It has become an important task to eliminate the chromate chemical transformation of metal surface and develop its replacement technology.

 

By Guo Ruiguang xian building university of science and technology, GengZhiLiang, Yang jie invented by aluminium alloy liquid surface temperature fast film forming and the method of use, and its aim is to provide a contains no hexavalent chromium and easily under the condition of the rapid chemical film-forming liquid film of aluminum alloy, the surface is easy to form excellent anticorrosion and adhesion performance, even color conversion film.

 

The invention discloses a rapid film-forming liquid on the surface of aluminum alloy at room temperature and a method for its use. The formula of the film-forming liquid contains silicate, titanium salt, peroxide, fluoride and metal trivalent salt. The pH value of the solution is from 1 to 9, and the temperature of the solution is from 1 to 40℃. The temperature is controlled at 1 ~ 40℃, the pH is 2 ~ 8, and the contact time with aluminum alloy is 1 ~ 10 minutes. Because the invention does not contain six chromium valence and potassium ferricyanate, not only the pollution to the environment is greatly reduced; The invention because of the addition of trivalent metal salt, they easily precipitation properties of room temperature under the condition of in the aluminum alloy surface is easy to be needed for subsequent precipitation reaction conversion coating of heterogeneous nucleation of crystal seed, so as to accelerate the formation of conversion coating speed, save time and energy, industrial production to reduce the production cost, satisfy the requirement of industrial large-scale continuous production. The solution of the invention is stable and easy to form a film, and the formed conversion film has excellent corrosion resistance and adhesion performance.