General bonderite used before spray coating of steel and aluminum combined shell body, and preparation method of general bonderite

Abstract

The invention discloses general bonderite which is used before spray coating of a steel and aluminum combined shell body and by which phosphating films can be generated on the surfaces of steel and aluminum at the same time, and a preparation method of the general bonderite. The general bonderite is prepared by mixing a main agent, an additive No.1 and an additive No.2; the mass ratio of the main agent, the additive No.1 to the additive No.2 is 100:(3-8):(13-19); the main agent is prepared from the following raw materials in percentage by mass: 8 to 20 percent of phosphoric acid, 1 to 3 percent of room-temperature steel surface treatment agent, 0.5 to 2 percent of zinc oxide, 0.1 to 0.3 percent of 35 percent hydrogen peroxide, 0.6 to 2 percent of over 38 percent manganese carbonate, 2 to 4 percent of sodium carbonate, 4 to 7 percent of nickel nitrate of which Ni content is 20 percent, 0.1 to 0.2 percent of ferric nitrate and the balance of water; the additive No.1 is prepared from the following raw materials in percentage by mass: 40 to 70 percent of 40 percent silicofluoric acid, 3 to 5 percent of 50 percent hydrofluoric acid and the balance of water; and the additive No.2 is prepared from the following raw materials in percentage by mass: 30 to 70 percent of sodium nitrate and the balance of water.

Description

technical field [0001] The invention relates to a general-purpose phosphating agent before metal spraying and a preparation method thereof, in particular to a steel-aluminum combined shell capable of simultaneously forming a phosphating film layer firmly combined with a metal substrate on the surfaces of steel and aluminum Universal phosphating agent before spraying and coating of projectiles and its preparation method. Background technique [0002] Before the metal is sprayed and painted, its surface must be converted to make it form a conversion film. The conversion film is porous, uniform and fine, and the coating penetrates into the pores to effectively increase the adhesion of the sprayed coating, thereby improving the corrosion resistance of the metal. The conversion film includes phosphating film, passivation film, organic film, rare earth conversion film and sol silane film, etc. The phosphating film is made by immersing metal parts into specific acid phosphates con...

AI Technical Summary

Problems solved by technology

Continuing to use the original iron and steel phosphating agent will not be able to form a phosphating film on the surface of the hard aluminum alloy LY-12 that meets the technical requirements of the People's Republic of China Weapons Industry Standard (WJ536-2007)