Preparation method of neutral cleaning agent for rust removal of metal surfaces

Abstract

The invention discloses a preparation method of a neutral cleaning agent for rust removal of metal surfaces. The cleaning agent is characterized in that a liquid A is prepared from 52-56% of ethyl alcohol, 42-46% of phosphoric acid and 1-3% of oleic acid-based imidazoline; a liquid B is prepared from 83-87% of water, 1-3.0% of cyclohexanediamine tetraaceticacid, 3-6% of glycine betaine and 8-12% of glucosamine; a liquid C is prepared from 62-66% of water, 24-28% of tri-isopropanolamine and 8-12% of a water-soluble defoaming agent; in a reactor, the liquid A, the liquid B and the liquid C are stirred for 2 hours according to a volume proportion of 1:1:1 at the rotation speed of 200 turns per min, and then the neutral cleaning agent for rust removal of the metal surfaces is obtained. The pHvalue of the cleaning agent is within the range from 6.0 to 7.5; a dust removal agent and a waste liquid generated after cleaning are both neutral, acid mist cannot be generated, iron and steel structures cannot be corroded, and meanwhile, the cleaning agent has corrosion resistance and is capable of preventing secondary corrosion, safe and environmentally friendly during use and suitable for popularization.

Description

technical field [0001] The invention relates to the field of metal surface cleaning, in particular to a preparation method and application of a neutral metal surface rust-removing cleaning agent. Background technique [0002] During the use of metal, many metal materials will cause corrosion on the surface with the prolongation of use time, and once rust occurs, it is very prone to weathering, which will greatly reduce the performance of metal materials, and the rusted metal has metal corrosion. The superficial layer often renders the entire metal unusable. Rust is a chemical reaction. When iron is left for a long time, it will rust. When the oxygen in the air dissolves in the water, the oxygen reacts with the iron in the environment with water, and it will produce iron oxide, which is rust. Rust is a brownish-red substance. It is easy to fall off. After a piece of iron is completely rusted, its volume can expand by 8 times. If the rust is not removed, the spongy rust is ...

AI Technical Summary

Problems solved by technology

However, in practical applications, either due to the high price of raw materials and high cost; or due to incomplete degreasing and rust removal, the corrosion resistance performance, especially the long-term corrosion resistance performance is poor; or the complex composition is not conducive to the stable control of the bath; During the process, a large amount of acid mist is generated, and the product contains strong acid, strong alkali, heavy metal salt, fluoride and other toxic substances, which endanger the health of equipment and operators, so the application has obvious limitations

[0003] At present, there are mainly two types of rust removal methods: mechanical method and chemical method. The mechanical method is manually knocked, shoveled and polished. The disadvantages are high labor intensity, low efficiency, serious dust pollution, and difficult to remove rust. , high efficiency, simple process operation and low cost; however, conventional chemical treatment rust removers are acidic, and while cleaning and removing rust, they will also cause dissolution on the metal surface and cause new corrosion. Therefore, in the use of conventional When using an acidic rust remover, it is generally necessary to use it together with a corrosion inhibitor, which is not only troublesome to use and operate, but also increases the cost, and the discharge of the cleaning solution after rust removal will also cause environmental pollution