Neutral environmental-friendly type rust removal liquid

Abstract

The invention relates to neutral environmental-friendly type rust removal liquid and belongs to the technical field of metal surface treatment. A rust remover in the rust removal liquid comprises, by mass, 5-15% of 2,3-dihydrobutanedioic acid, 5-15% of cocoanut fatty acid diethanolamide, 3.5-13.5% of phenol alkylphenol ethoxylates, 40-60% of sodium tetra sulfonate, 5-15% of sodium carbonate decahydrate, 0.5-2% of acetic acid and 5-15% of sodium bicarbonate. After water is added for mixing, the dust remover accounts for 15-25% of the total volume of the rust removal liquid. The environmental-friendly type rust removal liquid with the pH value being 6.5-6.8 is neutral, has good permeability and generates the contact foaming effect on an object. Therefore, when the rust removal liquid is used for cleaning and rust removal, the permeating foaming effect on rust and scale cinder on the surface of a black metal workpiece is achieved, so that the rust and the scale cinder are peeled off physically and sink at the bottom of a rust removal liquid storage tank; and therefore the rust removal effect is good, the cleaning and rust removal capacities can be lasted, and the service life is long.

Description

technical field [0001] The invention relates to a rust removing liquid, in particular to a neutral and environment-friendly rust removing liquid, which belongs to the technical field of metal surface treatment. Background technique [0002] Rust removal is an important process of metal surface treatment, and its main method is to remove metal surface oxides by pickling. The descaling solution in the prior art is obviously acidic because it mainly adopts inorganic acid, and the discharge and treatment of its waste liquid is difficult, which is not conducive to environmental protection. Although neutral derusting fluids continue to emerge, they all have certain limitations. [0003] For example, the Chinese patent that the application number is 200710029019.9 discloses a multifunctional environment-friendly metal degreasing, rust-removing and rust-preventing liquid, which is special in that it comprises the following components: polyoxyethylene alkyl ether, sodium lauryl sulf...

AI Technical Summary

Problems solved by technology

However, this kind of organic acid not only has limited rust removal effect, but is not suitable for metal surface treatment with serious corrosion; and the number of times it can be recycled is limited, that is, the service life is short

In order to ensure the use effect, it needs to be replaced frequently, which is very inconvenient and increases the operating cost

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