Microcrystalline phosphating solution for brake block hardware

Abstract

The invention provides a pollution-free microcrystalline phosphating treatment solution for brake pad hardware, which is mainly made from the following raw materials in portion by weight: 40 to 50 portions of zinc nitrate, 22 to 30 portions of zinc dihydrogen phosphate, 30 to 40 portions of Mazhev salt (manganous dihydrogen phosphate), 1.5 to 2 portions of guanidine nitrate, 1.5 to 2 portions of sodium m-nitrobenzene sulfonate, 1 to 2 portions of sodium tripolyphosphate, 2 to 4 portions of tartaric acid, 2 to 3 portions of sulfosalicylic acid, 1.5 to 2.5 portions of citric acid and 1,000 to 1,200 portions of water. The solution is used for the blackening-phosphating treatment of the surface of iron hardware, and has the characteristics of fast phosphorization, good performances, little environmental pollution, low cost, etc. The treatment solution has the advantages of fine phosphatized crystals of phosphating films, uniform color in consistent black and good corrosion resistance. Especially, as the treatment solution chooses the raw materials with little environmental pollution and high efficiency, the treatment solution acquires excellent effects in both phosphatization and environmental protection through optimized combination and reasonable proportioning.

Description

Technical field

[0001] The invention involves phosphate treatment liquid, especially the microcrystalline phosphate processing solution that involves a hardcore -made brake pads. Background technique

[0002] Hardware of the brake pads is a common iron accessory in the brake pads. At present, the surface treatment of the hardware of the brake pads has been widely phosphoryized.After the surface of the brake pads, it has better corrosion resistance.However, the existing phosphorurative treatment liquid contains many harmful ingredients, such as nitrite, heavy metal nickel.These substances are very easy to pollute the environment and have a carcinogenic effect on the human body.On the other hand, in the existing public phosphorus formula, the black phosphorization treatment of small hardware can be used to achieve rapid response, good surface quality, and environmentally friendly phosphorus fluids are almost rare.For example, a Chinese patent application CN1807684 is a kind of int...