Preparation and application of neutral non-phosphorus rust remover

Abstract

The invention discloses preparation and application of a neutral non-phosphorus rust remover. The rust remover mainly comprises a chelating agent, a polymer, a corrosion inhibitor, a penetrant, a pH regulator, water and an assistant, and can be applied to phosphorization, chromizing and silanization of coating pretreatment of steel and iron workpieces or zirconium pretreatment and rusty workpiece derusting procedure before chemical conversion coating treatment. According to the rust remover, treatment time is flexible, the rust remover is utilized at the normal temperature, does not need to be heated, can be utilized for treatment in a spraying or impregnation manner, does not contain hazardous substances like phosphorus, and is low in residues and free of scales, after rust removing, a solution is low in bubble and scale, maintenance of a bath solution is simplified, residues and scales are not liable to adhere to the workpieces and pollute the workpieces, the pH of a treating fluid is neutral, workpiece matrixes and operation equipment are not corroded and damaged, the workpieces have good corrosion inhibition and rust protection performance after treatment, and the rust protection problem of the workpieces during the transfer process is solved.

Description

technical field [0001] The invention relates to a treatment technology for steel surface protection, in particular to the preparation and application of a neutral phosphorus-free rust remover. [0002] technical background [0003] Steel is the most widely used metal material in various fields in the world. During its manufacture, production, processing and use, it will inevitably cause damage and corrosion in different degrees and forms due to the influence of surrounding environmental media, resulting in economical The losses are countless. [0004] In coating production, removing rust on the surface of steel workpieces is a necessary process in the pre-coating process. Conventional mechanical rust removal (grinding, sandblasting, etc.) has high labor intensity and dust pollution, making it difficult to carry out large-scale flow operations; while traditional strong acid (hydrochloric acid, sulfuric acid, etc.) Equipment, health and the environment pose great hazards. Ne...

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Problems solved by technology

Conventional mechanical rust removal (grinding, sandblasting, etc.) has high labor intensity and dust pollution, making it difficult to carry out large-scale flow operations; while traditional strong acid (hydrochloric acid, sulfuric acid, etc.) Equipment, health and the environment pose a great hazard

Neutral rust remover is a kind of novel chemical rust remover material at present, as CN03146767, CN201410171064, CN201510579235, CN201611179917, neutral rust remover described in multiple patents such as CN201611080234, has adopted inorganic phosphate or organic phosphonic acid compound ( Such as hydroxyethylidene diphosphonic acid, aminotrimethylene phosphonic acid, etc.), although the purpose of neutral rust removal has also been achieved, there is still a certain degree of inter-process rust prevention after the workpiece is processed, and its treatment solution contains phosphorus. The waste water still needs to be further treated; as described in patents such as CN201310646506 and CN201510053544, the neutral phosphorus-free rust preventive agent is likely to generate a large amount of foam in the spray treatment process and even overflow the production equipment due to the surfactant used, and the foam is easy to induce rust removal The generated slag is entrained, causing secondary adhesion to pollute the workpiece and affecting subsequent production

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