature phosphating solution is mainly made from materials of hydroxylamine sulphate, phosphoric acid, sodium dihydrogen phosphate, fatty alcohol polyoxyethylene ether, cerous nitrate, zinc oxide, manganese phosphate and water. The preparation technology is simple and practicable, and the operation is convenient. The normal-temperature phosphating solution has competences of rust and oil fouling removing, and economizes the whole phosphating process by being combined with a sand blasting process; phosphating film after phosphating process has good anti-crazing, deformation resistant and shock resistant competences and a good combining capacity with an organic coating, and the phosphating film is a good base layer for the coating; and the normal temperature during a phosphating process is operable, the phosphating time is short, and the effect is good.

Description

Technical field [0001] The invention relates to a normal temperature phosphating solution and a preparation method thereof. Background technique [0002] Phosphating is to treat steel workpieces in a solution containing phosphate, oxidation promoters, and additives to form a phosphating film on the surface. The phosphating film has the functions of anti-corrosion, abrasion resistance, improving coating adhesion, lubrication and the like. Phosphating treatment is performed on the surface of steel. The traditionally used 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 more difficult for some small and medium-sized enterprises to carry out medium and high temperature phosphating. With the progress of phosphating technology, modern phosphating treatment is mainly developing towards low temperature, rapid formation of thin and good protective phosphate film. [000...

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