Rust remover and preparation method and application thereof

Abstract

The invention provides a rust remover and a preparation method and application thereof. The rust remover comprises the following components in percent by mass: 15-30% of phosphoric acid, 1-10% of hypophosphorous acid, 0.1-5% of sodium salt, 0.1-5% of a compound surfactant and the balance water. The compound surfactant comprises alkylphenol ethoxylates, isomeric alcohol ethoxylate and nitric acid.The rust remover can remove rust efficiently and quickly, is high in rust removal efficiency, short in rust removal time and simple in application method and corrodes a matrix material lightly, and the glossiness of the surface of a product after rust removal is high.

Description

technical field [0001] The invention belongs to the technical field of iron and steel rust removal, and in particular relates to a rust remover and its preparation method and application. Background technique [0002] At present, the rust removal of steel products is mainly hydrochloric acid pickling. Traditional chemical rust removal usually uses strong acid, which can chemically react with rust and metal oxides to generate soluble salts, so as to achieve the purpose of rust removal. While removing rust, the acid can react with the base metal to release hydrogen, hydrogen It can exert pressure on rust and insoluble scale, which is beneficial to their peeling and reduction of high-valent iron, and accelerates the pickling process. However, the traditional acid solution treatment method also has obvious defects. During the pickling process, irritating and corrosive acid gas will be produced; the acid solution will fail due to the rapid increase of iron ions, and waste acid w...

AI Technical Summary

Problems solved by technology

Exhaust gas, waste liquid, and waste pickling water have caused serious pollution in pickling and rust removal, which is increasingly restricted under the current high pressure of environmental protection

At present, the existing environmentally friendly phosphoric acid rust remover has a very low rust removal efficiency. In order to accelerate the rust removal efficiency, it is necessary to add long-term ultrasonic waves or heat to a high temperature of 50°C, which not only consumes high energy, but also prolongs the treatment time. certain corrosion

[0003] CN105018947A discloses a rust remover, which is made of 17-25% citric acid, 0.5-10% oxalic acid, 15-45% phosphoric acid, 0.5-2% sodium alkylbenzenesulfonate, 0.5-4% emulsified Composed of corrosion inhibitor, 3.5-5.5% corrosion inhibitor and the rest of deionized water, the rust remover has a good rust removal effect on light rust, but it takes a long time to treat scales with heavy rust, and it is easy to Rusty parts damage its surface

This invention will not cause corrosion or other damage to steel, and can eliminate rust on steel. However, to accelerate the efficiency of rust removal, it is necessary to add a long time of ultrasonic or heating to a high temperature of 50°C, which not only consumes high energy, but also prolongs the treatment time. Corrosion to the metal surface

Images