A rust remover and its preparation method - inorganic acid ammonium hydrogen fluoride
Background technology
Rust removal is an important process in the processing of metal workpieces. Currently, hydrochloric acid and sulfuric acid are generally used for rust removal. Although rust removal is convenient and effective, a large amount of acid mist is usually generated during the rust removal process, which not only corrodes workshop equipment and workpieces, but also pollutes the environment, endangers the health of operators, and has special requirements for packaging materials, transportation vehicles, and storage sites. In addition, most current rust removal agents inevitably use hydrochloric acid or sulfuric acid, which inevitably generates smoke during storage, preparation, or use, causing environmental pollution or corrosion to equipment.
summary of the invention
The purpose of the present invention is to provide a novel rust remover and its preparation method in response to the shortcomings of existing rust removers.
The technical solution of the present invention is as follows:
A rust remover comprising the following components by mass percentage: organic acid 60-80%, inorganic acid 19-39%, corrosion inhibitor 0.8-3%; Preferably, organic acids account for 60-70%, inorganic acids account for 29-39%, and corrosion inhibitors account for 1-2%; More preferably, organic acids range from 62% to 70%, inorganic acids range from 31% to 37%, and corrosion inhibitors range from 1% to 1.5%;
The organic acids described are one or more of tartaric acid, citric acid, oxalic acid, and trichloroacetic acid; The inorganic acid is one or more of amino sulfonic acid, phosphite, or ammonium bifluoride; The corrosion inhibitors described are benzotriazole or/and sodium dihydrogen phosphate.
It is worth noting that although ammonium bifluoride does not belong to inorganic acids according to strict classification, due to the strong acidity of its aqueous solution, for the convenience of description, the present invention summarizes it into the category of inorganic acids.
Furthermore, the organic acid is preferably one of tartaric acid, citric acid, oxalic acid, or trichloroacetic acid, and further preferably one of tartaric acid, citric acid, or oxalic acid; The preferred inorganic acid is one of amino sulfonic acid, phosphite, or ammonium bifluoride, further preferably amino sulfonic acid or phosphite; The preferred corrosion inhibitor is benzotriazole or sodium dihydrogen phosphate.
The preparation method of the above-mentioned rust remover is to weigh each component in proportion, mix it, and stir evenly.
The rust remover of the present invention has a solid appearance, stable properties, and can be stored for a long time; The raw materials used are weakly acidic and do not produce acid mist or excessive corrosion; Fast rust removal speed to ensure rust removal efficiency. The main function of organic acids in the present invention is to react with FeO, Fe2O3, and Fe3O4 in rust. Inorganic acids are used as additives to enhance total acidity and accelerate rust removal. The addition of corrosion inhibitors can delay the rust return rate of the workpiece after rust removal.
The beneficial effects of the present invention are:
(1) The present invention completely avoids the use of hydrochloric acid or sulfuric acid, not only does it have no acid mist during rust removal, but it also does not corrode workshop equipment, improving the working environment; At the same time, the rust remover of the present invention has weak acidity and will not cause excessive corrosion to the workpiece, nor will it severely corrode the skin of the operator; After processing a certain amount of workpieces, the rust removal efficiency decreases. Continuing to add the rust removal agent of the present invention can restore the rust removal efficiency, that is, the rust removal tank liquid of the present invention can be conveniently reused.
(2) The ingredients and preparation methods of the present invention are very simple, easy to control and operate.
(3) The rust removal agent of the present invention has a very good rust removal effect, and the metal workpiece after rust removal does not change color, has no hanging ash, and has no hydrogen embrittlement; At the same time, the rust remover of the present invention is easy to package, transport, and store, and there is no risk factor such as leakage.
Specific implementation methods
The following will provide further explanation of the present invention in conjunction with specific embodiments, but the present invention is not limited to this. The following percentages all represent mass percentages.
Example 1
A rust remover composed of 60% tartaric acid, 39% amino sulfonic acid, and 1% benzotriazole.
Example 2
A rust remover composed of 65% oxalic acid, 34% amino sulfonic acid, and 1% benzotriazole.
Example 3
A rust remover composed of 62% citric acid, 37% amino sulfonic acid, and 1% benzotriazole.
Example 4
A rust remover composed of 66% trichloroacetic acid, 32.5% amino sulfonic acid, and 1.5% benzotriazole.
Example 5
A rust remover composed of 70% citric acid, 29% amino sulfonic acid, and 1% sodium dihydrogen phosphate.
Example 6
A rust remover composed of 68% tartaric acid, 30% ammonium bifluoride, and 2% sodium dihydrogen phosphate.
Example 7
A rust remover composed of 80% tartaric acid, 19.2% phosphite, and 0.8% sodium dihydrogen phosphate.
Example 8
A rust remover composed of 61% oxalic acid, 37.8% phosphite, and 0.8% sodium dihydrogen phosphate.
Example 9
A rust remover composed of 63% oxalic acid, 34% ammonium bifluoride, and 3% benzotriazole.
The preparation method is to mix the components in the above embodiments in proportion and stir evenly to obtain the corresponding rust remover in the corresponding embodiments.
The rust remover obtained from the above embodiments is used for rust removal of workpieces, with high rust removal efficiency. The rust removal process of general workpieces can be completed in a few minutes, and the metal workpieces after rust removal do not change color, have no hanging ash, and have no hydrogen embrittlement.
The applicant declares that the technical solution of the present invention is illustrated through the above embodiments, rather than limiting it. Ordinary technical personnel in this field should understand that if, inspired by the invention, equivalent replacement or similar modification is made to the scheme, and similar embodiments are designed without creativity, they should all fall within the scope of protection of the present invention.
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